POWER AND INDUSTRIAL PLANT ENGINEERING PDF

POWER AND INDUSTRIAL PLANT ENGINEERING I. FAMILIARIZE THE FOLLOWING ELEMENTS A vertical turbine pump with the jump and motor closed coupled and design to be installed underground, as in the case of a deepwell pump. A. Horizontal split case pump B. Booster pump C. Submersible pump D. Vertic...

POWER AND INDUSTRIAL PLANT ENGINEERING I. FAMILIARIZE THE FOLLOWING ELEMENTS A vertical turbine pump with the jump and motor closed coupled and design to be installed underground, as in the case of a deepwell pump. A. Horizontal split case pump B. Booster pump C. Submersible pump D. Vertical shaft turbines pump Answer: C An underground formation that contains sufficient saturated permeable material to yield significant quantities of water. A. Aquifer C. Wet pit B. Ground water D. Well water Answer: A A timber, concrete or masonry enclosure having a screened inlet kept partially filled with water by an open body of water such as pond, lake, or steams. A. Aquifer C. Wet pit B. Ground water D. Well water Answer: C Water which is available from well, driven into water bearing subsurface strata (aquifer) A. Aquifer C. Wet pit B. Ground water D. Well water Answer: B Imparts velocity to the liquid, resulting from centrifugal force as the impeller is rotated. A. Impeller C. Casing B. Stuffing box D. Shaft sleeve Answer: A A means of throttling the leakage which would otherwise occur at the point of entry of the shaft into the casing. A. Impeller C. Casing B. Stuffing box D. Shaft sleeve Answer: B Protect the shaft where it passes through the stuffing box. A. Impeller C. Casing B. Stuffing box D. Shaft sleeve Answer: D The ratio of the actual vapor density to the vapor density at saturation A. Relative humidity C. Humidity ratio B. Absolute humidity D. Saturation ratio Answer: A An expression of the mass of water vapor per unit mass of dry air A. Relative humidity C. Humidity ratio B. Absolute humidity D. Saturation ratio Answer: C Which of the following is equivalent to 1lb? A. 5000 grains C. 7000 grains B. 6000 grains D. 8000 grains Answer: C The bypass factor for large commercial units A. Around 20% C. Around 10% B. Around 30% D. Around 50% Answer: C Sometimes called specific humidity A. Relative humidity C. Humidity ratio B. Absolute humidity D. Saturation ratio Answer: C For any given barometric pressure, the humidity ratio is a function of the A. Critical temperature C. Dry bulb temperature B. Dew point temperature D. Wet bulb temperature Answer: B The humidity ratio corresponding to any given dew point temperature varies with the total barometric pressure, increasing as the barometric pressure A. Increases C. Varies B. Decreases D. Constant Answer: B The ratio of the mass of water vapor in the air per unit mass of dry to the mass of water vapor requires for saturation of the same air sample A. Relative humidity C. Humidity ratio B. Absolute humidity D. Saturation ratio Answer: D A closed channel excavated through an obstruction such as a ridge of higher land between the dam and the powerhouse is called A. Canal C. Penstock B. Headrace D. Tunnel Answer: D The small reservoir in which the water level rises or falls to reduce the pressure swings so that they are not transmitted to the closed conduit is called A. Penstock C. Pressure tank B. Power reservoir D. Tunnel Answer: D The regulation of the water in the form of a relatively small pond of reservoir provided at the plant is called A. Pondage C. Reservoir B. Water storage D. Lake Answer: A A structure used to relieve the reservoir of excess water A. Spillway C. Butress dam B. Diversion channel D. Arch dam Answer: A The fluid pressure difference created by column of heated gas, as by7 chimney is called A. Natural draft C. Induce draft B. Forced draft D. Required draft Answer: A The pressure rise from greater to a lesser vacuum, created in a gas loop between stream generator outlet and chimney by means of a fan is called A. Forced draft C. Required draft B. Induced draft D. Balanced draft Answer: B Also known as Francis turbines or radial flow turbines A. Impulse turbines C. Reaction turbines B. Tangential turbines D. Axial flow turbines Answer: C The turbine, draft tube and all related parts comprise what is known as A. Powerhouse C. Setting B. Forbay D. Surge chamber Answer: C When a forbay is not part of the generating plant’s design, it will be desirable to provide a _________ in order to relieve the effects of rapid changes in flowrate. A. Forbay C. Surge chamber B. Draft tube D. Penstock Answer: C To keep the deflected jet out of the way of the incoming jet, the actual angle is limited to approximately A. 90 deg. C. 165 % B. 135 deg. D. 175 deg. Answer: C The minimum fluid energy required at the pump inlet for satisfactory operation is known as A. NPSHR C. Velocity head B. NPSHA D. Friction head Answer: A Throttling the input line to a pump and venting or evacuating the receiving tank A. Both increase cavitation B. Both decrease cavitation C. Both eliminate cavitation D. Both drive cavitation Answer: A Traditional reciprocating pumps with pistons and rods can be either single-acting or double acting and are suitable up to approximately A. 2000 psi C. 8000 psi B. 4000 psi D. 10,000 psi Answer: A In a sensible heating process the final humidity ratio is: A. Increased C. The same B. Decreased D. Cannot be determined Answer: C In an adiabatic saturation process the final relative humidity is: A. Increased C. The same B. Decreased D. Cannot be determined Answer: A Cooling and dehumidifying process is commonly used for: A. Summer air conditioning C. Winter cooling B. Ice making D. Heat pumping Answer: A An adiabatic saturation process is also known as: A. Constant WB temperature process B. Constant DB temperature process C. Constant DP temperature process D. Constant vapor temperature process Answer: A For efficient operation, the condensing temperature should not be lower than A. 5 C C. 10 C B. 17 C D. 20 C Answer: A For efficient operation, the condensing temperature should not be more than A. 5 C C. 10 C B. 17 C D. 20 C Answer: B The process of simultaneous heating and dehumidifying is known as: A. Sensible heating B. Cooling and dehumidifying C. Sensible cooling D. Chemical dehumidifying Answer: D The process in increasing the dry-bulb temperature without changing the humidity ratio is known as: A. Sensible heating B. Cooling and dehumidifying C. Sensible cooling D. Heating and dehumidifying Answer: A The process of simultaneous cooling and decreasing of humidity ratio is known as: A. Sensible cooling B. Cooling and humidifying C. Cooling and dehumidifying D. Heating and dehumidifying Answer: C The process of cooling without changing the humidity ratio is known as: A. Sensible heating B. Cooling and dehumidifying C. Sensible cooling D. Heating and humidifying Answer: C The process of simultaneous heating and humidifying ratio is known as: A. Sensible cooling B. Cooling and humidifying C. Heating and humidifying D. Heating and dehumidifying Answer: C Which of the following cycle is bulky and involves toxic fluids hence it is unsuitable for home and autocooling A. Carnot refrigeration cycle B. Absorption cycle C. Vapor and compression cycle D. Air refrigeration cycle Answer: B Which of the following refrigeration cycle is practical when large quantities of waste or inexpensive heat energy are available? A. Reciprocating compressors B. Centrifugal compressors C. Rotary compressors D. Scroll compressors Answer: D Condensers used in small and medium sized up to approximately 100 tons refrigerators. A. Air-cooled condensers C. High side condensers B. Water cooled condensers D. Low side condensers Answer: A An evaporator in a refrigeration unit makes use of which heat transfer modes? A. Conduction C. Radiation B. Convection D. All of the above Answer: D Energy added to a vapor is known as a latent heat of vaporization A. Latent heat of vaporization B. Sensible heat of vapor C. Superheat D. B and C Answer: C The vaporization process that occurs at temperature below the triple point of a substance is called. A. Evaporation C. Sublimation B. Boiling D. Condensation Answer: C As the pressure increases, the amount of work it can do increases and its enthalpy A. Increases B. Remained the same C. Decreases D. Pressure and enthalpy has no relation at all Answer: A During the compression process, the internal energy of the refrigerant vapor A. Increases B. Decreases C. Remain the same D. Internal energy has no relation to the compression process Answer: A The measure of the amount of thermal energy transfer occurring within the evaporator per unit mass under stated conditions. A. Refrigeration capacity C. Refrigeration effect B. Heat capacity D. Heat absorptivity Answer: C The peak power that can be produced on an occasional basis A. Brakepower C. Continous duty rating B. Intermittent rating D. Power rating Answer: B A value of a property that includes the effect of friction is known as: A. Brake value C. Friction value B. Indicated value D. Actual value Answer: A Forced draft fans are run at relatively high speeds in the range of A. 1200 to 1800 rpm C. 1000 to 1600 rpm B. 1500 to 2000 rpm D. 900 to 1500 rpm Answer: A Chimneys that rely on natural draft are sometimes referred to as A. Natural chimney C. Gravity chimney B. Normal chimney D. Stack Answer: C For realistic problems, the achievable stack effect probably should be considered to be A. 75% of the ideal C. 80 % of the ideal B. Equal to the ideal D. Half the ideal Answer: C In a balanced system, the available draft is A. Unity C. Zero B. 100 D. Infinite Answer: C It is a device used for atomizing or cracking fuel oil and through which the fuel oil is injected into the working cylinders of Diesel engines A. Atomizer C. Fuel spray nozzle B. Injector D. Cracker Answer: A The device that transfer thermal energy from one fluid to another A. Condenser C. Evaporator B. Feedwater D. Heat exchanger Answer: D Undergrounds system of hot water and / or steam A. Hydrothermal resource B. Geothermal resource C. Hot water resource D. High pressure water system Answer: A The process of returning spent geothermal fluids to the subsurface Is called A. Injection C. Rejection B. Returning D. Exhaustion Answer: A The simultaneous demand of all customers required at any specified point in an electric power system is called A. Demand C. Power demand B. Electrical demand D. Load Answer: D The electricity generating plants that are operated to meet the peak or maximum load on the system are called A. Peaking plants C. High demanding plants B. High-load plants D. Add-on plants Answer: A The capacity of a substance to transmit a fluid is called A. Fluidity C. Porosity B. Permeability D. Smoothness Answer: B The ratio of the aggregate volume pore spaces in rock or soil to its total volume is called A. Porosity C. Permeability B. Sphericity D. Salinity Answer: A Cooling efficiency is typically A. 75 to 80% C. 80 to 85% B. 50 to 70% D. 90 to 95% Answer: B Forced draft towers can cool the water to within A. 10 to12 F C. 20 to 24 F B. 5 to 6 F D. 2.5 to 3 F Answer: B The higher the wet bulb temperatures A. The higher the efficiency B. The lower the efficiency C. The efficiency is limited D. The efficiency is maximum Answer: B Define the relative difficulty in cooling, essentially the relative amount of contact area or fill volume required A. Heat load C. Cooling duty B. Tower load D. Rating factor Answer: D Evaporation loss can be calculated from the humidity ratio increase and is approximately _________ decrease in water temperature A. 0.18% per C C. 0.10% per C B. 0.25% per C D. 0.30% per C Answer: A Water lost in small droplet and carried away by the air flow A. Range C. Drift B. Approach D. Bleed-off Answer: C The ratio of total dissolved solids in the recirculating water to the total dissolved solids in the make-up water. A. Ratio of concentration B. Cooling efficiency C. Coil efficiency D. Bypass factor Answer: A A dry-cooling tower where steam travels through large diameter “trunks” to a cross-flow heat exchanger where it is condensed and cooled by the cooler air A. Direct condensing tower B. Indirect condensing dry cooling tower C. Evaporative cooling tower D. Atmospheric cooling tower Answer: A The minimum fluid energy required at the pump inlet for satisfactory operation is known as A. NPSHR C. Velocity head B. NPSHA D. Friction head Answer: A The actual fluid energy at the inlet A. NPSHR C. Velocity head B. NPSHA D. Friction head Answer: B Throttling the input line to a pump and venting or evacuating the receiver tank A. Both increase cavitation B. Both decrease cavitation C. Both eliminate cavitation D. Both drive cavitation Answer: A Traditional reciprocating pumps with pistons and rods can be either single-acting or double acting and are suitable up to approximately A. 2000 psi C. 8000 psi B. 4000 psi D. 10,000 psi Answer: A Plunger pumps are only single-acting and are suitable up to approximately A. 2000 psi C. 8000 psi B. 4000 psi D. 10,000 psi Answer: D The ratio of the actual to the ideal heat transfer coefficient. A. Fouling factor C. Cleanliness factor B. Sensible heat ratio D. Biot number Answer: C The ratio of the maximum to minimum mass steam flow rates at which the temperature can be accurately contained by the desuperheater. A. Cleanliness factor C. Turndown ratio B. Capacity factor D. Fouling factor Answer: C With a reversible regenerator, the thermal efficiency of the Ericsson cycle is ______ to that of the Carnot cyle A. Less than C. Proportional B. Greater than D. Equal Answer: D The electron magnetic radiation emitted from the daughter nucleus when an alpha particles leaves the patent atom A. Neutron C. Gamma ray B. Position D. K-capture Answer: C Which of the following statement is a scheme for energy storage? A. Pumped hydro C. Thermal energy storage B. Magnetic energy storage D. All of the above Answer: D A reactor that employs fast or high energy neutrons and contains no moderator is called A. High energy reactor C. High speed reactor B. Fast reactor D. Turbo reactor Answer: B A reactor that utilizes slow moving neutrons A. Slow reactor C. Thermal reactor B. Intermediate reactor D. Slow speed reactor Answer: C The water bearing stratum of permeable san, rock, or gravel is called A. Reservoir C. Aquifer B. Water source D. Well Answer: C The electricity generating units that are operated to meet the constant or minimum load on the system is called A. Constant load plants C. Invariable load plants B. Baseload plants D. Steady load plants Answer: B The effectiveness of a body as a thermal radiator at a given temperature, A. Absorptivity C. Emissivity B. Conductivity D. Reflectivity Answer: C What are the main components in a combined cycle power plant? A. Diesel engine and air compressor B. Steam boiler and turbine C. Gas engine and waste heat boiler D. Nuclear reactor and steam boiler Answer: C The size of a steam reciprocating pumps is generally designed by a three-digits number size as 646. The first digit designates A. Stroke of the pump in inches B. Inside diameter of the steam cylinder measured in inches C. Percent clearance D. Number of cylinder Answer: B The power required to deliver a given quantity of fluid against a given head with no losses in the pump is called A. Wheel power C. Hydraulic power B. Brake power D. Indicated power Answer: C Fluid that are pumped in processing work are frequently more viscous than water. Which of the following statement is correct? A. Reynolds number varies directly as the viscosity B. Efficiency of a pump increases as the viscosity increases C. Increased fluid friction between the pump parts and the passing fluid increases useful work D. Working head increases as the viscosity Answer: C The law that states “Entropy of all perfect crystalline solids is zero at absolute zero temperature” A. Zeroth law of thermodynamic B. First law of thermodynamics C. Second law of thermodynamics D. Third law of thermodynamics Answer: D An expression of the mass of water vapor per unit mass of dry air A. Relative humidity B. Absolute humidity C. Humidity ratio D. Saturation ratio Answer: C Which of the following is equivalent to 1 lb? A. 5000 grains C. 7000 grains B. 6000 grains D. 8000 grains Answer: C The locus of states that the same value of stagnation enthalpy and mass flux is called. A. Fanno line C. Willian’s line B. Reyleigh line D. Mollier’s line Answer: A Combining the conservation of mass and momentum equations into a single equation and plotting it on the h-s diagram yield a curve called A. Fanno line C. Willian’s line B. Reyleigh line D. Mollier’s line Answer: B Across the shock, the stagnation temperature of an ideal gas A. Increases C. Remains constant B. Decreases D. Proportional Answer: C Which of the following types of air dryers works by absorbing moisture on a solid dessicant or drying material such as activated alumina, silicon gel or molecular sieve? A. Regenerative dryer C. Deliquescent dryer B. Spray dryer D. Refrigerated dryer Answer: C When two bodies, isolated from other environment, are in thermal equilibrium with a third body, the two are in thermal equilibrium with each other. A. Zeroth law of thermodynamic B. First law of thermodynamics C. Second law of thermodynamics D. Third law of thermodynamics Answer: A The sum of the energies of all the molecules in a system where energies appear in several complex forms is the A. Kinetic energy C. Potential energy B. Internal energy D. Friction energy Answer: B The Carnot refrigeration cycle includes all of the following process except A. Isentropic expansion C. Isothermal expansion B. Isenthalpic expansion D. Isentropic compression Answer: B The maximum possible work that can be obtained a cycle operating between two reservoirs is found from A. Process irreversibility B. Carnot efficiency C. Availability D. Reversible work Answer: B The following factors are necessary to define a thermodynamic cycle expect A. The working substance B. High and low temperature reservoirs C. The time it takes to complete the cycle D. The means of doing work on the system Answer: C A temperature above which a given gas cannot be liquefied A. Cryogenic temperature B. Absolute temperature C. Vaporization temperature D. Critical temperature Answer: D The geometrical electricity generating plants that employs a closed-loop heat exchange system in which the heat of the primary fluid is transferred to a secondary fluid, which is thereby vaporized and used to drive a turbine generator set A. Binary cycle plant C. Double cycle plant B. Dual cycle plant D. Cascade cycle Answer: A The geothermal solution which contains appreciable amounts of sodium chloride or other salts is called A. Sulfur dioxide C. Sea water B. Potassium silicate D. Brine Answer: D The quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at standard conditions. A. Btu C. Joule B. Calorie D. Centigrade Answer: A The process that uses a stream of geothermal of hot water or stream to perform successive task requiring temp is called A. Diminishing heat B. Decreasing heat C. Cascading heat D. Negative gradient process Answer: C The water formed by condensation of steam is called A. Distilled water C. Dew B. Condensate D. Condenser Answer: B A structure that removes heat from condensate is called A. Desuperheater C. Evaporator B. Cooling tower D. Condenser Answer: B In a typical hydroelectric generating plant using reaction turbines, the turbine is generally housed in a A. Powerhouse C. Forbay B. Penstock D. Setting Answer: A After the water passes through the turbine, it is discharges through the draft tube to the receiving reservoir known as the A. Tail race C. Draft tube B. Tailwater D. Setting Answer: A The turbine, draft tube and all related parts comprise what is known as A. Powerhouse C. Setting B. Forbay D. Surge chamber Answer: C When a forbay is not part of the generating plant’s design, it will be desirable to provide a ________ in order to relieve the effects of rapid changes in flowrate. A. Forbay C. Surge chamber B. Draft tube D. Penstock Answer: C To keep the deflected jet out of the way of the incoming jet, the actual angle is limited to approximately A. 90 deg. C. 165% B. 135deg. D. 175deg. Answer: C The spontaneous vaporization of the fluid, resulting in a degradation of pump performance. A. Cavitation C. Available head B. Vapor lock D. Net head Answer: A A dry cooling tower where steam is condensed by cold water jets (surface or jet condenser) A. Direct condensing tower B. Indirect condensing dry cooling tower C. Evaporative cooling tower D. Atmospheric cooling tower Answer: B If the heat is being removed from water, the device is known as A. Chiller C. Air conditioner B. Cooler D. Air cooler Answer: A Which of the following is the refrigerant “of choice” in uniting air conditioners? A. R-22 C. R-11 B. R-123 D. R-502 Answer: A In new equipment, which of the following replace R-11? A. R-12 C. R-502 B. R-123 D. R-22 Answer: B The mass flow rate produces by the compressor is A. Proportional to the mass of the suction vapor that the compressor takes in at the suction inlet per unit time B. Equal to the mass of the suction vapor that the compressor takes in at the suction inlet per unit time C. Less than the mass of the suction vapor that the compressor takes in at the suction inlet per unit time D. Greater that the mass of the suction vapor that the compressor takes in at the suction inlet per unit time Answer: B A boiler operated at pressure not exceeding 1.055kg/cm2 gage steam, or water temperature no exceeding 121˚C. A. Low pressure heating boiler B. Hot water supply boiler C. Miniature D. Power boiler Answer: A The very hot steam that doesn’t occur with a liquid A. Pure steam C. Critical steam B. Saturated vapor D. Dry steam Answer: D The steam produced when the pressure on a geothermal liquid is reduced A. Low pressure steam C. Sub pressure steam B. High quality steam D. Flashed steam Answer: D The vent or hole in the Earth surface, usually in a volcanic region, from which, gaseous vapors, or hot gasses issue A. Fumaroles C. Hot spot B. Crater D. Hot spring Answer: A The earth interior heat made available to man by extracting it from hot water or rocks. A. Geological heat C. Volcanic heat B. Geothermal heat D. None of these Answer: B Device that takes advantage of the relatively constant temperature of the Earth’s interior, using it as a source and sink of heat for both heating and cooling. A. Geothermal devices C. Geothermal heat pumps B. Geothermal generator D. Geothermal turbines Answer: C The spring that shoots jets of hot water and steam into the air is called A. Geyser C. Thermal jet B. Hot jet D. Guyshen Answer: A What is the power seat width of a spray valve? A. 1/16 in. C. 1/8 in. B. 1/32 in. D. 1/4 in. Answer: A A device which automatically governs or controls the speed of an engine. A. Servomotor C. Governors B. Indicator D. Speedometer Answer: C The useful energy transfer in Btu/hr divided by input power in watts. This is just the coefficient of performance expressed in mixed units. A. Energy efficient ratio C. Bypass factor B. Coil efficient D. Sensible heat ratio Answer: A If EER is the energy efficiency ratio, and COP is the coefficient of performance then A. EER=3.41COP C. EERxCOP=3.41 B. COP=3.41EER D. 3.41EERxCOP=1 Answer: A Which of the following is a reversed Rankine vapor cycle? A. Carnot refrigeration cycle B. Vapor refrigeration cycle C. Air refrigeration cycle D. Absoption cycle Answer: B The most common type of refrigeration cycle, finding application in household refrigerators, air conditioners for cars and houses, chillers and so on. A. Carnot refrigeration cycle B. Vapor refrigeration cycle C. Air refrigeration cycle D. Absoption cycle Answer: B Which of the following is a reserved Brayton cycle? A. Carnot refrigeration cycle B. Vapor refrigeration cycle C. Air refrigeration cycle D. Absoption cycle Answer: C A 100kg is at 0˚C is heated by supplying 2000KJ of heat to it. If the heat of fusion is 335kJ/kg how many kilograms of ice will melt into water? A. 8 kg C. 6 kg B. 10 kg D. 3 kg Answer: C Determine the quantity of latent heat transferred to an evaporator when 5 kg of water undergoes those changes from a liquid at 0˚C to ice at 0˚C. A. 1,300 kJ C. 1,450 kJ B. 1,675 kJ D. 1,800 kJ Answer: B Compute the rate of water transfer by melting an ice at a rate of 50 kg/hr. A. 8 kJ/sec C. 5 kJ/sec B. 10 kJ/sec D. 12 kJ/sec Answer: C 10 kg of water at 60˚C receives 42,000kJ of heat coming from the surrounding. Assuming it is open to the atmosphere, how many kilograms of water will be vaporized? A. 18 kg C. 10 kg B. 15 kg D. 20 kg Answer: A As the liquid changes phase to vapor, its enthalpy A. Increases B. Decreases C. Remains constant D. Enthalpy has no relation to phase change Answer: A Which of the following processes does not alter the kinetic energy level of a substance? A. Fusion B. Adding sensible heat to a solid C. Adding sensible heat to a liquid D. Superheating a vapor Answer: A Condensers used for larger capacities refrigerators. A. Air-cooled condersers C. High side condensers B. Water-cooled condensers D. Low side condenser Answers: B Coolers and chillers for water generally operate with an average temperature difference of A. 3 to 11 C C. 6 to 22 C B. 5 to 8 C D. 10 to 16 C Answer: A To avoid freezing problems, entering refrigerant should be A. Below-2 C B. Above-2 C C. Equal to-2 C D. 0 C Answer: B Suction lines should not be sized too large, as reasonable velocity is needed to carry oil from the evaporator back to the compressor. For horizontal suction lines, the recommended minimum velocity is A. 3.8 m/s C. 7.1 m/s B. 6.1 m/s D. 4.8 m/s Answer: A Type of turbine used for low heads, high rotational speeds and larger flow rates A. Axial flow turbines C. Radial flow turbines B. Reaction turbines D. Impulse turbines Answer: A To keep the deflected jet out of the way of the incoming jet, the actual angle is limited to approximately A. 135 deg. C. 165 deg. B. 150 deg. D. 175 deg. Answer: C Which of the following turbines are centrifugal pumps operating in reverse? A. Reaction turbines C. Tangential turbines B. Impulse turbines D. Axial flow turbines Answer: A Weight per unit volume is termed as: A. Specific gravity C. Weight density B. Specific density D. Pressure Answer: C Measure of hotness or coldness of the body A. Pressure C. Energy B. Temperature D. Entropy Answer: B The temperature at which the water vapor in the air begins to condensed, or the temperature at which the relative humidity of air becomes 100%. A. Flash point C. Dew point B. Boiling point D. Freezing point Answer: C It consists of a wet and dry bulb thermometers mounted on a strip of metal A. Manometer C. Pyrometer B. Gyrometer D. Sling psychrometer Answer: D A manometer is an instrument that is used to measure: A. Air pressure C. Heat radiation B. Condensate water level D. Air volume Answer: A The relationship of water vapor in the air at the dew point temperature to the amount that should be in the air if the air were saturated at the dry-bulb temperature is: A. Partial pressure actual dew point B. Percentage humidity C. Relative humidity D. Run faster Answer: A All of the following statements about wet bulb temperature are true, EXCEPT A. Wet bulb temperature aequals adiabatic saturation temperature B. Wet bulb temperature is the only temperature necessary to determine grains water per lb of dry air C. Wet bulb temperature lies numerically between dew point and dry bulb temperature for unsaturated systems D. Wet bulb temperature equals both dry-bulb and dew point temperature at 100% relative humidity Answer: C Heat added to or removed from a substance that cause a change of temperature: A. Absolute heat C. Specific heat B. Latent heat D. Sensible heat Answer: D The ratio of the actual to the ideal heat transfer coefficient. A. Fouling factor B. Sensible heat ratio C. Cleanliness factor D. Biot number Answer: C The ratio of the maximum to minimum mass steam flow rates at which the temperature can be accurately contained by the desuperheater. A. Cleanliness factor C. Turndown ratio B. Capacity factor D. Fouling factor Answer: C Used to described the act of blowing the exhaust product out with the air-fuel mixture A. Supercharging C. Honing B. Scavenging D. Choking Answer: B A form of supercharging in which the exhaust gases drive the supercharger A. Lugging C. Turbocharging B. Honing D. Blower charging Answer: C The maximum speed of the turbine under no and no governing action is called A. Runaway speed B. Pre governing speed C. Governing speed D. No load governing Answer: A Which of the following statements is false when gasoline is used as diesel fuel. A. Gasoline does not ignite B. Gasoline wears the fuel-injection pumps because of its low viscosity C. Addition of lubrication oil to gasoline will just severe the situation D. All of the above Answer: C Which of the following is an advantage of hydro-plants? A. Hydro plants provide ancillary benefits like irrigation, flood control, aquaculture navigation etc. B. Modern hydro generators give high efficiency over considerable range of load. This helps in improving the system C. Due to its great ease of taking up and throwing off the load, the hydro power can be used as the ideal spinning reserve in a system mix of the thermal, hydro and power station D. All of the above Answer: B The hole area behind the dam draining into a stream or river across which dam has been constructed is called A. Lake C. Catchment area B. Forebay D. Reserve potential Answer: C Dams constructed primarily to store flood waters called A. Storage dams C. Detention dam B. Diversion dams D. None of the above Answer: C A channel which leads water to a turbine is called A. Canal C. Penstock B. Tailrace D. Headrace Answer: D Sometimes called percentage humidity A. Relative humidity C. Humidity ratio B. Absolute humidity D. Saturation ratio Answer: D When measuring ____________ of air, the bulb of the thermometer should be shaded to reduce the effect of direct radiation A. Dry bulb temperature C. Critical temperature B. Wet bulb temperature D. Saturation temperature Answer: A An ordinary thermometer whose bulb is enclosed in a wetted cloth sac or wick A. Dry bulb thermometer C. Ordinary thermometer B. Wet bulb thermometer D. Mercury thermometer Answer: B To obtain an accurate reading with a wet bulb thermometer, the wick should be saturated with A. Clean air C. Moist B. Vapor D. Clean water Answer: A The amount by which the wet bulb temperature is reduced below the dry bulb temperature depends on the relative humidity of the air and is collective A. Range C. Drify B. Approach D. Wet bulb depression Answer: D The measure of the relationship between the dry bulb and dewpoint temperature of the air and as such, it provides a convenient means of Dewpoint temperature of the air when the dry bulb temperature is known A. Wet bulb temperature C. Humidity ratio B. Saturation temperature D. Relative humidity Answer: A An index of the total heat (enthalpy) of the air A. Wet bulb temperature B. Saturation temperature C. Dry bulb temperature D. Dewpoint temperature Answer: A The sensible heat of the air is a function of the A. Wet bulb temperature B. Dry bulb temperature C. Dewpoint temperature D. Saturation temperature Answer: B The latent heat of the air is a function of the A. Wet bulb temperature B. Dry bulb temperature C. Dewpoint temperature D. Saturation temperature Answer: A - - THE END - - NOTE: PLEASE KEEP THIS FILE CONFIDENTIAL  POWER AND INDUSTRIAL PLANT ENGINEERING I. FAMILIARIZE THE FOLLOWING Is the most common dryer used which consist of rotating cylinder inside which the materials flow while getting in contact with hot gas. A. Tower dryer C. Trey dryer B. Centrifugal dryer D. Rotary dryer Answer: (D) Rotary Dryer Is the ratio of the mass of water-vapor in air and the mass of air if it is saturated is called: A. Humidity ratio C. Vapor ratio B. Mass ratio D. Relative humidity Answer: (D) Relative Humidity The hands feel painfully cold when the skin temperature reaches A. 8 deg C C. 12 deg C B. 10 deg C D. 14 deg C Answer: (B) 10 deg C The refrigerant used in steam jet cooling is: A. Steam C. Ammonia B. R-11 D. Water Answer: (D) Water The total heat of the air is a function of A. WB temperature C. DB temperature B. DP temperature D. WB depression Answer: (A) Wet Bulb Temperature Boiling point of Freon-12 at atmospheric pressure is: A. 21 deg F C. 5 deg F B. 15 deg F D. 28 deg F Answer: (A) 21 deg F PIPE CNS 02 Which of the following is NOT a type of water cooled condenser in refrigeration? A. Double pipe C. Shell and coil B. Double shell D. Shell and tube Answer: (B) Double Shell Component of absorption refrigeration system in which the solution is cooled by cooling water. A. Rectifier C. Evaporator B. Generator D. Absorber Answer: (D) Absorber Cascade refrigeration cycle is often used in industrial process where objects must be cooled to temperature below: A. -46 deg C C. -66 deg C B. -56 deg C D. -76 deg C Answer: (A) -46 deg C Type of refrigerant control designed to maintain a pressure difference while the compressor is operating. A. Thermostatic expansion C. Automatic expansion valve valve B. Using low side float D. Capillary tube flooded system Answer: (D) Capillary Tube As a rule of thumb, for a specified amount of compressed air, the power consumption of the compressor decreases by ___________ for each 3 deg C drop in the temperature inlet air to the compressor. A. 1 percent C. 2 percent B. 1.5 percent D. 2.5 percent Answer: (A) 1 percent Modern way of detecting air compressor leak is by using A. Soup and water C. Acoustic leak detector B. Air leak detector D. Ammonia leak detector Answer: (C) Acoustic Leak Detector PIPE CNS 02 For foundation of stacks, the maximum pressure on the soil is equal to the pressure due to the weight and the ___________. A. Soil movement C. Ground movement B. Wind movement D. Engine movement Answer: (B) Wind Movement Foundation bolts of specified size should be used and surrounded by a pipe sleeve with an inside diameter of at least A. 3 times the diameter of C. 3 times the diameter of engine bolt anchor bolt B. 2 times the diameter of D. 2 times the diameter of engine bolt anchor bolt Answer: (C) 3 times the diameter of anchor bolt For multi stage compression of an ideal Brayton cycle, the back ratio will A. Increase C. Remains the same B. Decrease D. None of these Answer: (B) Decrease Type of turbine that has a specific speed below 5. A. Impulse turbine C. Francis turbine B. Propeller turbine D. Deriaz turbine Answer: (A) Impulse turbine A high discharge type of turbine A. Impulse turbine C. Francis turbine B. Propeller turbine D. Deriaz turbine Answer: (B) Propeller Turbine Use to minimize the speed rise due to a sudden load rejection A. Needle valve C. Shut-off valve B. Wicket gate shut-off D. Jet deflector Answer: (D) Jet Deflector Is the speed of a turbine when the head on the turbine is one meter A. Specific speed C. Utilized speed B. Rated speed D. Unit speed Answer: (D) Unit Speed PIPE CNS 02 Is a fluid property which refers to the intermolecular attraction by which the separate particles of the fluid arc held together. A. Cohesion C. Surface tension B. Adhesion D. Hypertension Answer: (A) Cohesion Which of the following is NOT the cause of black smoke in diesel engine? A. Fuel valve open too C. Carbon in exhaust pipe long D. Overload on engine B. High compression pressure Answer: (B) High Compression pressure Which of the following is not a method of starting a diesel engine? A. Manual: rope, crank and C. Compressed air kick D. Using another generator B. Electric (battery) Answer: (D) Using another generator Two-stroke engine performs ________ to complete one cycle. A. Suction and discharge C. Power and exhaust stroke stroke D. Suction and exhaust B. Compression and power stroke stroke Answer: (B) Compression and power stroke A type of geothermal plant used when there is a presence of brine extracted from underground A. Dry geothermal plant C. Single flash geothermal B. Double-flash geothermal plant D. Binary geothermal plant Ans. (D) Binary geothermal plant Is the most important safety device on the power boiler. A. Check valve C. Safety valve B. Gate valve D. Globe valve Answer: (C) Safety valve PIPE CNS 02 During hydrostatic test, the safety valves should be A. Removed C. Closed B. Open D. Partially closed Answer: (A) Removed Where deaerating heaters are not employed, it is recommended that the temperature of the feed water be not less than ______ A. 197 deg C C. 104 deg C B. 102 deg C D. 106 deg C Answer: (A) 197 deg C Is a reaction during which chemical energy is released in the form of heat. A. Cosmic reaction C. Endothermic reaction B. Ethnic reaction D. Exothermic reaction Answer: (D) Exothermic reaction By reheating the steam in an ideal Ranking cycle the heat rejected will. A. Increase C. Remains the same B. Decrease D. None of these Answer: (A) Increase By increasing the boiler pressure in Rankine cycle the moisture content at boiler exit will. A. Increase C. Remains the same B. Decrease D. None of those Answer: (A) Increase Presently the highest steam temperature allowed at the turbine inlet is about ______. A. 340 deg C C. 620 deg C B. 520 deg C D. 1020 deg C Answer: (C) 620 deg C Two most common gases employed in Stirling and Ericsson cycles are. A. Air and helium C. Hydrogen and helium B. Oxygen and helium D. Nitrogen and helium Ans. (C) Hydrogen and Helium PIPE CNS 02  In most common design of gas turbine, the pressure ratio ranges from A. 10 to 12 C. 12 to 18 B. 11 to 16 D. 15 to 20 Answer: (B) 11 to 16 In Brayton cycle, the heat is transformed during what process? A. Constant temperature C. Isobaric process B. Isentropic process D. Isochoric process Answer: (C) Isobaric Process The fuel injection process in diesel engine starts when the piston ______ A. Is at the TDC C. Approaches TDC B. Leaving TDC D. Halfway of the stroke Answer: (C) Approaches TDC If the cut-off ratio of diesel cycle increases, the cycle efficiency will A. Decrease C. Remains the same B. Increase D. None of these Answer: (A) Decrease The fuel used in a power plant that is used during peak periods. A. Gas C. Liquid B. Solid D. None of these Answer: (C) Liquid Typical compression ratio of Otto cycle is A. 6 C. 10 B. 8 D. 12 Answer: (B) 8 If joule Thomson coefficient is equal to zero, then the process will become A. Isentropic C. Isobaric B. Isenthalpic D. Isothermal Answer: (D) Isothermal PIPE CNS 02 If the fluid passed through a nozzle its entropy will: A. Increase C. Remains the same B. Decrease D. None of these Answer: (C) Remains the same Refrigerant consisting of mixtures of two or more different chemical compounds, often used individuals as refrigerant for other applications. A. Suspension C. Blends B. Compound reaction D. Mixing of refrigerant Answer: (C) Blends Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them A. Check valve C. Safety valve B. Gate valve D. Campanion valve Answer: (D) Companion Valve An enclosed passage way that limits travel to a single path. A. Corridor C. Lobby B. Hallway D. Tunnel Answer: (A) Corridor For immediate dangerous to life or health (IDHL), the maximum concentration from which unprotected persons are able to escape within _____ without escape-impairing symptoms or irreversible health. A. 15 min C. 20 min B. 1 min D. 30 min Ans. (D) 30 minutes The volume as determined from internal dimensions of the container with no allowance for the volume of internal parts. A. Internal allowance C. Internal interference B. Internal gross volume volume D. Internal fits volume Answer: (B) Internal Gross Volume PIPE CNS 02 A waiting room or large hallway serving as a waiting room A. Terrace C. Compound room B. Rest room D. Lobby Answer: (D) Lobby A continuous and unobstructed path of travel from any point in a building or structure to a public way A. Average of aggress C. Hallway of aggress B. Mean of aggress D. Pathway of aggress Answer: (B) Mean of aggress Any device or portion of the equipment used to increase refrigerant pressure A. Pressure relief device C. Pressure lift device B. Pressure-imposing D. Pressure limiting device element Answer: (B) Pressure-imposing element The quantity of refrigerant stored at some point is the refrigeration system for operational, service, or standby purposes A. Pressure vessel C. Liquid receiver B. Pumpdown charge D. Accumulator Answer: (B) Pumpdown charge Secondary refrigerant is a liquid used for the transmission of heat, without a change of state, and having no flash point or a flash point above ______ as determined from ASTM A. 150 deg F C. 180 deg F B. 160 deg F D. 200 deg F Answer: (A) 150 deg F A service valve for dual pressure-relief devices that allows using one device while isolating the other from the system, maintaining one valve in operation at all times. A. Three-way valve C. One-way valve B. Two-way valve D. Four-way valve Answer: (A) three-way valve PIPE CNS 02 Tubing that is enclosed and therefore exposed to crushing, abrasion, puncture, or similar damage after installation. A. Protected tubing C. Open tubing B. Bare tubing D. Unprotected tubing Answer: (D) Unprotected tubing Refers to blends comprising multiple components of different volatile that, when used in refrigeration cycles, change volumetric composition and saturation temperature as they evaporate (boil) or condense at constant pressure. A. Zeolite C. Composition B. Blending D. Zeotropic Answer: (D) Zeotropic Is a premises or that of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others A. Institutional occupancy C. Residential occupancy B. Public assembly D. Commercial occupancy occupancy Answer: (A) Institutional occupancy Is one in which a secondary coolant is in direct contact with the air or other substance to be cooled or heated. A. Double indirect open C. Indirect closed system spray system D. Indirected, verted B. Indirect open spray closed system system Answer: (B) Indirect open spray system Refrigerant number R-744 is A. Butane C. Propane B. Carbon monoxide D. Carbon dioxide Answer: (D) Carbon dioxide Refrigerant number R-1150 is A. Propylene C. Ethane B. Ethene D. Methyl formate Answer: (B) Ethene PIPE CNS 02 Refrigerant R-40 is A. Chlorodifluoromethane C. Ammonia B. Difluoromenthane D. Chloromethane Answer: (D) Chloromethane When the air duct system serves several enclosed spaces, the permissible quantity of refrigerant in the system shall not exceed the amount determined by using the total volume of those spaces in the which the airflow cannot be reduced to less than ____ of its maximum when the fan is operating A. One-quarter C. Three-quarter B. One half-quarter D. One-fourth-quarter Answer: (A) One-quarter The space above a suspended ceiling shall not be included in calculating the permissible quantity of refrigerant in the system unless such space is continuous and is part of the air return system A. Partition C. Separator B. Plenums D. Plate divider Answer: (B) Plenums Which of the following is not a possible location of service valve? A. Suction of compressor C. Outlet of liquid B. Discharge of compressor receiver D. Outlet of condenser Answer: (D) Outlet of condenser A coil in series with evaporator that is use to prevent the liquid refrigerant entering the compressor A. Accumulator D. Liquid suction heat B. Liquid superheater exchanger C. Drier loop Answer: (C) Drier loop A type of valve connected from discharge of compressor directly to suction that is normally closed and will open automatically only if there is high discharge pressure A. Check valve C. King valve B. Solenoid valve D. Relief valve Answer: (B) Solenoid valve PIPE CNS 02 Use to increase the capacity of condenser A. Water regulating valve C. Liquid-suction heat B. Desuperheating coils exchanger D. Condenser heating coils Answer: (B) Desuperheating coils Is use to subcooled the refrigerant from the condenser A. Liquid line C. Desuperheating coils B. Condenser subcooler D. Liquid receiver Anwser: (A) Liquid line* Which of the following is NOT a part of low pressure side in refrigeration system? A. Compressor C. Liquid line B. Condenser D. Suction line Answer: (D) Suction Line Which of the following is NOT a part of condensing unit? A. Compressor C. Condenser B. Discharge line D. Liquid line Answer: (D) Liquid line By subcooling the refrigerant in refrigeration system, the compressor power per unit mass will A. Increase C. Remains the same B. Decrease D. None of these Answer: (C) Remains the same Superheating the refrigerant in refrigeration system, the specific volume at compressor suction will A. Increase C. Remains the same B. Decrease D. None of these Answer: (C) Remains the same By subcooling the refrigerant in refrigeration system, the specific volume at compressor suction will A. Increase C. Remains the same B. Decrease D. None of these Answer: (C) Remains the same PIPE CNS 02 Pressure loss due to friction at the condenser, the compressor power per unit mass will A. Increase C. Remains the same B. Decrease D. None of these Answer: (C) Remains the same Which of the following is NOT a type of air-cooled condenser? A. Shell and tube C. Forced draft B. Natural draft D. Induced draft Answer: (A) Shell and tube A type of refrigerant control typically used in household refrigeration A. Thermostatic expansion C. Capillary tube valve D. High side float B. Automatic expansion valve Answer: (C) Capillary Tube Type of condenser that operates like a cooling water A. Air-cooled condenser C. Shell and tube condenser B. Evaporative condenser D. Water cooled condenser Answer: (B) Evaporative condenser The major problem of heat pump is A. Refrigerant used C. Supply air B. Outside air D. Frosting Answer: (D) Frosting Dominant refrigerant used in commercial refrigeration system A. R11 C. R12 B. R22 D. R502 Answer: ( D) R502 Cascade refrigerant system are connected in A. Series C. Series-parallel B. Parallel D. Parallel Answer: (A) Series PIPE CNS 02 Is use to heat up the solution partially before entering the generator in absorption refrigeration system A. Rectifier C. Regenerator B. Absorber D. Pump Answer: (C) Regenarator The COP of actual absorption refrigeration system is usually A. Less than 1 C. Less than 3 B. Less than 2 D. Less than 4 Answer: (A) Less than 1 Sight glass is often located at A. Discharge line C. Between condenser and B. Liquid line liquid receiver D. Suction line Answer: (B) Liquid line Use to detects a vibration in current caused by the ionization of decomposed refrigerant between two opposite charged platinum electrodes A. Electronic detector C. Bubble method B. Halide torch D. Pressurizing Answer: (A) Electronic detector The ability of oil to mix with refrigerants A. Carbonization C. Mixing B. Purging D. Miscibility Answer: (D) Miscibility Joints and all refrigerants-containing parts of a refrigerating system located in an air duct carrying conditioned air to and from an occupied space shall be constructed to withstand a temperature of ____ without leakage into the airstream. A. 550F C. 650F B. 600F D. 700F Answer: (D) 700F PIPE CNS 02 Refrigerant piping crossing an open space that affords passageway in any building shall be not loss than ______ above the floor unless the piping is located against the ceiling of such space and is permitted by the authority having jurisdiction A. 2.2 m C. 4.2 m B. 3.2 m D. 5.2 m Answer: (A) 2.2m Methyl chloride shall not be in contact with A. Aluminum C. Magnesium B. Zinc D. All of these Answer: (D) All of these Shall not be in contact with any halogenated refrigerants A. Aluminum C. Magnesium B. Zinc D. All of these Answer: (C) Magnesium Are suitable for use in ammonia system A. Copper C. Plastic B. Aluminum and its alloy D. Cast iron Answer: (B) Aluminum and its alloy In a pressure-relief device is used to protect a pressure vessel having an inside dimension of 6 in or less, the ultimate strength of the pressure vessel so protected shall be sufficient to withstand a pressure at least ____ the design pressure A. 2 times C. 4 times B. 3 times D. 5 times Answer: (B) 3 times Seats and discs shall be limited in distortion, by pressure or other cause, to set pressure change of not more than ____ in a span of five years. A. 1% C. 10% B. 5% D. 50% Answer: (B) 5% PIPE CNS 02 Liquid receivers, if used or parts of a system designed to receive the refrigerant change during pumpdown charge. The liquid shall not occupy more than __of the volume when temperature of the refrigerant is 90F A. 80% C. 90% B. 85% D. 95% Answer: (C) 90% The discharge line (B4) shall be vented to the atmosphere through a ____ fitted to its upper extremity. A. Nozzle C. Pipe B. Convergent-divergent D. Diffuser nozzle Answer: (D) Diffuser Convert fossil fuels into the shaft work A. Nuclear power plant C. Dendrothermal power B. Gas turbine power plant plant D. Thermal power plant Answer: (D) Thermal power plant Ultimate strength drops by 30% as steam temperature raises from ____ for unalloyed steel A. 300 to 400 C C. 600 to 700 C B. 400 to 500 C D. 700 to 800 C Answer: (B) 400 to 500 C Recent practice limits steam temperature to A. 438 C C. 648 C B. 538 C D. 738 C Answer: (A) 438 C In a closed feed water heater, the feed water pass through A. Inside the tube C. Inside the shell B. Outside the tube D. Outside the shell Answer: (A) Inside the tube Is use if extracted steam upon condensation gets subcooled A. Trap C. Filter B. Deaerator D. Drain cooler Answer: (D) Drain cooler PIPE CNS 02 Needs only single pump regardless of number of heaters A. Open heater C. Mono heater B. Closed heater D. Regenerative heater Answer: (B) Closed heater Is also known as deaerator A. Open heater C. Reheat heater B. Closed heater D. Regenerative heater Answer: (A) Open Heater Dissolve gases like _____ makes water corrosive react with metal to form iron oxide A. O2 and N2 C. O2 and CO2 B. O2 and CO D. N2 and SO2 Answer: (C) O2 and CO2 A cycle typically used in paper mills, textile mills, chemical factories, sugar factories and rice mills A. Cogeneration cycle C. By-products cycle B. Combined cycles D. Cascading cycle Answer: (A) Cogeneration cycle When process steam is basic need and power is byproduct, this cycle is known as A. Cogeneration cycle B. Combined cycles C. By-product cycle D. Cascading cycle Answer: (C) By-product cycle PIPE CNS 02 A type of turbine employed where steam continuously extracted for process heating A. Back-pressure turbine C. Steam turbine B. Gas turbine D. Passout turbine Answer: (D) Passout turbine Which of the following is used for binary cycle power generation for high temperature application? A. Mercury C. Potassium B. Sodium D. All of these Answer: (D) All of these Critical temperature of mercury is A. 1160 c C. 1360 c B. 1260 c D. 1460 c Answer: (D) 1460 C Critical pressure of mercury is A. 100 MPa C. 128 Mpa B. 108 Mpa D. 158 MPa Answer: (B) 108 Mpa Method used in converting heat directly to electricity by magnetism A. Electromagnetic C. Magnetohydrodynamic induction D. Thermoelectric B. Magnetodynamic Answer: (C) Magnetohydrodynamic Which of the following is not a material used for thermoelectric elements A. Bismuth telluride C. Zinc telluride B. Lead telluride D. Germanium Answer: (C) Zinc telluride a type of coal formed after anthratice A. Lignite C. Peat B. Bituminous D. Graphite Answer: (D) Graphite Which of the following is lowest grade of coal? PIPE CNS 02  A. Peat C. Sub- bituminous B. Lignite D. Bituminous Answer: (B) Lignite Which of the following helps in the ignition of coal? A. Moisture C. Fixed carbon B. Ash D. Volatile matter Answer: (D) Volatile matter Is the ratio of fixed carbon and volatile matter. A. Air-fuel ratio C. Combustion ratio B. Fuel ratio D. Carbon-volatile ratio Answer. (B) Fuel ratio A suspension of a finely divide fluid in another. A. Filtration C. Emulsion B. Floatation D. Separation Answer. (C) Emuslion Contains 90% gasoline and 10% ethanol. A. Gasohol C. Gasothanol B. Gasonol D. Gasethanol Answer: (A) Gasohol Process used commercially in coal liquefaction. A. Tropsch process C. Fisher-tropsch process B. Fisher process D. Mitch-tropsch process Answer. (C) Fisher-tropsch process Is an organic matter produced by plants in both land and water. A. Bio-ethanol C. Petroleum B. Biomass D. Biogradable Answer. (B) Biomass In thermal power plant, induced draft fans are located at the A. Exit of furnace C. Above the stack B. Foot of the stack D. Top of the stack Answer: (B) Foot of the stack PIPE CNS 02 In thermal power plant, forced draft fans are installed at the A. Foot of the stack C. Exit of the preheater B. Top of the stack D. Inlet of the preheater Answer: (D) Inlet of the preheater Known as drum less boiler. A. La Mont boiler C. Force circulation boiler B. Fire tube boiler D. Once-through boiler Answer: (D) Once-through boiler Reduces the steam temperature by spraying low temperature water from boiler drum. A. Reheater C. Desuperheater B. Preheater D. Superheater Answer. (C) Desuperheater Carbon dioxide can be removed by: A. Deaeration C. Evaporation B. Aeration D. Vaporization Answer. (B) Aeration Is often used to absorb silica from water. A. Sorbent C. Silica gel B. Rectifier D. Magnesium hydroxide Answer. (D) Magnesium hydroxide Presence of excess hydrogen ions makes the water A. Acidic C. Base B. Alkalinity D. Hydroxicity Answer. (A) Acidic PH of water varies with A. Pressure C. Density B. Temperature D. Volume Answer. (B) Temperature PIPE CNS 02 Ph value of ______ is usually maintained for boiler water to minimized corrosion. A. 8.5 C. 10.5 B. 9.5 D. 11.5 Answer. (C) 10.5 What type of turbine that has a degree of reaction of ½? A. Impulse turbine C. Rarsons turbine B. Reaction turbine D. Deriaz turbine Answer. (C) Rarsons turbine Tranquil flow must always occur A. Above the normal depth C. Below the normal depth B. Above the critical depth D. Below the critical depth Answer. (B) Above the critical depth Which of the following head loss coefficient among the following types of entrance? A. Bell mouth C. Reentrant B. Square edge D. It depends Answer. (C) Reentrant What waste treatment method involves of algae from stabilization pond effluents? A. Sedimentation C. Filtration B. Floatation D. Microscreening Answer. (D) Microscreening The number of nozzles will depend on the quantity of steam required by the turbine. If nozzles occupy the entire ….. the ring, the turbine is said to have: A. Partially full C. Maximum peripheral peripheral admission admission B. One-half peripheral D. Full peripheral admission admission Answer. (D) Full peripheral admission PIPE CNS 02 Tandem compound units may also have two low-pressure castings that produces: A. Single flow C. Triple flow B. Double flow D. Quadruple flow Answer. (C) Triple flow A type of turbine used for driving pumps, fans, and other auxiliaries in power plant commonly operate at exhaust pressure approximating atmospheric. A. Tandem compound turbine C. Cross-compound turbine B. Passout turbine D. Back pressure turbine Answer. (D) Back pressure turbine A governor with 0% regulation is termed as: A. Isochronous governor C. Isenchronous governor B. Synchronous governor D. Isobarnous governor Answer. (A) Isochronous governor The speed regulation for most turbine-generators is adjustable from: A. 2 to 6% C. 6 to 10% B. 4 to 8% D. 8 to 12% Answer. (A) 2 to 6% Poppet valves of steam turbine are used for extraction pressure of: A. 20 to 120 psig C. 20 to 130 psig B. 20 to 150 psig D. 20 to 140 psig Answer. (B) 20 to 150 psig When both bearings of steam engines are on one side of the of the connecting rod, the engine is referred to as: A. Center-crank engine C. Under crank engine B. Side crank engine D. Standard crank engine Answer. (B) Side crank engine When the valve in steam engine is in mid-position of its travel, it will cover the steam port by an amount known A. Steam lap C. Full lap B. Partial lap D. Angular lap Answer. (A) Steam lap PIPE CNS 02 A type of governor in steam engine that do not control the actual admission of steam to the cylinder but controls the pressure of the steam. A. Flyball governor C. Throttling governor B. Variable cut-off D. Shaft governor governor Answer. (C) Throttling governor By inter-cooling using two stage compressor of Brayton cycle, the backwork ratio will: A. Increase C. Remains constant B. Decrease D. None of these Answer. (B) Decrease On dynamic similitude, the relation which represents the ratio of inertia force to pressure force is: A. Froude number C. Euler number B. Cauchy number D. Reynolds number Answer. (C) Euler number What is the maximum velocity in a sewer flowing full? A. 0.6 m/sec C. 1.2 m/sec B. 0.9 m/sec D. 1.8 m/sec Answer. (A) 0.6 m/sec A temporary structure constructed to exclude water from the side of the foundation during its excavation and construction is called. A. Calsson C. Coffer dam B. Retaining wall D. Earth dam Answer. (C) Coffer dam Which is not a physical characteristic of water? A. Total suspended and C. Color dissolve solids D. Hardness B. Tubidity Answer. (D) Hardness Which dam is best for weak foundation? A. Gravity C. Buttress B. Arch D. Earth Answer. (C) Buttress PIPE CNS 02 What is the volume of water which will drain freely from the aquifer? A. Specific yield C. Safe yield B. Reservoir yield D. Secondary yield Answer. (A) Specific yield What is the line defined by the water level in a group of artesian wells? A. Water table C. Specific yield B. Peizometric surface D. All of the above Answer. (B) Peizometric surface Select the one that is a positive indication of pollution of a river. A. Acidity C. Chloride content B. Oxygen content D. Nitrite content Answer. (C) Chloride content The cooling water is made to fall in series of baffles to expose large surface area for steam led from below to come in direct contact. A. Spray condenser C. Jet condenser B. Surface condenser D. Barometric condenser Answer: (D) Barometric condenser Show the variation of river flow (discharge) with time A. Hydrograph C. Mass curve B. Hyctograph D. Flow duration curve Answer: (A) Hydrograph Is an open channel erected on a surface above the ground. A. Canal C. Pentstock B. Tunnel D. Flume Answer: (D) Flume Type of turbine used up to 300 m head A. Impulse turbine C. Propeller turbine B. Francis turbine D. Deriaz turbine Answer: (D) Deriaz turbine PIPE CNS 02  Oil is atomized either by air blast or pressure jet at about A. 60 bar C. 80 bar B. 70 bar D. 90 bar Answer: (B) 70 bar Type of solid injection that use single pump supplies fuel under high pressure to a fuel header. A. Common rail injection C. Distributor system B. Individual pump D. Single rail injection injection system Answer: (A) Common rail injection Water flow in diesel engine that is caused by density differential. A. Thermosiphon cooling C. Pressure water cooling B. Thermostat cooling D. Evaporative cooling Answer: (A) Thermosiphon cooling Type of lubrication system in diesel engine in which oil from pump is carried to a separate storage lank outside the engine cylinder and used for high capacity engine. A. Mist lubrication system B. Wet sump lubrication C. Splash system D. Dry sump lubrication system Answer: (D) Dry sump lubrication system Produces extreme pressure differentials and violent gas vibration. A. Vibration C. Explosion B. Detonation D. Knocking Answer: (B) Detonation In a spark ignition engine, detonation occurs near the ___________. A. End of combustion C. Beginning of combustion B. Middle combustion D. Beginning of interaction Answer: (A) End of combustion PIPE CNS 02 In a compression ignition engine, the detonation occurs near the ________. A. End of combustion C. Beginning of combustion B. Middle of combustion D. Beginning of interaction Answer: (C) Beginning of combustion Morse test is use to measure the _______ of multi-cylinder engine. A. Break power C. Friction power B. Indicated power D. Motor power Answer: (B) Indicated power Ignition delay can be min imized by adding _________ to decrease engine knocking. A. Ethel ether C. Ethyl nitrate B. Ethyl chloride D. Ethyl oxide Answer: (C) Ethyl nitrate At any point in fluid at rest, the pressure is the same in all directions. This principle is known as: A. Bernoulli principle C. Pascal’s law B. Archimedes principle D. Torricelli’s law Answer: (C) Pascal’s law The hot-wire manometer is used to measure A. Pressure in gasses C. Wind velocities at B. Pressure in fluids airports D. Gas velocities Answer: (D) Gas Velocities The pitot static tube measures A. The static pressure C. The total pressure B. The gage pressure D. The dynamic pressure Answer: (A) The static pressure PIPE CNS 02 The terminal velocity of a small sphere setting in a viscous fluid varies as the A. First power of its diameter B. Inverse of fluid viscosity C. Inverse square of the diameter D. Inverse of the diameter Answer: (B) Inverse of fluid viscosity Pressure drag results from A. Skin friction B. Deformation drag C. Breakdown of potential flow near the forward stagnation point D. Occurrences of wake Answer: (A) Skin friction The pressure coefficient is the ratio of pressure forces to: A. Viscous forces C. Gravity forces B. Inertia forces D. Surface tension force Answer: (B) Inertia forces Which instruments is used to measure humidity of the atmosphere continuously? A. Barograph C. Hydrograph B. Thermograph D. Thermo-hydrograph Answer: (C) Hydrograph Entrance losses between tank and pipe or losses through elbows, fittings and valves are generally expresses as a function of A. Kinetic energy C. Friction factor B. Pipe diameter D. Volume flow rate Answer: (A) Kinetic Energy The air that contains no water vapor is called A. Zero air C. Dry air B. Saturated air D. Humid air Answer: (C) Dry Air PIPE CNS 02 In psychrometric chart, the constant-enthalpy lines coincide with constant-temperature lines at temperature A. Above 50⁰C C. Below 50⁰C B. Below 40⁰C D. Above 10⁰C Answer: (C) Below 50 C The amount of moisture in air depend on its A. Pressure C. Temperature B. Volume D. Humidity Answer: (C) Temperature The deep body temperature of healthy person is maintained constant at A. 27⁰C C. 47⁰C B. 37⁰C D. 48⁰C Answer: (B) 37 C Air motion also plays important role in A. Surroundings C. Human comfort B. Cooling D. None of these Answer: (C) Human Comfort During simple heating and cooling process has a ____ humidity ratio A. Increasing C. Constant B. Decreasing D. None of these Answer: (C) Constant The _____ follows a line of constant wet-bulb temperature on the psychrometric chart. A. Evaporative cooling C. Direct cooling process process D. None of these B. Condensive cooling process Answer: (A) Evaporative cooling process A vapor which is not about to condensate is called a A. mixture of vapor and C. Superheated vapor liquid D. None of these B. critical vapor Answer: (C) Superheated vapor PIPE CNS 02 Passing from the solid phase directly into vapor phase is called A. Condensation C. Sublimation B. Fusion D. None of these Answer: (C) Sublimation Robert Boyle observed during his experiments with a vacuum chamber that the pressure of gases is inversely proportional to their A. Temperature C. Volume B. Pressure D. None of these Answer: (C) Volume ____ is energy in transition A. Heat C. Power B. Work D. None of these Answer: (A) Heat Is the mode of energy transfer between a solid surface and the adjacent liquid or gas which is in motion, and it involves combine effects of conduction and fluid motion. A. Conduction C. Radiation B. Convection D. None of these Answer: (B) Convection Radiation is usually considered as A. Surface phenomenon C. Surface corrosion B. Surface interaction D. None of these Answer: (A) Surface phenomenon Work is ____ between the system and the surroundings. A. Work interaction C. Heat interaction B. Energy interaction D. None of these Answer: (B) Energy interaction Is a process during which the system remains in equilibrium at all times A. Quasi-equilibrium C. Dynamic equilibrium B. Static equilibrium D. None of these Answer: (A) Quasi-equilibrium PIPE CNS 02 In the absence of any work interactions between a system and its surroundings , the amount of net heat transfer is equal A. The change in total energy of a closed system B. To heat and work C. Energy interactions D. none of these Answer: (A) The change in total energy of a closed system The constant volume and constant pressure specific heats are identical for A. compressible substance B. incompressible substance C. compressible gas D. none of these Answer: (B) Incompressible substance The velocity of fluid is zero at wall aand maximum at the center because of the A. velocity effect B. viscous effect C. temperature effect D. none of these Answer: (B) Viscous effect For steady flow devices, the volume of the control volume is A. increase B. decrease C. constant D. none of these Answer: (C) Constant Work done in turbine is ____ since it is done by the fluid. A. Positive B. Negative C. Zero D. None of these Answer: (A) Positive PIPE CNS 02  POWER AND INDUSTRIAL PLANT ENGINEERING I. FAMILIARIZE THE FOLLOWING  In Refrigeration, how do you call a heat exchanger in which low-pressure refrigerant boils or vaporizes, thus absorbing heat that was removed from the refrigerated area by the cooling medium (water)? a) Evaporator c) Chiller b) Cooler d) Flooded Evaporator Answer: c) Chiller. In refrigeration application, the appropriate term used for evaporator is chiller.  In an ideal standard Brayton cycle, 1.5 kg/s of air at 101 kPaa and 27 o C is compressed isentropically to a certain pressure and temperature after which the is added until the temperature becomes 1027 oC. Isentropic expansion occurs in the turbine. Determine the net power produced by the cycle. a) 629.56 kW c) 592.65 kW b) 529.76 kW d) 579.26 kW Answer: b) 529.76 kW  In an air standard Otto cycle, the clearance volume is 12 % of the displacement volume. What is the thermal efficiency? a) 57 % c) 59 % b) 58 % d) 60 % Answer: c) Thermal efficiency = 59 %  It is a type of refrigeration system where only part of the circulated refrigerant is evaporated, with the remainder being separated from the vapor and then recirculated. How do you call this system? a) Absorption refrigeration system b) Vacuum refrigeration system c) Vapor-compression refrigeration system d) Flooded refrigeration system Answer: d) Flooded refrigeration system  In an air-standard Brayton cycle, air enters compressor at 1 bar and 15 o C. The pressure leaving the compressor is 0.6 MPaa and maximum temperature of the cycle is 1000 oC. What is the maximum net work, in kJ/kg? a) 319.52 c) 392.51 b) 315.29 d) 352.19 Answer: d) Max Wnet = 352.19 kJ/kg 1|Page  How do you call the ice formation on a refrigeration system at the expansion device, making the device inoperative? a) Ice formation c) Freeze-up b) Freezing d) Pump-down Answer: c) Freeze-up  What is the clearance volumetric efficiency of an ammonia compressor designed with 4 % clearance and operating between condenser temperature of 30 oC (psat = 1.1672 MPaa) and evaporator temperature of 4 oC (psat = 497.48 kPaa)? a) 93.61 % c) 93.68 % b) 96.31 % d) 96.83 % Answer: b) Volumetric Efficiency = 96.31 %  In a lithium bromide solution absorption refrigeration system, which of the following is the function of water? a) Refrigerant c) Absorbent b) Coolant d) Analyzer Answer: a) Refrigerant. Water serves as refrigerant while the lithium bromide serves as the absorbent. In ammonia solution absorption refrigeration system, water serves as the absorbent while ammonia serves as the refrigerant.  The percent rating of water tube boiler is 200 %, factor of evaporation is 1.10, and heating surface is 400 ft2. Determine the rate of evaporation, in kg/hr. a) 1831 c) 1831 b) 1138 d) 1813 Answer: b) Rate of evaporation = 1138 kg/hr  In the absorption refrigeration system, is a pressure vessel mounted above the generator through which the vapor leaving the generator pass. How do you call this component? a) Absorber c) Analyzer b) Rectifier d) Reflux Answer: c) Analyzer or bubble column 2|Page  A Carnot cycle is represented by a rectangle in a Ts diagram that operates between temperature limits of 300 oK and 650 oK. Inscribed within a rectangle is a ellipse of maximum major and minor axes, represents a cycle and operating at the same temperature limits. Considering that the major axis of the ellipse is two times that of its minor axis. Determine the thermal efficiency of the cycle represented by an ellipse. a) 44.88 % c) 48.48 % b) 43.66 % d) 46.36 % Answer: a) 44.88 %  Determine the critical radius in cm for an asbestos-cement covered pipe [kasb = 0.208 W/m-oK]. The external heat-transfer coefficient is 1.5 Btu/h-ft2-oF. a. 2.44 cm c. 2.55 cm b. 2.66 cm d. 2.22 cm Answer: a) Critical radius = 2.44 cm  A hiker carried an Aneroid barometer from the foot of Mount Banahaw to the camp of the NPA leader Ka Roger. On the foot of the mountain, the barometer reads 30.150 inches of Hg, and on the camp, which is nearly at the top of the mountain it reads 28.607 inches of Hg. Assume that the average air density (atmospheric) was 0.075 pcf, estimate the height of the mountain, in ft. a) 1455.54 c) 1545.54 b) 1554.54 d) 1455.55 Answer: a) 1455.54 ft  In the absorption refrigeration system, it is the inlet part of the condenser, cooled by a separate circuit of cooling water or strong aqua. It condenses a small part of the vapor leaving the bubble column and returns it as a liquid to the top of baffle plate. This ensures that the vapor going to the condenser is lowered in temperature and enriched in ammonia. What is this component? a) Reflux c) Analyzer b) Rectifier d) Absorber Answer: b) Rectifier. Reflux does about the same thing by providing a small flow of condensed ammonia liquid to the top plate of the bubble column, but does not require a separate cooling circuit. 3|Page  In a geothermal power plant, the mass flow rate of ground water is 4000 kg/s and the quality after throttling is 20%. If the turbine power is 80 MW, what is the change in enthalpy of steam at the inlet and outlet of the turbine? a) 120 kJ/kg b) 100 kJ/kg c) 200 kJ/kg d) 150 kJ/kg Answer: b) Change of enthalpy = 100 kJ/kg  Determine the partial pressure of CO2 for the following analysis of gas mixture by weight at 101 kPaa and 25 oC: CO2 = 35 % and N2 = 65 %. a) 25.75 kPaa b) 27.55 kPaa c) 52.75 kPaa d) 52.57 kPaa Answer: a) partial pressure of CO2 = 25.75 kPaa  Which of the following is a scale of temperature in which the melting point of ice is taken as 0o and the boiling point of water is 80o? a) Reaumur Scale c) Carrene Scale b) Genetron Scale d) Frigorie Scale Answer: a) Reaumur Temperature Scale  A certain coal has the following ultimate analysis by weight. C = 67 %, Ash = 5 %, Moisture = 8 %, N = 6 %, H = 3 %, Sulfur = 7 %, O = 4 %. Calculate the higher heating value in Btu/lb. a) 15 179 c) 11 579 b) 17 519 d) 19 517 Answer: c) 11 579 Btu/lb  What is the amount of heat energy required to raise the temperature of one pound of water one degree Fahrenheit. It is 1/180 of the heat required to raise the temperature of one pound of water from 32 to 212 o F at constant atmospheric pressure of 14,696 psi absolute. a) Specific heat b) British thermal unit c) Calorie d) Sensible heat Answer: b) British thermal unit or Btu 4|Page  Determine the heating value of a certain fuel with a SG = 0.997. a) 42 975 kJ/kg c) 42 597 kJ/kg b) 42 795 kJ/kg d) 42 579 kJ/kg Answer: a) 42 975 kJ/kg  How do you call the mixtures or substances that are used in laboratory methods of producing a drop in temperature? The most common example is the mixture of ice and salt. a) Calorific mixture c) Water-ammonia mixture b) Frigorific mixture d) Hygroscopic mixture Answer: b) Frigorific mixture Note: Adding of 10 % salt (NaCl), by weight, to water lowers its freezing point from 32 oF to 18.7 oF.  If an airplane is flying at an altitude of 5 800 ft, what is the approximate atmospheric pressure at the said altitude? a) 12.34 psi c) 14.7 psi b) 13.24 psi d) 14.32 psi Answer: a) 12.34 psi  It the maximum temperature of any gas or vapor at which it may be condensed into a liquid; above this temperature, it is impossible to condense regardless of the pressure applied. How do you call this temperature? a) Saturation temperature c) Superheated temperature b) Critical temperature d) Dew point temperature Answer: b) Critical temperature  Calculate the energy transfer rate across 6” wall of firebrick with a temperature difference across of 50 oC. the thermal conductivity of the firebrick is 0.65 Btu/hr-ft-oF. a) 369 W/m2 c) 369 Btu/hr-Ft2 b) 639 W/m2 d) 639 Btu/hr-Ft2 Answer: a) Heat Transfer = 369 W/m2 5|Page  Any refrigerant that exists as a liquid under normal atmospheric pressure and temperature must be vaporized in an evaporator under a pressure below atmospheric. This is sometimes referred to as: a) Halogenated refrigerant c) Freon refrigerant b) Vacuum refrigerant d) Halocarbon refrigerant Answer: b) Vacuum refrigerant  What is the specific gravity of a fuel at 28o Baume? a) 0.868 c) 0.688 b) 0.886 d) 0.986 Answer: b) SG = 0.886  Air at 1 MPaa and 310 oC is expanded to 250 kPaa in accordance with the relation pV1.25 = C. Determine the work done. a) + 162.11 kJ/kg c) – 162.11 kJ/kg b) + 126.11 kJ/kg d) – 126.11 kJ/kg Answer: a) Work done, W = + 162.11 kJ/kg  It is any one of a group of refrigerants that have been developed since about 1925 to overcome the irritating or toxic effects of refrigerants, such as ammonia and sulfur dioxide and the high condensing pressures required with carbon dioxide. How do you call these refrigerants? a) Halogenated refrigerants c) Freon refrigerants b) Vacuum refrigerants d) Halocarbon refrigerants Answer: a) Halogenated refrigerants  A Rankine cycle operates with a thermal efficiency of 40 % and the factor of evaporation of the boiler is 1.15. Determine the mass flow rate of steam if the cycle power output is 5.5 MW. a) 5.3 kg/s c) 4.3 kg/s b) 3.5 kg/s d) 6.3 kg/s Answer: a) Steam mass flow rate, ms = 5.3 kg/s 6|Page  This refrigeration system component combines the functions of a cooling tower and a condenser. It consists of a casing enclosing a fan or blower section, water eliminators, refrigerant condensing coil, water pan, float valve, and spray pump outside the casing. How do you call this component? a) Water-cooled condenser c) Evaporative condenser b) Atmospheric condenser d) Chiller Answer: c) Evaporative condenser  A boiler operates at 82 % efficiency while the mass of steam generated is 490 200 kg in 6 hours. The enthalpy of steam is 3187 kJ/kg and feed is 604.83 kJ/kg while the fuel used for boiler has a heating value of 32 567.85 kJ/kg. Find the mass of fuel needed per day in metric tons. a) 179.6 c) 189.6 b) 198.6 d) 169.8 Answer: c) Fuel consumption per day = 189.6 metric tons  It refers to a factor used in calculating the over-all heat transfer through the tube walls of a condenser tube or other heating surface. It includes the sum of the heat-transfer rate of the layer of dirt and foreign material that builds up on the water side of the tube. What is this factor? a) Cooling factor c) Contact factor b) By-pass factor d) Fouling factor Answer: d) Fouling Factor  A 10 kg/s of air enters the theater at 16 oC. The theater is to be maintained at 27 oC DB and 20 oC WB. If the sensible heat ratio is 0.71, what is the latent heat load of the theater? a) 45.21 kW c) 54.21 kW b) 110.682 kW d) 42.51 Kw Answer: a) Latent heat load, qL = 45.21 kW  It is a refrigeration system evaporator which is arranged with a tank or a single drum (accumulator) located above the coil so that the inside of the evaporator is full of refrigerant. How do you call this type of evaporator? a) Flooded evaporator c) Dry evaporator b) Cooing coil evaporator d) Headered coil evaporator Answer: a) Flooded evaporator 7|Page  A 80 MW power plant has an average load of 34 500 kW and a load factor of 0.75. Find the reserve power over a peak load power. a) 14 000 kW c) 34 000 kW b) 24 000 kW d) 4 000 kW Answer: c) Reserve Power = 34 000 kW  What is the standardized term used by the industry to describe any device that meters or regulates the flow of liquid refrigerant to an evaporator? a) Refrigerant control b) Expansion valve c) Throttling valve d) Capillary tube Answer: b) Expansion Valve  A steam generator burns fuel oil with 25 % excess air. Fuel may be represented by C14H30. Calculate the actual-air fuel ratio. a) 17.63 c) 18.63 b) 16.63 d) 15.63 Answer: b) Actual A/F ratio = 18.63 kg air per kg fuel  Define a “control valve”. a) The value set on the scale of the control system in order to obtain the required condition b) The quantity or condition of the controlled medium c) The flow or pressure of the steam (or fluid) being manipulated d) The valve of the controlled condition actually maintained under steady state conditions Answer: d) The valve of the controlled condition actually under steady state conditions  A container filled with helium is dropped 3000 m above the ground, find the change of temperature? o o a) 12.43 C c) 9.43 C o o b) 15.43 C d) 8.43 C Answer: c) The change of temperature, T = 9.43 o C 8|Page  A pneumatic temperature control is used on the steam supply to a non- storage heat exchanger that heats water serving an office heating system. What is referred to as “manipulated variable”? a)The water being heated b)The air signal from the controller to the valve actuator c)The steam supply d)The temperature of the air being heated Answer: c) Manipulated variable is referred to as the steam supply  Which of the following valves is the one designed to allow a fluid to pass through in one direction? a) Globe valve c) Gate valve b) Float valve d) Check valve Answer: d) Check valve  A 3153-lb car is accelerated from 32 fps to 55 fps in 10 seconds. Determine the work done, in Btu. a) 125.92 c) 192.52 b) 152.92 d) 129.52 Answer: a) Work done, W = 125.92 Btu  How do you classify a solenoid valve? a) A thermal valve c) A magnetic stop valve b) A bellows valve d) A bi-metallic valve Answer: c) A solenoid valve is classified as magnetic stop valve  What is a thermostat? a) A temperature-operated switch b) A pressure-operated switch c) A superheat-operated switch d) A back pressure-operated switch Answer: a) A temperature –operated switch  A turbine has a peripheral coefficient of 0.6. Find the runner diameter of the turbine if it operates at 450 rpm and a head of 60 m. a) 0.874 m c) 0.784 m b) 0.478 m d) 0.748 m Answer: a) Water runner diameter, Dr = 0.874 m 9|Page  Which of the following is the one of the main purposes of refractory in a boiler furnace? a) Help preheat the air for the furnace b) Help preheat the feed water c) Protect economizer from excessive heat d) Prevent excessive furnace heat losses Answer: d) Prevent excessive furnace heat losses  Heat is transfer