Refrigeration and Air Conditioning Exam Questions PDF

Is the most common dryer used which consist of Cascade refrigeration cycle is often used in rotating cylinder inside which the materials industrial process where objects must be flow while getting in contact with hot gas. cooled to temperature below: A. Tower dryer...

Is the most common dryer used which consist of Cascade refrigeration cycle is often used in rotating cylinder inside which the materials industrial process where objects must be flow while getting in contact with hot gas. cooled to temperature below: A. Tower dryer A. -46 deg C B. Centrifugal dryer B. -56 deg C C. Trey dryer C. -66 deg C D. Rotary dryer D. -76 deg C Answer: (D) Rotary Dryer Answer: (A) -46 deg C Is the ratio of the mass of water-vapor in air Type of refrigerant control designed to and the mass of air if it is saturated is maintain a pressure difference while the called: compressor is operating. A. Humidity ratio A. Thermostatic expansion valve B. Mass ratio B. Using low side float flooded system C. Vapor ratio C. Automatic expansion valve D. Relative humidity D. Capillary tube Answer: (D) Relative Humidity Answer: (D) Capillary Tube The hands feel painfully cold when the skin As a rule of thumb, for a specified amount of temperature reaches compressed air, the power consumption of the compressor decreases by ___________ for each 3 A. 8 deg C deg C drop in the temperature inlet air to the B. 10 deg C compressor. C. 12 deg C D. 14 deg C A. 1 percent B. 1.5 percent Answer: (B) 10 deg C C. 2 percent D. 2.5 percent The refrigerant used in steam jet cooling is: Answer: (A) 1 percent A. Steam B. R-11 Modern way of detecting air compressor leak is C. Ammonia by using D. Water A. Soup and water Answer: (D) Water B. Air leak detector C. Acoustic leak detector The total heat of the air is a function of D. Ammonia leak detector A. WB temperature Answer: (C) Acoustic Leak Detector B. DP temperature C. DB temperature For foundation of stacks, the maximum pressure D. WB depression on the soil is equal to the pressure due to the weight and the ___________. Answer: (A) Wet Bulb Temperature A. Soil movement Boiling point of Freon-12 at atmospheric B. Wind movement pressure is: C. Ground movement D. Engine movement A. 21 deg F B. 15 deg F Answer: (B) Wind Movement C. 5 deg F D. 28 deg F Foundation bolts of specified size should be used and surrounded by a pipe sleeve with an Answer: (A) 21 deg F inside diameter of at least Which of the following is NOT a type of water A. 3 times the diameter of engine bolt cooled condenser in refrigeration? B. 2 times the diameter of engine bolt C. 3 times the diameter of anchor bolt A. Double pipe D. 2 times the diameter of anchor bolt B. Double shell C. Shell and coil Answer: (C) D. Shell and tube For multi stage compression of an ideal Answer: (B) Double Shell Brayton cycle, the back ratio will Component of absorption refrigeration system A. Increase in which the solution is cooled by cooling B. Decrease water. C. Remains the same D. None of these A. Rectifier B. Generator Answer: (B) Decrease C. Evaporator D. Absorber Type of turbine that has a specific speed below 5. Answer: (D) Absorber A. Impulse turbine B. Propeller turbine C. Francis turbine D. Deriaz turbine Answer: (A) Impulse turbine Is the most important safety device on the power boiler. A high discharge type of turbine A. Check valve A. Impulse turbine B. Gate valve B. Propeller turbine C. Safety valve C. Francis turbine D. Globe valve D. Deriaz turbine Answer: (C) Safety valve Answer: (B) Propeller Turbine During hydrostatic test, the safety valves Use to minimize the speed rise due to a sudden should be load rejection A. Removed A. Needle valve B. Open B. Wicket gate shut-off C. Closed C. Shut-off valve D. Partially closed D. Jet deflector Answer: (A) Removed Answer: (D) Jet Deflector Where deaerating heaters are not employed, it Is the speed of a turbine when the head on the is recommended that the temperature of the turbine is one meter feed water be not less than ______ A. Specific speed A. 197 deg C B. Rated speed B. 102 deg C C. Utilized speed C. 104 deg C D. Unit speed D. 106 deg C Answer: (D) Unit Speed Answer: (A) 197 deg C Is a fluid property which refers to the Is a reaction during which chemical energy is intermolecular attraction by which the released in the form of heat. separate particles of the fluid arc held together. A. Cosmic reaction B. Ethnic reaction A. Cohesion C. Endothermic reaction B. Adhesion D. Exothermic reaction C. Surface tension D. Hypertension Answer: (D) Exothermic reaction Answer: (A) Cohesion By reheating the steam in an ideal Ranking cycle the heat rejected will. Which of the following is NOT the cause of black smoke in diesel engine? A. Increase B. Decrease A. Fuel valve open too long C. Remains the same B. High compression pressure D. None of these C. Carbon in exhaust pipe D. Overload on engine Answer: (A) Increase Answer: (B) High Compression pressure By increasing the boiler pressure in Rankine cycle the moisture content at boiler exit Which of the following is not a method of will. starting a diesel engine? A. Increase A. Manual: rope, crank and kick B. Decrease B. Electric (battery) C. Remains the same C. Compressed air D. None of those D. Using another generator Answer: (A) Increase Answer: (D) Using another generator Presently the highest steam temperature Two-stroke engine performs ________ to allowed at the turbine inlet is about ______. complete one cycle. A. 340 deg C A. Suction and discharge stroke B. 520 deg C B. Compression and power stroke C. 620 deg C C. Power and exhaust stroke D. 1020 deg C D. Suction and exhaust stroke Answer: (C) 620 deg C Answer: (B) Compression and power stroke Two most common gases employed in Stirling and A type of geothermal plant used when there is Ericsson cycles are. a presence of brine extracted from underground A. Air and helium A. Dry geothermal plant B. Oxygen and helium B. Double-flash geothermal C. Hydrogen and helium C. Single flash geothermal plant D. Nitrogen and helium D. Binary geothermal plant Ans. (C) Hydrogen and Helium Ans. (D) Binary geothermal plant In most common design of gas turbine, the A. Suspension pressure ratio ranges from B. Compound reaction C. Blends A. 10 to 12 D. Mixing of refrigerant B. 11 to 16 C. 12 to 18 Answer: (C) Blends D. 15 to 20 Pairs of mating stop valves that allow Answer: (B) 11 to 16 sections of a system to be joined before opening these valves or separated after In Brayton cycle, the heat is transformed closing them during what process? A. Check valve A. Constant temperature B. Gate valve B. Isentropic process C. Safety valve C. Isobaric process D. Campanion valve D. Isochoric process Answer: (D) Companion Valve Answer: (C) Isobaric Process An enclosed passage way that limits travel to The fuel injection process in diesel engine a single path. starts when the piston ______ A. Corridor A. Is at the TDC B. Hallway B. Leaving TDC C. Lobby C. Approaches TDC D. Tunnel D. Halfway of the stroke Answer: (A) Corridor Answer: (C) Approaches TDC For immediate dangerous to life or health If the cut-off ratio of diesel cycle (IDHL), the maximum concentration from which increases, the cycle efficiency will unprotected persons are able to escape within _____ without escape-impairing symptoms or A. Decrease irreversible health. B. Increase C. Remains the same A. 15 min D. None of these B. 1 min C. 20 min Answer: (A) Decrease D. 30 min The fuel used in a power plant that is used Ans. (D) 30 minutes during peak periods. The volume as determined from internal A. Gas dimensions of the container with no allowance B. Solid for the volume of internal parts. C. Liquid D. None of these A. Internal allowance B. Internal gross volume Answer: (C) Liquid C. Internal interference volume D. Internal fits volume Typical compression ratio of Otto cycle is Answer: (B) Internal Gross Volume A. 6 B. 8 A waiting room or large hallway serving as a C. 10 waiting room D. 12 A. Terrace Answer: (B) 8 B. Rest room C. Compound room If joule Thomson coefficient is equal to zero, D. Lobby then the process will become Answer: (D) Lobby A. Isentropic B. Isenthalpic A continuous and unobstructed path of travel C. Isobaric from any point in a building or structure to a D. Isothermal public way Answer: (D) Isothermal A. Average of aggress B. Mean of aggress If the fluid passed through a nozzle its C. Hallway of aggress entropy will: D. Pathway of aggress A. Increase Answer: (B) Mean of aggress B. Decrease C. Remains the same Any device or portion of the equipment used to D. None of these increase refrigerant pressure Answer: (C) Remains the same A. Pressure relief device B. Pressure-imposing element Refrigerant consisting of mixtures of two or C. Pressure lift device more different chemical compounds, often used D. Pressure limiting device individuals as refrigerant for other applications. Answer: (B) Pressure-imposing element The quantity of refrigerant stored at some Refrigerant number R-744 is point is the refrigeration system for operational, service, or standby purposes A. Butane B. Carbon monoxide A. Pressure vessel C. Propane B. Pumpdown charge D. Carbon dioxide C. Liquid receiver D. Accumulator Answer: (D) Carbon dioxide Answer: (B) Pumpdown charge Refrigerant number R-1150 is Secondary refrigerant is a liquid used for the A. Propylene transmission of heat, without a change of B. Ethene state, and having no flash point or a flash C. Ethane point above ______ as determined from ASTM D. Methyl formate A. 150 deg F Answer: (B) Ethene B. 160 deg F C. 180 deg F Refrigerant R-40 is D. 200 deg F A. Chlorodifluoromethane Answer: (A) 150 deg F B. Difluoromenthane C. Ammonia A service valve for dual pressure-relief D. Chloromethane devices that allows using one device while isolating the other from the system, Answer: (D) Chloromethane maintaining one valve in operation at all times. When the air duct system serves several enclosed spaces, the permissible quantity of A. Three-way valve refrigerant in the system shall not exceed the B. Two-way valve amount determined by using the total volume of C. One-way valve those spaces in the which the airflow cannot D. Four-way valve be reduced to less than ____ of its maximum when the fan is operating Answer: (A) three-way valve A. One-quarter Tubing that is enclosed and therefore exposed B. One half-quarter to crushing, abrasion, puncture, or similar C. Three-quarter damage after installation. D. One-fourth-quarter A. Protected tubing Answer: (A) One-quarter B. Bare tubing C. Open tubing The space above a suspended ceiling shall not D. Unprotected tubing be included in calculating the permissible quantity of refrigerant in the system unless Answer: (D) Unprotected tubing such space is continuous and is part of the air return system Refers to blends comprising multiple components of different volatile that, when A. Partition used in refrigeration cycles, change B. Plenums volumetric composition and saturation C. Separator temperature as they evaporate (boil) or D. Plate divider condense at constant pressure. Answer: (B) Plenums A. Zeolite B. Blending Which of the following is not a possible C. Composition location of service valve? D. Zeotropic A. Suction of compressor Answer: (D) Zeotropic B. Discharge of compressor C. Outlet of liquid receiver Is a premises or that of a premise from which, D. Outlet of condenser because they are disabled, debilitated, or confined, occupants cannot readily leave Answer: (D) Outlet of condenser without the assistance of others A coil in series with evaporator that is use A. Institutional occupancy to prevent the liquid refrigerant entering the B. Public assembly occupancy compressor C. Residential occupancy D. Commercial occupancy A. Accumulator B. Liquid superheater Answer: (A) Institutional occupancy C. Drier loop D. Liquid suction heat exchanger Is one in which a secondary coolant is in direct contact with the air or other substance Answer: (C) Drier loop to be cooled or heated. A. Double indirect open spray system B. Indirect open spray system C. Indirect closed system D. Indirected, verted closed system Answer: (B) Indirect open spray system A type of valve connected from discharge of Pressure loss due to friction at the compressor directly to suction that is condenser, the compressor power per unit mass normally closed and will open automatically will only if there is high discharge pressure A. Increase A. Check valve B. Decrease B. Solenoid valve C. Remains the same C. King valve D. None of these D. Relief valve Answer: (C) Remains the same Answer: (B) Solenoid valve Which of the following is NOT a type of air- Use to increase the capacity of condenser cooled condenser? A. Water regulating valve A. Shell and tube B. Desuperheating coils B. Natural draft C. Liquid-suction heat exchanger C. Forced draft D. Condenser heating coils D. Induced draft Answer: (B) Desuperheating coils Answer: (A) Shell and tube Is use to subcooled the refrigerant from the A type of refrigerant control typically used condenser in household refrigeration A. Liquid line A. Thermostatic expansion valve B. Condenser subcooler B. Automatic expansion valve C. Desuperheating coils C. Capillary tube D. Liquid receiver D. High side float Anwser: (A) Liquid line* Answer: (C) Capillary Tube Which of the following is NOT a part of low Type of condenser that operates like a cooling pressure side in refrigeration system? water A. Compressor A. Air-cooled condenser B. Condenser B. Evaporative condenser C. Liquid line C. Shell and tube condenser D. Suction line D. Water cooled condenser Answer: (D) Suction Line Answer: (B) Evaporative condenser Which of the following is NOT a part of The major problem of heat pump is condensing unit? A. Refrigerant used A. Compressor B. Outside air B. Discharge line C. Supply air C. Condenser D. Frosting D. Liquid line Answer: (D) Frosting Answer: (D) Liquid line Dominant refrigerant used in commercial By subcooling the refrigerant in refrigeration refrigeration system system, the compressor power per unit mass will A. R11 B. R22 A. Increase C. R12 B. Decrease D. R502 C. Remains the same D. None of these Answer: (D) R502 Answer: (C) Remains the same Cascade refrigerant system are connected in Superheating the refrigerant in refrigeration A. Series system, the specific volume at compressor B. Parallel suction will C. Series-parallel D. Parallel A. Increase B. Decrease Answer: (A) Series C. Remains the same D. None of these Is use to heat up the solution partially before entering the generator in absorption Answer: (C) Remains the same refrigeration system By subcooling the refrigerant in refrigeration A. Rectifier system, the specific volume at compressor B. Absorber suction will C. Regenerator D. Pump A. Increase B. Decrease Answer: (C) Regenarator C. Remains the same D. None of these Answer: (C) Remains the same The COP of actual absorption refrigeration Answer: (C) Magnesium system is usually Are suitable for use in ammonia system A. Less than 1 B. Less than 2 A. Copper C. Less than 3 B. Aluminum and its alloy D. Less than 4 C. Plastic D. Cast iron Answer: (A) Less than 1 Answer: (B) Aluminum and its alloy Sight glass is often located at In a pressure-relief device is used to protect A. Discharge line a pressure vessel having an inside dimension B. Liquid line of 6 in or less, the ultimate strength of the C. Between condenser and liquid receiver pressure vessel so protected shall be D. Suction line sufficient to withstand a pressure at least ____ the design pressure Answer: (B) Liquid line A. 2 times Use to detects a vibration in current caused B. 3 times by the ionization of decomposed refrigerant C. 4 times between two opposite charged platinum D. 5 times electrodes Answer: (B) 3 times A. Electronic detector B. Halide torch Seats and discs shall be limited in C. Bubble method distortion, by pressure or other cause, to set D. Pressurizing pressure change of not more than ____ in a span of five years. Answer: (A) Electronic detector A. 1% The ability of oil to mix with refrigerants B. 5% C. 10% A. Carbonization D. 50% B. Purging C. Mixing Answer: (B) 5% D. Miscibility Liquid receivers, if used or parts of a system Answer: (D) Miscibility designed to receive the refrigerant change during pumpdown charge. The liquid shall not Joints and all refrigerants-containing parts occupy more than __of the volume when of a refrigerating system located in an air temperature of the refrigerant is 90F duct carrying conditioned air to and from an occupied space shall be constructed to A. 80% withstand a temperature of ____ without B. 85% leakage into the airstream. C. 90% D. 95% A. 550F B. 600F Answer: (C) 90% C. 650F D. 700F The discharge line (B4) shall be vented to the atmosphere through a ____ fitted to its upper Answer: (D) 700F extremity. Refrigerant piping crossing an open space that A. Nozzle affords passageway in any building shall be B. Convergent-divergent nozzle not loss than ______ above the floor unless C. Pipe the piping is located against the ceiling of D. Diffuser such space and is permitted by the authority having jurisdiction Answer: (D) Diffuser A. 2.2 m Convert fossil fuels into the shaft work B. 3.2 m C. 4.2 m A. Nuclear power plant D. 5.2 m B. Gas turbine power plant C. Dendrothermal power plant Answer: (A) 2.2m D. Thermal power plant Methyl chloride shall not be in contact with Answer: (D) Thermal power plant A. Aluminum Ultimate strength drops by 30% as steam B. Zinc temperature raises from ____ for unalloyed C. Magnesium steel D. All of these A. 300 to 400 C Answer: (D) All of these B. 400 to 500 C C. 600 to 700 C Shall not be in contact with any halogenated D. 700 to 800 C refrigerants Answer: (B) 400 to 500 C A. Aluminum B. Zinc C. Magnesium D. All of these Recent practice limits steam temperature to C. Steam turbine D. Passout turbine A. 438 C B. 538 C Answer: (D) Passout turbine C. 648 C D. 738 C Which of the following is used for binary cycle power generation for high temperature Answer: (A) 438 C application? In a closed feed water heater, the feed water A. Mercury pass through B. Sodium C. Potassium A. Inside the tube D. All of these B. Outside the tube C. Inside the shell Answer: (D) All of these D. Outside the shell Critical temperature of mercury is Answer: (A) Inside the tube A. 1160 c Is use if extracted steam upon condensation B. 1260 c gets subcooled C. 1360 c D. 1460 c A. Trap B. Deaerator Answer: (D) 1460 C C. Filter D. Drain cooler Critical pressure of mercury is Answer: (D) Drain cooler A. 100 MPa B. 108 Mpa Needs only single pump regardless of number of C. 128 Mpa heaters D. 158 MPa A. Open heater Answer: (B) 108 Mpa B. Closed heater C. Mono heater Method used in converting heat directly to D. Regenerative heater electricity by magnetism Answer: (B) Closed heater A. Electromagnetic induction B. Magnetodynamic Is also known as deaerator C. Magnetohydrodynamic D. Thermoelectric A. Open heater B. Closed heater Answer: (C) Magnetohydrodynamic C. Reheat heater D. Regenerative heater Which of the following is not a material used for thermoelectric elements Answer: (A) Open Heater A. Bismuth telluride Dissolve gases like _____ makes water B. Lead telluride corrosive react with metal to form iron oxide C. Zinc telluride D. Germanium A. O2 and N2 B. O2 and CO Answer: (C) Zinc telluride C. O2 and CO2 D. N2 and SO2 A type of coal formed after anthratice Answer: (C) O2 and CO2 A. Lignite B. Bituminous A cycle typically used in paper mills, textile C. Peat mills, chemical factories, sugar factories and D. Graphite rice mills Answer: (D) Graphite A. Cogeneration cycle B. Combined cycles Which of the following is lowest grade of C. By-products cycle coal? D. Cascading cycle A. Peat Answer: (A) Cogeneration cycle B. Lignite C. Sub- bituminous When process steam is basic need and power is D. Bituminous byproduct, this cycle is known as Answer: (B) Lignite A. Cogeneration cycle B. Combined cycles Which of the following helps in the ignition C. By-product cycle of coal? D. Cascading cycle A. Moisture Answer: (C) By-product cycle B. Ash C. Fixed carbon A type of turbine employed where steam D. Volatile matter continuously extracted for process heating Answer: (D) Volatile matter A. Back-pressure turbine B. Gas turbine Is the ratio of fixed carbon and volatile Reduces the steam temperature by spraying low matter. temperature water from boiler drum. A. Air-fuel ratio A. Reheater B. Fuel ratio B. Preheater C. Combustion ratio C. Desuperheater D. Carbon-volatile ratio D. Superheater Answer. (B) Fuel ratio Answer. (C) Desuperheater A suspension of a finely divide fluid in Carbon dioxide can be removed by: another. A. Deaeration A. Filtration B. Aeration B. Floatation C. Evaporation C. Emulsion D. Vaporization D. Separation Answer. (B) Aeration Answer. (C) Emuslion Is often used to absorb silica from water. Contains 90% gasoline and 10% ethanol. A. Sorbent B. Rectifier A. Gasohol C. Silica gel B. Gasonol D. Magnesium hydroxide C. Gasothanol D. Gasethanol Answer. (D) Magnesium hydroxide Answer: (A) Gasohol Presence of excess hydrogen ions makes the water Process used commercially in coal liquefaction. A. Acidic B. Alkalinity A. Tropsch process C. Base B. Fisher process D. Hydroxicity C. Fisher-tropsch process D. Mitch-tropsch process Answer. (A) Acidic Answer. (C) Fisher-tropsch process PH of water varies with A. Pressure Is an organic matter produced by plants in B. Temperature both land and water. C. Density D. Volume A. Bio-ethanol B. Biomass Answer. (B) Temperature C. Petroleum D. Biogradable Ph value of ______ is usually maintained for boiler water to minimized corrosion. Answer. (B) Biomass A. 8.5 In thermal power plant, induced draft fans are B. 9.5 located at the C. 10.5 D. 11.5 A. Exit of furnace B. Foot of the stack Answer. (C) 10.5 C. Above the stack D. Top of the stack What type of turbine that has a degree of reaction of ½? Answer: (B) Foot of the stack A. Impulse turbine In thermal power plant, forced draft fans are B. Reaction turbine installed at the C. Rarsons turbine D. Deriaz turbine A. Foot of the stack B. Top of the stack Answer. (C) Rarsons turbine C. Exit of the preheater D. Inlet of the preheater Tranquil flow must always occur Answer: (D) Inlet of the preheater A. Above the normal depth B. Above the critical depth Known as drum less boiler. C. Below the normal depth D. Below the critical depth A. La Mont boiler B. Fire tube boiler Answer. (B) Above the critical depth C. Force circulation boiler D. Once-through boiler Which of the following head loss coefficient among the following types of entrance? Answer: (D) Once-through boiler A. Bell mouth B. Square edge C. Reentrant D. It depends Answer. (C) Reentrant What waste treatment method involves of algae When the valve in steam engine is in mid- from stabilization pond effluents? position of its travel, it will cover the steam port by an amount known A. Sedimentation B. Floatation A. Steam lap C. Filtration B. Partial lap D. Microscreening C. Full lap D. Angular lap Answer. (D) Microscreening Answer. (A) Steam lap The number of nozzles will depend on the quantity of steam required by the turbine. If A type of governor in steam engine that do not nozzles occupy the entire ….. the ring, the control the actual admission of steam to the turbine is said to have: cylinder but controls the pressure of the steam. A. Partially full peripheral admission B. One-half peripheral admission A. Flyball governor C. Maximum peripheral admission B. Variable cut-off governor D. Full peripheral admission C. Throttling governor D. Shaft governor Answer. (D) Full peripheral admission Answer. (C) Throttling governor Tandem compound units may also have two low- pressure castings that produces: By inter-cooling using two stage compressor of Brayton cycle, the backwork ratio will: A. Single flow B. Double flow A. Increase C. Triple flow B. Decrease D. Quadruple flow C. Remains constant D. None of these Answer. (C) Triple flow Answer. (B) Decrease A type of turbine used for driving pumps, fans, and other auxiliaries in power plant On dynamic similitude, the relation which commonly operate at exhaust pressure represents the ratio of inertia force to approximating atmospheric. pressure force is: A. Tandem compound turbine A. Froude number B. Passout turbine B. Cauchy number C. Cross-compound turbine C. Euler number D. Back pressure turbine D. Reynolds number Answer. (D) Back pressure turbine Answer. (C) Euler number A governor with 0% regulation is termed as: What is the maximum velocity in a sewer A. Isochronous governor flowing full? B. Synchronous governor C. Isenchronous governor A. 0.6 m/sec D. Isobarnous governor B. 0.9 m/sec C. 1.2 m/sec Answer. (A) Isochronous governor D. 1.8 m/sec The speed regulation for most turbine- Answer. (A) 0.6 m/sec generators is adjustable from: A temporary structure constructed to exclude A. 2 to 6% water from the side of the foundation during B. 4 to 8% its excavation and construction is called. C. 6 to 10% D. 8 to 12% A. Calsson B. Retaining wall Answer. (A) 2 to 6% C. Coffer dam D. Earth dam Poppet valves of steam turbine are used for extraction pressure of: Answer. (C) Coffer dam A. 20 to 120 psig Which is not a physical characteristic of B. 20 to 150 psig water? C. 20 to 130 psig D. 20 to 140 psig A. Total suspended and dissolve solids B. Tubidity Answer. (B) 20 to 150 psig C. Color D. Hardness When both bearings of steam engines are on one side of the of the connecting rod, the engine Answer. (D) Hardness is referred to as: Which dam is best for weak foundation? A. Center-crank engine B. Side crank engine A. Gravity C. Under crank engine B. Arch D. Standard crank engine C. Buttress D. Earth Answer. (B) Side crank engine Answer. (C) Buttress What is the volume of water which will drain Type of solid injection that use single pump freely from the aquifer? supplies fuel under high pressure to a fuel header. A. Specific yield B. Reservoir yield A. Common rail injection C. Safe yield B. Individual pump injection system D. Secondary yield C. Distributor system D. Single rail injection Answer. (A) Specific yield Answer: (A) Common rail injection What is the line defined by the water level in a group of artesian wells? Water flow in diesel engine that is caused by density differential. A. Water table B. Peizometric surface A. Thermosiphon cooling C. Specific yield B. Thermostat cooling D. All of the above C. Pressure water cooling D. Evaporative cooling Answer. (B) Peizometric surface Answer: (A) Thermosiphon cooling Select the one that is a positive indication of pollution of a river. Type of lubrication system in diesel engine in which oil from pump is carried to a separate A. Acidity storage lank outside the engine cylinder and B. Oxygen content used for high capacity engine. C. Chloride content D. Nitrite content A. Mist lubrication system B. Wet sump lubrication Answer. (C) Chloride content C. Splash system D. Dry sump lubrication system The cooling water is made to fall in series of baffles to expose large surface area for steam Answer: (D) Dry sump lubrication system led from below to come in direct contact. Produces extreme pressure differentials and A. Spray condenser violent gas vibration. B. Surface condenser C. Jet condenser A. Vibration D. Barometric condenser B. Detonation C. Explosion Answer: (D) Barometric condenser D. Knocking Show the variation of river flow (discharge) Answer: (B) Detonation with time In a spark ignition engine, detonation occurs A. Hydrograph near the ___________. B. Hyctograph C. Mass curve A. End of combustion D. Flow duration curve B. Middle combustion C. Beginning of combustion Answer: (A) Hydrograph D. Beginning of interaction Is an open channel erected on a surface above Answer: (A) End of combustion the ground. In a compression ignition engine, the A. Canal detonation occurs near the ________. B. Tunnel C. Pentstock A. End of combustion D. Flume B. Middle of combustion C. Beginning of combustion Answer: (D) Flume D. Beginning of interaction Type of turbine used up to 300 m head Answer: (C) Beginning of combustion A. Impulse turbine B. Francis turbine Morse test is use to measure the _______ of C. Propeller turbine multi-cylinder engine. D. Deriaz turbine A. Break power Answer: (D) Deriaz turbine B. Indicated power C. Friction power Oil is atomized either by air blast or D. Motor power pressure jet at about Answer: (B) Indicated power A. 60 bar B. 70 bar Ignition delay can be min imized by adding C. 80 bar _________ to decrease engine knocking. D. 90 bar A. Ethel ether Answer: (B) 70 bar B. Ethyl chloride C. Ethyl nitrate D. Ethyl oxide Answer: (C) Ethyl nitrate At any point in fluid at rest, the pressure is The air that contains no water vapor is called the same in all directions. This principle is known as: A. Zero air B. Saturated air A. Bernoulli principle C. Dry air B. Archimedes principle D. Humid air C. Pascal’s law D. Torricelli’s law Answer: (C) Dry Air Answer: (C) Pascal’s law In psychrometric chart, the constant-enthalpy lines coincide with constant-temperature lines The hot-wire manometer is used to measure at temperature A. Pressure in gasses A. Above 50⁰C B. Pressure in fluids B. Below 40⁰C C. Wind velocities at airports C. Below 50⁰C D. Gas velocities D. Above 10⁰C Answer: (D) Gas Velocities Answer: (C) Below 50 C The pitot static tube measures The amount of moisture in air depend on its A. The static pressure A. Pressure B. The gage pressure B. Volume C. The total pressure C. Temperature D. The dynamic pressure D. Humidity Answer: (A) The static pressure Answer: (C) Temperature The terminal velocity of a small sphere The deep body temperature of healthy person is setting in a viscous fluid varies as the maintained constant at A. First power of its diameter A. 27⁰C B. Inverse of fluid viscosity C. Inverse square of the diameter B. 37⁰C D. Inverse of the diameter C. 47⁰C D. 48⁰C Answer: (B) Inverse of fluid viscosity Answer: (B) 37 C Pressure drag results from Air motion also plays important role in A. Skin friction A. Surroundings B. Deformation drag B. Cooling C. Breakdown of potential flow near the C. Human comfort forward stagnation point D. None of these D. Occurrences of wake Answer: (C) Human Comfort Answer: (A) Skin friction During simple heating and cooling process has The pressure coefficient is the ratio of a ____ humidity ratio pressure forces to: A. Increasing A. Viscous forces B. Decreasing B. Inertia forces C. Constant C. Gravity forces D. None of these D. Surface tension force Answer: (C) Constant Answer: (B) Inertia forces The _____ follows a line of constant wet-bulb Which instruments is used to measure humidity temperature on the psychrometric chart. of the atmosphere continuously? A. Evaporative cooling process A. Barograph B. Condensive cooling process B. Thermograph C. Direct cooling process C. Hydrograph D. None of these D. Thermo-hydrograph Answer: (A) Evaporative cooling process Answer: (C) Hydrograph A vapor which is not about to condensate is Entrance losses between tank and pipe or called a losses through elbows, fittings and valves are generally expresses as a function of A. mixture of vapor and liquid B. critical vapor A. Kinetic energy C. Superheated vapor B. Pipe diameter D. None of these C. Friction factor D. Volume flow rate Answer: (C) Superheated vapor Answer: (A) Kinetic Energy Passing from the solid phase directly into The constant volume and constant pressure vapor phase is called specific heats are identical for A. Condensation A. compressible substance B. Fusion B. incompressible substance C. Sublimation C. compressible gas D. None of these D. none of these Answer: (C) Sublimation Answer: (B) Incompressible substance Robert Boyle observed during his experiments The velocity of fluid is zero at wall aand with a vacuum chamber that the pressure of maximum at the center because of the gases is inversely proportional to their A. velocity effect A. Temperature B. viscous effect B. Pressure C. temperature effect C. Volume D. none of these D. None of these Answer: (B) Viscous effect Answer: (C) Volume For steady flow devices, the volume of the ____ is energy in transition control volume is A. Heat A. increase B. Work B. decrease C. Power C. constant D. None of these D. none of these Answer: (A) Heat Answer: (C) Constant Is the mode of energy transfer between a solid Work done in turbine is ____ since it is done surface and the adjacent liquid or gas which by the fluid. is in motion, and it involves combine effects A. Positive of conduction and fluid motion. B. Negative C. Zero A. Conduction D. None of these B. Convection C. Radiation Answer: (A) Positive D. None of these Answer: (B) Convection Radiation is usually considered as A. Surface phenomenon B. Surface interaction C. Surface corrosion D. None of these Answer: (A) Surface phenomenon Work is ____ between the system and the surroundings. A. Work interaction B. Energy interaction C. Heat 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 B. Static equilibrium C. Dynamic equilibrium D. None of these Answer: (A) Quasi-equilibrium 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