PIPE ME 3 EXIT EXAM PDF

PIPE ME 3 EXIT EXAM D. Polytropic 9. A refrigeration system using r-22 has a capacity of 320 kW 1. What must be the temperature in F at which heat is of refrigeration. The evaporating temper...

PIPE ME 3 EXIT EXAM D. Polytropic 9. A refrigeration system using r-22 has a capacity of 320 kW 1. What must be the temperature in F at which heat is of refrigeration. The evaporating temperature is -10 °c and supplied to a Carnot engine if twice as much energy is the condensing temperature is 40 °c. Calculate the fraction delivered as work as rejected to the sink at 50°F. of vapour in the mixture before the evaporator. A. 1040 F Properties of r-22: B. 1070 F At - 10 °c; hg = 401.60 kJ/kg, hi = 188.43 kJ/kg C. 1060 F At 40 °c; hr = 249.69 kJ/kg D. 1050 F A. 0.235 2. Ethane, cho, is burnt with just twice the stoichiometric B. 0.129 amount of air. How much kilogram air is used to oxidize 6.5 C. 0.287 kg of fuel? D. 0.459 A. 208.21 kg 10. A coil has an inlet temperature of 609f and outlet of 90°f. B. 306.23 kg If the mean temperature of the coil is 110°f, find the coil C. 330.21 kg efficiency. D. 120.67 kg A. 0.4 3. Air taken from the atmosphere at 100 kPa B. 0.5 and 21°c is delivered to the air receiver at 690 kPa and 150°c C. 0.6 by means of a water jacketed reciprocating compressor. The D. 0.7 compressor has rated capacity of 0.15 m3/s free air. 11. In an air conditioning system, if the recirculated air is Determine the power required to compress the air. three times the outside air and the mass of supply air is 20 A. 34.94 kW kg/s, what is the mass of the outside air? B. 44.94 kW A. 6 kg C. 54.94 kW B. 5 kg D. 64.94 kW C. 4 kg 4. A rigid tank contains air at 550 kPa and 150 degree c. As a D. 3 kg result of heat transfer to the surroundings, the temperature 12. Determine the approximate load on a cooling tower if and pressure inside the tank drop to 65 degree c and 450 kPa the entering and leaving temperatures are 96° and 88°, respectively. Determine the boundary work done during the respectively and the flow rate of the water over the tower is process. 45 gpm. A. 12 ANS=0 A. 3000 btu /min B. 10 B. 3500 btu / min D. 5 C. 4000 btu /min 5. Superheated vapor behaves D. 4500 btu /min A. Just as gas 13. A rectangular duct has a dimensions of B. Just as steam 0.25 m by 1 m. Determine the equivalent diameter of the C. Just as ordinary vapor duct. D. Approximately as a gas A. 0.2 m 6. Which of the following provides the basis for measuring B. 0.3 m thermodynamic property of temperature? C. 0.4 m A. Zeroth law of thermodynamics D. 0.5 m B. First law of thermodynamics 14. Copra enters a dryer containing 60% water and 40% of C. Second law of thermodynamics solids and leaves with 5% water and 95% solids. Find the D. Third law of thermodynamics weight of water removed based on each pound of original 7. Which of the following is commonly used as liquid product. absorbent? A. 0.58 lb A. Silica gel B. 0.42 lb B. Activated alumina C. 0.36 16 C. Ethylene glycol D. 0.64 1b D. None of these 15. A two-stage compressor receives 0.35 kg/s of air at 100 8. In the polytropic process, Pn = constant, if ka and 269 k and delivers it at 5000 kPa. Find the heat the value of n is infinitely large, the process is transferred in the intercooler. A. Isobaric A. 80.5 kW B. Isometric B. 90.5 kW C. Isothermal C. 70.5 kW  D. 100.5 kW D. 2500 kJ/kg 16. The area of an indicator diagram taken off a four 23. An ocean thermal energy conversion power plant cylinder, single acting, four-stroke engine running at 5.5 generates 10,000 kW using a warm surface water inlet rev/s is 390 mm?. The length is 70 mm and the scale of the temperature of 26 deg c and a cold deep-water temperature indicator spring is 1 mm = 80 kPa. The diameter of the of 15 deg c. On the basis of a 3 deg c drop in the temperature cylinders is 150 mm and the stroke is 200 mm. What is the of the warm water ad 3 deg c rise in the temperature of the indicated power of the engine? cold water due to removal and addition of heat, calculate A. 17.33 kW the power required in kW to pump the cold deep-water to B. 19.22 kW the surface and through the system heat exchanger if the C. 32.22 kW required pumping pressure increase is 7 kPa. Assume a D. 13.32 kW Carnot cycle efficiency and density of cold water to be 1000 17. A diesel engine uses 30 tonnes of fuel per day when kg/ m3. developing 5,000 kW indicated power and 4,000 kW brake A. 250 kW power of the total heat supplied to the engine, 32 percent is B. 146 kW carried away by cooling water and 31 percent by exhaust C. 108 kW gases. Calculate the calorific value of the fuel in kJ/kg. D. 124 kW A. 49223 24. Our country is embarking into the use of renewable B. 42523 energy sources like wind power to save on its energy needs. C. 21415 Determine the maximum power in kW that may be derived D. 38919 from a 55 kph wind if the wind rotor to used has a blade 18. What is the developed boiler horsepower if the steam diameter of 32 m and the over-all conversion efficiency rate is 0.85 kg/s and the factor of evaporation is 1.25? maybe taken as 35%. A. 244.41 hp Average air pressure is 100 kPa and ambient temperature of B. 214.54 hp 32 °c must be assumed. C. 200.57 hp A. 573 D. 157.25 hp B. 1050 19. The heating value of fuel supplied in a boiler is 40,000 C. 504 kJ/kg. If the factor of evaporation is 1.10 and the actual D. 350 specific evaporation is 10, what is the efficiency of the 25. A 600 MW pwr nuclear plant uses 4% enriched uranium boiler? fuel and has a thermal efficiency of 36%. The burn up A. 64% allowed of the fissionable portion of the fuel is 20%. B. 25% Calculate how many metric tons of natural uranium is placed C. 56% in the reactor vessel for one year continuous operation. D. 62% Note: heating equivalent is 23,000 kW-hr/ g u235 20. Two boilers has capacities of 200 kg/hr and 250 kg/hr. If A. 57.44 150,000 kg of coal are supplied to two boilers, how many B. 24.66 days to consume the available fuel? C. 35.79 A. 13.89 days D. 79.35 B. 18.93 days 26. Air enters a nozzle steadily at 2.21 kg/ m3 and 30 m/s. C. 81.39 days What is the mass flow rate through the nozzle if the inlet D. 39.18 days area of the nozzle is 80 cm2? 21. A typical industrial fuel oil, cich32, has A. 0.7304 kg/s 25% excess air by weight. Assuming complete oxidation of B. 0.6304 kg/s the fuel, calculate the actual air-fuel ratio by weight. C. 0.5304 kg/s A. 18.39 D. 0.4304 kg/ s B. 53.22 27. A barometer can be used to measure an airplane's C. 13.67 altitude by comparing D. 32.65 the 22. In a geothermal power plant, the mass flow rate of barometric pressure at a given flying altitude to that on the ground water is 400 kg/s and the quality after throttling is ground. Compute the airplane's altitude if the pilot 20%. If the turbine power is 80 mw, what is the change in measures the barometric pressure at 700 mmg, the ground enthalpy of steam at the inlet and outlet of the turbine? reports it at 760 mmg, and the average air density is A. 1000 kJ/kg 1.19 kg/m3 and g = 9.8 m/s?. B. 1500 kJ/kg A. 686 m C. 2000 kJ/kg B. 786 m  C. 868 m A. 45.28 D. 668 m B. 18.38 28. The compression ratio of an ideal Otto cycle is 6.0. Under C. 28.48 the cold air standard assumption, compute the thermal D. 32.31 efficiency of the cycle? 37. A dual cycle has an initial temperature of A. 81.17 % 30 °C. The compression ratio is 6 and the heat addition at B. 51.17 % constant volume process is 600 KJ/kg. If cut-off ratio is 2.5, C. 61.17 % find the maximum temperature of the cycle. D. 71.17 % A. 7535.50 °C 29. The volumes of states 1, 2 and 3 of a diesel cycle are 300 B. 5245.50 °C cm3, 30 cm3 and 90 cm respectively. What is the efficiency C. 3365.50 °C if the heat input is 120 kWP D. 3535.50 °C A. 48.03 % 38. Carnot cycle A, B and C are connected in series so that B. 40.85 % the heat rejected from A will be the heat added to B and heat C. 46.35 % rejected from B will be added to C, each cycle operates D. 40.57% between 30 °C and 400 °C. If heat added to A is 1000 kw, find 30. Find the enthalpy of Helium if its internal energy is 200 the work output of C. KJ/kg A. 111.44 kW A. 333.42 kJ/ kg B. 222.44 kW B. 222.42 kJ/kg C. 333.44 kW C. 444.42 kJ/kg D. 444.44 kW D. 111.42 kJ/kg 39. A steam turbine receives 5,000 kg/hr of steam at 5 Mpa 31. Compute the mass of a 2 m3 propane at and 4000oc and velocity of 30 m/sec. It leaves the turbine at 280 kpa and 40°C. 0.06 Mpa and 85% quality and velocity of 15 m/ sec. A. 12.42 kg Radiation loss is 10,000 KJ/hr. Find he KW developed. B. 9.47 kg At 5 Mpa and 400°C: C. 39.2 kg hi = 3195.7 KJ/kg D. 13.24 kg S1 =6.6459 32. A 1 m x 1.5 m cylindrical tank is full of At 0.006 Mpa: oil with SG = 0.92. Find the force acting at he = 151.53 the bottom of the tank in dynes. hig = 2415.9 A. 406.33 × 106 dynes A. 4373.60 B. 306.33 x 106 dynes B. 3373.60 C. 106.33 × 106 dynes C. 2373.60 D. 206.33 × 106 dynes D. 1373.60 33. Find the pressure at the 100 fathom depth of water in 40. A 16,000KW geothermal plant has a generator efficiency kpag. and turbine efficiency of 90% and 80%., respectively if the A. 4,793.96 кра quality after throttling is 20% and each well discharges 400, B. 3,793.96 kpag 000 kg/hr, determine the number of wells are required to C. 2,793.96 kpag produce if the charge of enthalpy if the change of enthalpy D. 1,793.96 kpag at entrance and exit of turbine is 500KJ/kg. 34. A thermal power plant has a heat rate of A. 4 wells 11,363 Btu/kw-hr. Find the thermal efficiency of the plant. B. 3 wells A. 45 % C. 2.5 wells B. 40 % D. 2 wells C. 35 % 41. When 1 gram of sample of coal is placed in a crucible and D. 30 % heated 950°C and maintain at that temperature for 7 35. Convert 750°R to °K minutes there is a loss in weight due to elimination of: A. 316.667 A. volatile matter and moisture B. 616.667 B. ash C. 516.667 C. moisture content D. 416.667 D. carbon 36. An otto cycle has a compression ratio of 8. 42. A type of boiler used for duper critical pressure Find the pressure ratio during operation. compression. A. La Mont boiler  B. Once through-circulation boiler D. 635.57 C. Force circulation boiler 51. In Francis turbine, the pressure gage leading to the D. Natural circulation boiler turbine casing reads 380 Kpa. The velocity of water entering 43. Economizer in a water tube boiler is heated by: the turbine is 8 m/sec, if net head of the turbine is 45 m, find A. electric furnace the distance from center of spiral casing to the tailrace. B. electric current A. 3.5 m C. incoming flue gas B. 3.0 m D. outgoing flue gas C. 4.0 m 44. An engine-generator rated 9000 KVA at D. 5.0 m 80% power factor, 3 phase, 4160 V has an efficiency of 90%. 52. A Pelton type turbine has 25 m head friction loss of 4.5 If overall plant efficiency is 28%, what is the heat generated m. The coefficient of friction head loss (from Moorse) is by the fuel. 0.00093 and penstock length of 80 m. What is the penstock A. 25,714 KW diameter? B. 35,714 KW A. 1,973.73 mm C. 45.714 KW B. 5,124.73 mm D. 55,714 KW C. 3,425.73 mm 45. The indicated thermal efficiency of a two stroke diesel D. 1,355.73 mm engine is 60%. If friction power is 15% of heat generated, 53. In an 9,000 KW hydro-electric plant the over-all determine the brake thermal efficiency of the engine. efficiency is 88% and the actual power received by the A. 15 % customer is 110,000 KW-hrs for that day. What is the B. 25 % secondary power could this plant deliver during the entire C. 35 % day? D. 45 % A. 80,080 KW-hrs 46. If the pressure of a gas is constant the volume directly B. 58,960 KW-hrs proportional to the absolute temperature. C. 65,960 KW-hrs A. Boyle's law D. 70,960 KW-hrs B. Joule's law 54. The gas density of chimney is 0.75 kg/ m3 and air density C. Charles law of 1.15 kg/m. Find the driving pressure if the height of D. Kelvin's law chimney is 47. The number of proTONs in the nucleus of an atom or the 63.71 m. number of electrons in the orbit of an atom. A. 0.15 kpa A. Atomic volume B. 0.25 kpa B. Atomic number С. 0.35 kpa C. Atomic weight D. 0.45 kpa D. Atomic mass 55. A turbo-charged, 16 cylinder, Vee-type diesel engine has 48. Which of the process that has no heat transfer? an air consumption of 3,000 kg/hr per cylinder at rate load A. Reversible isometric and speed. This air is drawn in through a filter by a B. Isothermal centrifugal compressor directly connected to the exhaust C. Polytropic gas turine. The temperature of the air from the compressor D. Adiabatic is 135C and a counter flow air cooler reduces the air 49. A diesel electric plant supplies energy for Meralco. temperature to 45C before it goes to the engine suction During a 24-hour period, the plant consumed 240 gallons of heater. Cooling water enters air cooler at 30C and leaves at fuel at 28°C and produced 3930 KW-hr. Industrial fuel used 40C. Calculate the log mean temperature difference. is 28°API and was purchased at P30 per liter at 15.6°C. What A. 13.34C is the cost of the fuel be to produce one KW-hr? B. 33.34C A. P6.87 C. 43.34C B. P1.10 D. 23.34C C. P1.05 56. Determine the number of stages needed for a centrifugal D. P2.10 pump if it is used to deliver 50. The specific speed of turbine is 85 rpm and running at 400 gal/min of water and pump power of 15 450 rpm. If the head is 20 m and generator efficiency is 90%, Hp. Each impeller develops a head of 30 ft. what is the maximum power delivered by the generator. A. 4 stages A. 455.57 B. 5 stages B. 135.57 C. 6 stages C. 835.57 D. 5.5 stages 57. A vacuum pump is used to drain a flooded mine shaft of D. 730K 20°C water. The pump pressure of water at this temperature 63. Air at 300K and 200 kpa is heated at constant pressure is 2.34 KPa. The pump is incapable of lifting the water higher to 600K. Determine the change of internal energy. than 16 m. What is the atmospheric pressure? A. 215.58 KJ/kg A. 159.30kPa B. 225.58 KJ/kg B. 159.30psi C. 235.58 KJ/kg C. 159.30mmHg D. 245.58 KJ/kg D. 159.30torr 64. A 4m2 asphalt pavement with emissivity of 0.85 has a 58. A submersible, multi-stage, centrifugal deep well pump surface temperature of 50°C. 260 pm capacity is installed in a well 27 feet below the static Find the maximum rate of radiation that can be emitted water level and running at 3000 rpm. Drawdown when from the surface. pumping at rated capacity is 10 feet. The pump delivers the A. 2.098.32 watts water into a 25,000 gallons capacity overhead storage tank. B. 3.098.32 watts Total discharge head developed by pump, including friction C. 4.098.32 watts in piping is 243 feet. Calculate the diameter of the impeller D. 5.098.32 watts of this pump in inches if each impeller diameter developed 65. Helium gas is compressed in an adiabatic compressor a head of 38 ft. from an initial state of 14 psia and 50F to a final temperature A. 6.242 inches of 320°F in a reversible manner. Determine the exit pressure B. 2.425 inches of Helium. C. 5.452 inches A. 29.5 psia D. 3.708 inches B. 34.5 psia 59. The charge in a Diesel engine consists of C. 40.5 psia 18.34 grams of fuel, with lower heating value of 42,571 D. 42.5 psia KJ/kg, and 409 grams of fuel and products of combustion. At 66. If the initial volume of an ideal gas is compressed to one- the beginning of compression, ti = 60°C. Let rk = 14. For half its original volume and to twice its temperature, the constant Cp = 1.11 KJ/kg-C, what should be pressure: the cut-off ratio in the corresponding ideal A. Doubles cycle? B. Quadruples A. 2.97 C. Remains constant B. 3.23 D. Halves C. 5.53 67. Is the most common dryer used which consist of rotating D. 4.55 cylinder inside which the materials flow while getting in 60. The gain of entropy during isothermal nonflow process contact with hot gas. of 5 lb of air at 60°F is 0.462 A. Tower dryer Btu/R. Find the Vi/V2. B. Centrifugal dryer A. 0.259 C. Trey dryer B. 0.529 D. Rotary dryer C. 0.925 68. Which of the following is the chemical formula of D. 0.592 ethanol? 61. An auditorium seating 1500 people is to be maintained A. C7H16 at 80°F dry bulb and 85°F wet bulb temperature when в. С2Н60 outdoor air is at 91°F C. C7H8 dry bulb and 75°F wet bulb. Solar heat load is 110,000 Btu/hr D. C6H12 and supply air at 60°F, determine the amount of supply air. 69. Reheating process in Brayton cycle, the turbine work will A. 31,422.17 1b/hr A. Increases B. 93,229.17 1b/hr B. Decreases C. 53,144.17 1b/hr C. Remains the same D. 75,425.17 1b/hr D. None of these 62. In a Brayton cycle that operates between temperature 70. When Rankine cycle is modified with regeneration, limits of 300K and 1773K wit k = 1.4, determine the which of the following will increase? temperature at the end of the compression (isentropic) for A. turbine work maximum work of the cycle. B. heat added A. 800K C. heat rejected B. 830K D. cycle efficiency C. 700K 71. A device that violates the second law of thermodynamics an input of 4 hp. If the same installation 15,000 fm are is called desired, what will be the new speed, A. Perpetual motion machine of second kind A. 450 rpm B. perpetual motion machine of third kind* B. 500 pm C. perpetual motion machine of the first kind C. 600pm D. none of these D. 550 pm 72. Using monoatomic gas, the thermal efficiency of Otto 81. A Carnot cycle operates between -8 °c and 28 °c. Find the cycle coefficient of performance. A. Increases A. 8.13 B. Decreases B. 6.54 C. remains constant C. 7.36 D. none of these D. 5.23 73. In diesel engine, combustion process during combustion 82. A refrigerating system operates on the reversed Carnot occurs during cycle. The higher temperature of the refrigerant in the A. isothermal process system is 120 of and the lower is 10 °f. The capacity is 20 B. constant pressure process TONs. Neglect losses. Determine the network in TONs of C. isentropic process refrigeration. D. adiabatic A. 120 74. If the cutoff ratio decreases, the efficiency B. 220 of diesel cycle C.320 A. Increases D. 420 B. Decreases 83. Determine the heat extracted from 2000 kg of water C. remains constant from 25 °c to ice at - 10 °c. D. none of these A. 921220 kJ 75. The use of regenerator in is recommended only when the B. 821220 kJ turbine exhaust temperature is higher than the compressor. C. 721220 kJ A. exit temperature D. 621220 kJ B. inlet temperature 84. An ice plant produces 20 TONnes of ice per day at -15 ° C. mean temperature from water at 25 °c, if miscellaneous losses are 10% of the D. absolute temperature chilling load, calculate the refrigeration capacity of the plant 76. As the number of stages is increased, the expansion in TONs of refrigeration. process becomes A. 40.12 TOR A. Isentropic B. 31.69 TOR B. Isothermal C. 42.67 TOR C. Isometric D. 65.32 TOR D. Polytropic 85. A creamery must cool 20,000 liters of milk received each 77. The fact the total energy in any one energy system day from initial temperature of 29 °c to a final temperature remains constant is called the principle of of 2 °c in 5 hours. If refrigeration losses amount to 10 percent A. Conservation of Energy of the cooling load, what must be the capacity of the B. Second Law of Thermodynamics refrigerating machine? C. Conservation of Mass Note: specific heat of milk is 3.9 kJ/kg-k and s.g. = 1.05. D. Zeroth Law of Thermodynamics A. 53.7 TOR 78. The function of a pump and compressor is to B. 24.5 TOR A. transfer heat from one fluid to another C. 96.2 TOR B. increase the total energy content of the flow D. 38.4 TOR C. extract energy from the flow 86. A san miguel corporation processing plant that requires D. exchange heat to increase energy to the flow cooling of 120 gom of water from 15.6 °c to 10 °c, assume 79. This law states that 'all energy received as heat by a heat- that the cooler heat transfer surface area will enable a 5.5 °c engine cannot be converted into mechanical work' differential between the chilled water leaving the cooler and A. 1st law of thermodynamics the r-12 evaporating temperature. Also assume that the B. 2nd law of thermodynamic condenser heat transfer surface area will enable a 5.5 °c C. 3rd law of thermodynamic differential between the condenser water out and r-12 D. all of the above condensing temperature. Water be available for the 80. A certain fan delivers 12,000 fm at a static pressure of 1 condensing medium at 29.4 in. Wg when operating at a speed of 400 rpm and requires ° inlet and 35 °c outlet. Assume no liquid subcooling or A. -40 suction gas superheating. Find the TONs of refrigeration. B. -50 A. 60.5 C. -60 B. 65.0 D. -70 C. 55.5 95. A 23 tons refrigeration system has a heat rejected of 100 D. 50.5 kw. Find the energy efficiency ratio of the system. 87. This is the ratio of the heat equivalent of the brake or A. 34.42 useful horsepower developed by an engine and available on B. 24.42 its crankshaft to the heat during the same time C. 14.42 A. brake engine efficiency D. 44.42 B. indicated thermal efficiency 96. A 200 mm × 250 mm, 8-cylinder, 4-stroke diesel engine C. combined thermal efficiency has a brake power of 150 kw. The mechanical efficiency is D. brake thermal efficiency 80%. If two of the cylinders were accidentally cut off, what 88. It is a commonly used device for measuring temperature will be the new friction power? differences or high temperatures. A. 37.50 kw A. Thermistor B. 47.50 kw B. Thermocouple C. 57.50 kw C. bimetallic strip D. 67.50 kw D. mercury in glass 97. An air compressor has a power of 40 kw at 4 % clearance. 89. The rate of doing work per unit time If clearance will increase to 70 %, what is the new power? A. torque A. 34 kw B. power B. 40 kw C. energy C. 44 kw D. momentum D. 23 kw 90. It has several functions. When necessary it empties the 98. Two kilogram of gas is confined in a 1 m3 boiler for cleaning, inspection, or repair. It blows out mud tank at 200 kpa and 88°C. What type of gas is in the tank? scale, or sediment when the boiler is in operation and A. Ethane prevents excessive concentration of soluble impurities in the B. Methane boiler C. Butane A. blow-down line D. Septane B. boiler feedwater pump 99. A fuel pump is delivering 1 bb1 per minute of oil with a C. steam valve specific gravity of 0.83. The total head is 9.14 m, find how D. none of the above much energy does the pump consumes in kJ per hour. 91. Is a feedwater preheating and waste heat recovery A. 710 device which utilizes the heat of the flue gases B. 610 A. Economizer C. 510 B. open heater D. 410 C. closed heater 100. A four cylinder, 4-stroke cycle, 20 cm x D. waterwalls 25 cm x 550 rpm diesel engine has a mean effective pressure 92. Which of the following statements is/are true with of 150 psi. Calculate the brake power in kW if engine regards to heat and work. efficiency is 88%. A. heat and work are both transient phenomena A. 135 kW B. both heat and work are boundary phenomena B. 133 kW C. both heat and work are path function C. 131 kW D. all of the above D. 129 kW 93. If the temperature in the icebox is too high, the trouble could be: A. a clogged scale trap B. air in the system C. automatic controls not functioning properly D. insufficient cooling water to the condenser 94. Two thermometers, one Celsius and the other Fahrenheit are both at the same temperature, and the reading on the Fahrenheit thermometer is exactly the same that on the Celsius thermometer, what is the temperature?