Pipe Elements No. 1 PDF

PIPE ELEMENTS NO. 1 1. Is the most common dryer used which consist of rotating C. Automatic expansion valve cylinder inside which the materials flow while getting in D. Capillary tube contact with hot gas. ANSWER: D A....

PIPE ELEMENTS NO. 1 1. Is the most common dryer used which consist of rotating C. Automatic expansion valve cylinder inside which the materials flow while getting in D. Capillary tube contact with hot gas. ANSWER: D A. Tower dryer 11. As a rule of thumb, for a specified amount of compressed B. Centrifugal dryer air, the power consumption of the compressor decreases C. Trey dryer by ______________ for each 3 deg C drop in the D. Rotary dryer temperature inlet air to the compressor. ANSWER: D A. 1 percent 2. Is the ratio of the mass of water-vapor in air and the mass B. 1.5 percent of air if it is saturated is called: C. 2 percent A. Humidity ratio D. 2.5 percent B. Mass ratio ANSWER: A C. Vapor ratio 12. Modern way of detecting air compressor leak is by using D. Relative humidity A. Soup and water ANSWER: D B. Air leak detector 3. The hands feel painfully cold when the skin temperature C. Acoustic leak detector reaches D. Ammonia leak detector A. 8 deg C ANSWER: C B. 10 deg C 13. For foundation of stacks, the maximum pressure on the soil C. 12 deg C is equal to the pressure due to the weight and the D. 14 deg C ___________. ANSWER: B A. Soil movement 4. The refrigerant used in steam jet cooling is: B. Wind movement A. Steam C. Ground movement B. R-11 D. Engine movement C. Ammonia ANSWER: B D. Water 14. Foundation bolts of specified size should be used and ANSWER: D surrounded by a pipe sleeve with an inside diameter of at 5. The total heat of the air is a function of least A. WB temperature A. 3 times the diameter of engine bolt B. DP temperature B. 2 times the diameter of engine bolt C. DB temperature C. 3 times the diameter of anchor bolt D. WB depression D. 2 times the diameter of anchor bolt ANSWER: A ANSWER: C 6. Boiling point of Freon-12 at atmospheric pressure is: 15. For multi stage compression of an ideal Brayton cycle, the A. 21 deg F back ratio will B. 15 deg F A. Increase C. 5 deg F B. Decrease D. 28 deg F C. Remains the same ANSWER: A D. None of these 7. Which of the following is NOT a type of water cooled ANSWER: B condenser in refrigeration? 16. Type of turbine that has a specific speed below 5. A. Double pipe A. Impulse turbine B. Double shell B. Propeller turbine C. Shell and coil C. Francis turbine D. Shell and tube D. Deriaz turbine ANSWER: B ANSWER: A 8. Component of absorption refrigeration system in which the 17. A high discharge type of turbine solution is cooled by cooling water. A. Impulse turbine A. Rectifier B. Propeller turbine B. Generator C. Francis turbine C. Evaporator D. Deriaz turbine D. Absorber ANSWER: B ANSWER: D 18. Use to minimize the speed rise due to a sudden load 9. Cascade refrigeration cycle is often used in industrial rejection process where objects must be cooled to temperature A. Needle valve below: B. Wicket gate shut-off A. -46 deg C C. Shut-off valve B. -56 deg C D. Jet deflector C. -66 deg C ANSWER: D D. -76 deg C 19. Is the speed of a turbine when the head on the turbine is ANSWER: A one meter 10. Type of refrigerant control designed to maintain a pressure A. Specific speed difference while the compressor is operating. B. Rated speed A. Thermostatic expansion valve C. Utilized speed B. Using low side float flooded system D. Unit speed  PIPE ELEMENTS NO. 1 ANSWER: D A. Increase 20. Is a fluid property which refers to the intermolecular B. Decrease attraction by which the separate particles of the fluid arc C. Remains the same held together. D. None of these A. Cohesion ANSWER: A B. Adhesion 30. By increasing the boiler pressure in Rankine cycle the C. Surface tension moisture content at boiler exit will. D. Hypertension A. Increase ANSWER: A B. Decrease 21. Which of the following is NOT the cause of black smoke in C. Remains the same diesel engine? D. None of those A. Fuel valve open too long ANSWER: A B. High compression pressure 31. Presently the highest steam temperature allowed at the C. Carbon in exhaust pipe turbine inlet is about ______. D. Overload on engine A. 340 deg C ANSWER: B B. 520 deg C 22. Which of the following is not a method of starting a diesel C. 620 deg C engine? D. 1020 deg C A. Manual: rope, crank and kick ANSWER: C B. Electric (battery) 32. Two most common gases employed in Stirling and Ericsson C. Compressed air cycles are. D. Using another generator A. Air and helium ANSWER: D B. Oxygen and helium 23. Two-stroke engine performs ________ to complete one C. Hydrogen and helium cycle. D. Nitrogen and helium A. Suction and discharge stroke ANSWER: C B. Compression and power stroke 33. In most common design of gas turbine, the pressure ratio C. Power and exhaust stroke ranges from D. Suction and exhaust stroke A. 10 to 12 ANSWER: B B. 11 to 16 24. A type of geothermal plant used when there is a presence C. 12 to 18 of brine extracted from underground D. 15 to 20 A. Dry geothermal plant ANSWER: B B. Double-flash geothermal 34. In brayton cycle, the heat is transformed during what C. Single flash geothermal plant process? D. Binary geothermal plant A. Constant temperature ANSWER: D B. Isentropic process 25. Is the most important safety device on the power boiler. C. Isobaric process A. Check valve D. Isochoric process B. Gate valve ANSWER: C C. Safety valve 35. The fuel injection process in diesel engine starts when the D. Globe valve piston ______ ANSWER: C A. Is at the TDC 26. During hydrostatic test, the safety valves should be B. Leaving TDC A. Removed C. Approaches TDC B. Open D. Halfway of the stroke C. Closed ANSWER: C D. Partially closed 36. If the cut-off ratio of diesel cycle increases, the cycle ANSWER: A efficiency will 27. Where deaerating heaters are not employed, it is A. Decrease recommended that the temperature of the feed water be B. Increase not less than ______ C. Remains the same A. 197 deg C D. None of these B. 102 deg C ANSWER: A C. 104 deg C 37. The fuel used in a power plant that is used during peak D. 106 deg C periods. ANSWER: A A. Gas 28. Is a reaction during which chemical energy is released in the B. Solid form of heat. C. Liquid A. Cosmic reaction D. None of these B. Ethnic reaction ANSWER: C C. Endothermic reaction 38. Typical compression ratio of Otto cycle is D. Exothermic reaction A. 6 ANSWER: D B. 8 29. By reheating the steam in an ideal Ranking cycle the heat C. 10 rejected will. D. 12  PIPE ELEMENTS NO. 1 ANSWER: B 48. Any device or portion of the equipment used to increase 39. If Joule Thomson coefficient is equal to zero, then the refrigerant pressure process will become A. Pressure relief device A. Isentropic B. Pressure-imposing element B. Isenthalpic C. Pressure lift device C. Isobaric D. Pressure limiting device D. Isothermal ANSWER: B ANSWER: D 49. The quantity of refrigerant stored at some point is the 40. If the fluid passed through a nozzle its entropy will: refrigeration system for operational, service, or standby A. Increase purposes. B. Decrease A. Pressure vessel C. Remains the same B. Pumpdown charge D. None of these C. Liquid receiver ANSWER: C D. Accumulator 41. Refrigerant consisting of mixtures of two or more different ANSWER: B chemical compounds, often used individuals as refrigerant 50. Secondary refrigerant is a liquid used for the transmission for other applications. of heat, without a change of state, and having no flash point A. Suspension or a flash point above ______ as determined from ASTM B. Compound reaction A. 150 F C. Blends B. 160 F D. Mixing of refrigerant C. 180 F ANSWER: C D. 200 F 42. Pairs of mating stop valves that allow sections of a system ANSWER: A to be joined before opening these valves or separated after 51. A service valve for dual pressure-relief devices that allows closing them using one device while isolating the other from the system, A. Check valve maintaining one valve in operation at all times. B. Gate valve A. Three-way valve C. Safety valve B. Two-way valve D. Companion valve C. One-way valve ANSWER: D D. Four-way valve 43. An enclosed passageway that limits travel to a single path. ANSWER: A A. Corridor 52. Tubing that is unenclosed and therefore exposed to B. Hallway crushing, abrasion, puncture, or similar damage after C. Lobby installation. D. Tunnel A. Protected tubing ANSWER: A B. Bare tubing 44. For immediate dangerous to life or health (IDHL), the C. Open tubing maximum concentration from which unprotected persons D. Unprotected tubing are able to escape within _____ without escape-impairing ANSWER: D symptoms or irreversible health. 53. Refers to blends comprising multiple components of A. 15 min different volatile that, when used in refrigeration cycles, B. 1 min change volumetric composition and saturation C. 20 min temperature as they evaporate (boil) or condense at D. 30 min constant pressure. ANSWER: D A. Zeolite 45. The volume as determined from internal dimensions of the B. Blending container with no allowance for the volume of internal C. Composition parts. D. Zeotropic A. Internal allowance ANSWER: D B. Internal gross volume 54. Is a premises or that of a premise from which, because they C. Internal interference volume are disabled, debilitated, or confined, occupants cannot D. Internal fits volume readily leave without the assistance of others ANSWER: B A. Institutional occupancy 46. A waiting room or large hallway serving as a waiting room B. Public assembly occupancy A. Terrace C. Residential occupancy B. Rest room D. Commercial occupancy C. Compound room ANSWER: A D. Lobby 55. Is one in which a secondary coolant is in direct contact with ANSWER: D the air or other substance to be cooled or heated. 47. A continuous and unobstructed path of travel from any A. Double indirect open spray system point in a building or structure to a public way B. Indirect open spray system A. Average of aggress C. Indirect closed system B. Mean of aggress D. Indirected, verted closed system C. Hallway of aggress ANSWER: B D. Pathway of aggress 56. Refrigerant number R-744 is ANSWER: B A. Butane  PIPE ELEMENTS NO. 1 B. Carbon monoxide B. Condenser subcooler C. Propane C. Desuperheating coils D. Carbon dioxide D. Liquid receiver ANSWER: D ANSWER: A 57. Refrigerant number R-1150 is 66. Which of the following is NOT a part of low pressure side in A. Propylene refrigeration system? B. Ethene A. Compressor C. Ethane B. Condenser D. Methyl formate C. Liquid line ANSWER: B D. Suction line 58. Refrigerant R-40 is ANSWER: C A. Chlorodifluoromethane 67. Which of the following is NOT a part of high pressure side B. Difluoromenthane in refrigeration system? C. Ammonia A. Compressor D. Chloromethane B. Condenser ANSWER: D C. Liquid line 59. When the air duct system serves several enclosed spaces, D. Suction line the permissible quantity of refrigerant in the system shall ANSWER: D not exceed the amount determined by using the total 68. Which of the following is NOT a part of condensing unit? volume of those spaces in which the airflow cannot be A. Compressor reduced to less than ____ of its maximum when the fan is B. Discharge line operating C. Condenser A. One-quarter D. Liquid line B. One half-quarter ANSWER: D C. Three-quarter 69. By subcooling the refrigerant in refrigeration system, the D. One-fourth-quarter compressor power per unit mass will ANSWER: A A. Increase 60. The space above a suspended ceiling shall not be included B. Decrease in calculating the permissible quantity of refrigerant in the C. Remains the same system unless such space is continuous and is part of the D. None of these air return system ANSWER: C A. Partition 70. Superheating the refrigerant in refrigeration system B. Plenums without useful cooling, the refrigeration effect per unit C. Separator mass will D. Plate divider A. Increase ANSWER: B B. Decrease 61. Which of the following is not a possible location of service C. Remains the same valve? D. None of these A. Suction of compressor ANSWER: C B. Discharge of compressor 71. By subcooling the refrigerant in refrigeration system, the C. Outlet of liquid receiver specific volume at compressor suction will D. Outlet of condenser A. Increase ANSWER: D B. Decrease 62. A coil in series with evaporator that is use to prevent the C. Remains the same liquid refrigerant entering the compressor D. None of these A. Accumulator ANSWER: C B. Liquid superheater 72. Pressure loss due to friction at the condenser, the C. Drier loop compressor power per unit mass will D. Liquid suction heat exchanger A. Increase ANSWER: C B. Decrease 63. A type of valve connected from discharge of compressor C. Remains the same directly to suction that is normally closed and will open D. None of these automatically only if there is high discharge pressure ANSWER: C A. Check valve 73. Which of the following is NOT a type of air-cooled B. Solenoid valve condenser? C. King valve A. Shell and tube D. Relief valve B. Natural draft ANSWER: B C. Forced draft 64. Use to increase the capacity of condenser D. Induced draft A. Water regulating valve ANSWER: A B. Desuperheating coils 74. A type of refrigerant control typically used in household C. Liquid-suction heat exchanger refrigeration D. Condenser heating coils A. Thermostatic expansion valve ANSWER: B B. Automatic expansion valve 65. Is use to subcooled the refrigerant from the condenser C. Capillary tube A. Liquid subcooler D. High side float  PIPE ELEMENTS NO. 1 ANSWER: C D. 700 F 75. Type of condenser that operates like a cooling water ANSWER: D A. Air-cooled condenser 85. Refrigerant piping crossing an open space that affords B. Evaporative condenser passageway in any building shall be not loss than ______ C. Shell and tube condenser above the floor unless the piping is located against the D. Water cooled condenser ceiling of such space and is permitted by the authority ANSWER: B having jurisdiction 76. The major problem of heat pump is A. 2.2 m A. Refrigerant used B. 3.2 m B. Outside air C. 4.2 m C. Supply air D. 5.2 m D. Frosting ANSWER: A ANSWER: D 86. Methyl chloride shall not be in contact with 77. Dominant refrigerant used in commercial refrigeration A. Aluminum system B. Zinc A. R11 C. Magnesium B. R22 D. All of these C. R12 ANSWER: D D. R502 87. Shall not be in contact with any halogenated refrigerants ANSWER: D A. Aluminum 78. Cascade refrigerant system are connected in B. Zinc A. Series C. Magnesium B. Parallel D. All of these C. Series-parallel ANSWER: C D. Parallel 88. Are suitable for use in ammonia system ANSWER: A A. Copper 79. Is use to heat up the solution partially before entering the B. Aluminum and its alloy generator in absorption refrigeration system C. Plastic A. Rectifier D. Cast iron B. Absorber ANSWER: B C. Regenerator 89. In a pressure-relief device is used to protect a pressure D. Pump vessel having an inside dimension of 6 in or less, the ANSWER: C ultimate strength of the pressure vessel so protected shall 80. The COP of actual absorption refrigeration system is usually be sufficient to withstand a pressure at least ____ the A. Less than 1 design pressure B. Less than 2 A. 2 times C. Less than 3 B. 3 times D. Less than 4 C. 4 times ANSWER: A D. 5 times 81. Sight glass is often located at ANSWER: B A. Discharge line 90. Seats and discs shall be limited in distortion, by pressure or B. Liquid line other cause, to set pressure change of not more than ____ C. Between condenser and liquid receiver in a span of five years. D. Suction line A. 1% ANSWER: B B. 5% 82. Use to detects a vibration in current caused by the C. 10% ionization of decomposed refrigerant between two D. 50% opposite charged platinum electrodes ANSWER: B A. Electronic detector 91. Liquid receivers, if used or parts of a system designed to B. Halide torch receive the refrigerant change during pumpdown charge. C. Bubble method The liquid shall not occupy more than ____ of the volume D. Pressurizing when temperature of the refrigerant is 90F ANSWER: A A. 80% 83. The ability of oil to mix with refrigerants B. 85% A. Carbonization C. 90% B. Purging D. 95% C. Mixing ANSWER: C D. Miscibility 92. The discharge line (B4) shall be vented to the atmosphere ANSWER: D through a ____ fitted to its upper extremity. 84. Joints and all refrigerants-containing parts of a refrigerating A. Nozzle system located in an air duct carrying conditioned air to and B. Convergent-divergent nozzle from an occupied space shall be constructed to withstand C. Pipe a temperature of ____ without leakage into the airstream. D. Diffuser A. 550 F ANSWER: D B. 600 F 93. Convert fossil fuels into the shaft work C. 650 F A. Nuclear power plant  PIPE ELEMENTS NO. 1 B. Gas turbine power plant C. Dendrothermal power plant D. Thermal power plant ANSWER: D 94. Ultimate strength drops by 30% as steam temperature raises from ____ for unalloyed steel A. 300 to 400 c B. 400 to 500 c C. 600 to 700 c D. 700 to 800 c ANSWER: B 95. Recent practice limits steam temperature to A. 438 C B. 538 C C. 648 C D. 738 C ANSWER: A 96. In a closed feed water heater, the feed water pass through A. Inside the tube B. Outside the tube C. Inside the shell D. Outside the shell ANSWER: A 97. Is use if extracted steam upon condensation gets subcooled A. Trap B. Deaerator C. Filter D. Drain cooler ANSWER: D 98. Needs only single pump regardless of number of heaters A. Open heater B. Closed heater C. Mono heater D. Regenerative heater ANSWER: B 99. Is also known as deaerator A. Open heater B. Closed heater C. Reheat heater D. Regenerative heater ANSWER: A 100. Dissolve gases like _____ makes water corrosive react with metal to form iron oxide A. O2 and N2 B. O2 and CO C. O2 and CO2 D. N2 and SO2 ANSWER: C