Refrigeration & Air Conditioning MCQ
1. The BTU is also used to measure the amount of heat required to what?
Answer
Correct Answer:
Raise the temperature of one pound of water by one degree
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2. What device moves air in a distribution system?
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3. What should a heat pump be operated at to make sure there is no supplemental electric resistance heat?
Answer
Correct Answer:
Balance Point
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4. What is the rating that denotes the efficiency of gas heating equipment?
Answer
Correct Answer:
Annual Fuel Utilization Efficiency
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5. What is the term for the portion of the central air conditioning or heat pump system that moves heated or cooled air throughout a home's ductwork?
Answer
Correct Answer:
Air Handler
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6. What is the movement of air called?
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7. What is an air distribution outlet designed to do?
Answer
Correct Answer:
Direct airflow into desired patterns
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8. What does the air diffuser direct airflow into?
Answer
Correct Answer:
Desired patterns
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9. What is the term for the outlet that directs air into desired patterns?
Answer
Correct Answer:
Air Diffuser
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10. What are the refrigerant lines typically piped to?
Answer
Correct Answer:
The air-cooled condenser
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11. What type of equipment is used to control equipment to vary the conditions of air temperature, relative humidity, and motion?
Answer
Correct Answer:
Air Conditioner
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12. What is the difference between air change and re-circulated air?
Answer
Correct Answer:
The amount of air required to completely replace the air in a room or building
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13. What term should not be confused with the amount of air required to completely replace the air in a room or building?
Answer
Correct Answer:
Re-circulated air
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14. What is not to be confused with re-circulated air?
Answer
Correct Answer:
Air Change
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15. What type of metering device feeds the proper amount of refrigerant into the evaporator?
Answer
Correct Answer:
Accurator
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16. What does the Accurator feed into the Evaporator?
Answer
Correct Answer:
Refrigerant
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17. What does the term absorption cycle mean?
Answer
Correct Answer:
Absorption chillers utilize a thermal or chemical process
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18. What is the purpose of zoning dampers?
Answer
Correct Answer:
Controlled by a thermostat
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19. What would be the purpose of a bypass damper?
Answer
Correct Answer:
Regulate static pressure
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20. What does zoning typically utilize?
Answer
Correct Answer:
System controller
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21. What does the system divide the air flow and temperature?
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22. What is the purpose of the Airex System?
Answer
Correct Answer:
Dividing and controlling the air flow and temperature of different areas
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23. What is used as a medium for heat transfer?
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24. How is the water being used as a medium for?
Answer
Correct Answer:
Heat transfer
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25. Water is piped to the unit from a cooling tower or other suitable source. Which component of the system is located inside the air conditioner?
Answer
Correct Answer:
The water-cooled condenser
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26. What type of air conditioning system uses freon as a refrigerant?
Answer
Correct Answer:
Water Cooled System
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27. What do ventilator's do?
Answer
Correct Answer:
Remove stale indoor air and make it up with fresh incoming air
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28. What kind of device moves air through or within a structure?
Answer
Correct Answer:
Ventilator
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29. What type of air may or may not be supplied to or removed from the space?
Answer
Correct Answer:
Conditioned
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30. What is the process of supplying or removing air?
Answer
Correct Answer:
Ventilation
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31. What kind of pump removes air, moisture, contamination and non-condensables?
Answer
Correct Answer:
Vacuum Pump
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32. What does an electric pump remove from a refrigeration system?
Answer
Correct Answer:
Air, moisture, contamination and non-condensables
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33. What is the name of the furnace that supplies air through the top and returns air from the bottom?
Answer
Correct Answer:
Upflow Furnace
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34. What does an air conditioning system use when it's designated as being of the upflow variety?
Answer
Correct Answer:
Top-mounted discharge plenum
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35. What is the designation of the type of air flow that an air conditioning system is designed for?
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36. How many Btu's are in an hour?
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37. What measurement describes the cooling capacity of a system?
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38. A temperature control device used to control what?
Answer
Correct Answer:
Refrigeration or heating system
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39. What is the term for the control device on a heating or refrigeration system?
Answer
Correct Answer:
Thermostat
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40. What is a property of matter that quantitatively expresses the common notions of hot and cold?
Answer
Correct Answer:
Temperature
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41. Low temperature objects are called what?
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42. What is the auxiliary or emergency heat usually a second stage of?
Answer
Correct Answer:
A heating system
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43. What is the process of superheating?
Answer
Correct Answer:
Creating a rise in temperature by adding heat energy to a refrigeration vapor
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44. What is the temperature of superheated vapor?
Answer
Correct Answer:
Beyond its saturation point
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45. What does the abbreviation superheated mean?
Answer
Correct Answer:
Refrigerant vapor heated beyond its saturation point
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46. What is the term for vapor heated beyond its saturation point?
Answer
Correct Answer:
Superheated Vapor
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47. What is a result of subcooling?
Answer
Correct Answer:
Creating a drop in temperature
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48. What is the process of subcooling?
Answer
Correct Answer:
Creating a drop in temperature by removing sensible heat from a refrigerant liquid
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49. What creates a drop in temperature by removing sensible heat from a refrigerant liquid?
Answer
Correct Answer:
Subcooling
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50. What are the components of a subcooler?
Answer
Correct Answer:
This is a section of some condensers
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51. What temperature can a liquid be cooled to before it's considered supercooled?
Answer
Correct Answer:
Below its saturation point
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52. Liquid refrigerant cooled below the point where what?
Answer
Correct Answer:
Saturation point
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53. What is another term for Split System?
Answer
Correct Answer:
Split System: A refrigeration or HVAC system consisting of two or more major components
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54. What is a single Package an air conditioning system that has all components encased in one unit?
Answer
Correct Answer:
A heating and air conditioning system
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55. What does the term setpoint mean?
Answer
Correct Answer:
The temperature to which a thermostat is set for desired comfort level
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56. What is the term for the temperature to which a thermostat is set for desired comfort level?
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57. What are the three types of heat?
Answer
Correct Answer:
Sensible heat
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58. What kind of system can remove heat from the air?
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59. What is the term for a system's capability to remove heat from the air?
Answer
Correct Answer:
Sensible Cooling Capacity
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60. How is the SEER rating calculated?
Answer
Correct Answer:
Specified federal test procedures
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61. What type of compressor is used to pump refrigerants?
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62. What type of compressor uses two interleaving scrolls?
Answer
Correct Answer:
Scroll compressor
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63. What is a scroll compressor used for?
Answer
Correct Answer:
Compressing refrigerant
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64. What type of compressor uses two helical screws?
Answer
Correct Answer:
Rotary Screw Compressor
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65. What is the term used for the two helical screws in a screw compressor?
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66. What is the purpose of a reversing valve?
Answer
Correct Answer:
To be used for cooling or heating
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67. What does the air drawn into a HVAC system do?
Answer
Correct Answer:
Air drawn into a HVAC system for conditioning and supply to the space to be conditioned
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68. Air drawn into a HVAC system for what purpose?
Answer
Correct Answer:
Conditioning and supply to the space to be conditioned
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69. What does the grille and damper assembly cover?
Answer
Correct Answer:
Air opening or end of an air duct
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70. What covering is used on an air opening or end of an air duct?
Answer
Correct Answer:
Combination grille and damper assembly
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71. What is the main component of an air conditioner?
Answer
Correct Answer:
Evaporator coil
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72. What are the two insulated copper tubes that connect an outdoor condensing unit to an indoor evaporator coil?
Answer
Correct Answer:
Refrigerant Line set
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73. How many copper tubes are in a refrigerant line?
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74. What is the name of the ozone depletion effect that has caused fluorocarbons to be phased out?
Answer
Correct Answer:
Chlorofluorocarbons
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75. What are some of the other common refrigerants used in various applications?
Answer
Correct Answer:
Ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as methane
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76. What is used in a heat cycle usually including a reversible phase change?
Answer
Correct Answer:
Refrigerant
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77. What type of compressor uses pistons driven by a crankshaft?
Answer
Correct Answer:
Reciprocating Compressor
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78. What type of compressor is a reciprocating compressor?
Answer
Correct Answer:
Positive-displacement
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79. Besides pistons, what does the reciprocating compressor use to deliver gas at high pressure?
Answer
Correct Answer:
Crankshaft
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80. What protection does a precision air conditioning system offer?
Answer
Correct Answer:
Mission-critical applications
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81. What is primarily designed for with Precision Air Conditioning systems?
Answer
Correct Answer:
Cooling electronic equipment
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82. What is a packaged unit?
Answer
Correct Answer:
A self-contained heating and/or air conditioning system
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83. What is a self-contained heating and/or air conditioning system called?
Answer
Correct Answer:
Packaged Unit
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84. How is a piece of air conditioning and heating equipment that includes all its components located?
Answer
Correct Answer:
In one cabinet
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85. What type of unit is the outdoor coil/condensing unit?
Answer
Correct Answer:
Heat pump or central air conditioning system
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86. The portion of a heat pump or central air conditioning system that is located outside the home and functions as a what?
Answer
Correct Answer:
A heat transfer point
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87. What is the part of a heat pump or central air conditioning system that is located outside the home?
Answer
Correct Answer:
Outdoor Coil/Condensing Unit
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88. What does a natural-draft furnace rely on?
Answer
Correct Answer:
Pressure created by the heat in the flue gases
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89. What type of furnace doesn't rely on mechanical systems?
Answer
Correct Answer:
Natural-Draft Furnace
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90. What is used to maintain precise control of temperature and humidity?
Answer
Correct Answer:
Microprocessor controls
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91. What are microprocessor controls commonly used on?
Answer
Correct Answer:
Modern precision air conditioning systems
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92. What is a system composed of?
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93. What is the heat energy required to change the state of a substance?
Answer
Correct Answer:
Latent Heat
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94. What is an A/C system's capability to remove?
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95. What is an A/C system's capability to remove moisture from the air?
Answer
Correct Answer:
Latent Cooling Capacity
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96. What is the name of the Integrally Controlled Motor?
Answer
Correct Answer:
ICM Motor
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97. Ow much of an efficiency rate do conventional motors have?
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98. Where does air usually infiltrate?
Answer
Correct Answer:
Air flow into a space usually through walls and leaks around doors and windows
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99. What type of flow is infiltration?
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100. What does the motor create to induce the gases?
Answer
Correct Answer:
Draft inducer
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101. What draws combusted gases and heat through the heat exchanger?
Answer
Correct Answer:
Induced Draft Furnace
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102. What type of coil is used in an air conditioner?
Answer
Correct Answer:
Indoor Coil
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Marine Engineering MCQs | Topic-wise