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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?

Answer

Correct Answer: Blower

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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?

Answer

Correct Answer: Air Flow

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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?

Answer

Correct Answer: Areas

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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?

Answer

Correct Answer: Water

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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?

Answer

Correct Answer: Upflow

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36. How many Btu's are in an hour?

Answer

Correct Answer: 12,000

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37. What measurement describes the cooling capacity of a system?

Answer

Correct Answer: Tonnage

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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?

Answer

Correct Answer: Cold

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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?

Answer

Correct Answer: Setpoint

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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?

Answer

Correct Answer: A/C

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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?

Answer

Correct Answer: Scroll

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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?

Answer

Correct Answer: Rotors

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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?

Answer

Correct Answer: Two

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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?

Answer

Correct Answer: Products

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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?

Answer

Correct Answer: Moisture

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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?

Answer

Correct Answer: 60%

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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?

Answer

Correct Answer: Air

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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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