Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which refrigerant is lighter than air?

  • R-11
  • R-717
  • R-123
  • R-134a

2: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

3: On a pumpdown system, the liquid-line solenoid is controlled by the

  • low-ambient controller
  • low pressure switch
  • defrost timer
  • thermostat

4: "P" represents ______ in the Watt's law formula

  • amperage
  • watts
  • voltage
  • reactance

5: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 5KW
  • 746 watts
  • 600 watts
  • 1000 watts

6: Total heat of a substance is considered

  • empathetical
  • sensible heat
  • enthalpy
  • specific heat

7: What do you need to do when you install a new system?

  • Add refrigerant
  • Document the superheat and subcooling reading
  • Insulate the suction line before you take a superheat reading
  • Have it inspected

8: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

9: How are a compressor and condenser fan wired?

  • parallel-series
  • series
  • parallel
  • series-parallel

10: The boiling point of a refrigerant is based on

  • Temperature
  • Heat content
  • a pressure-temperature relationship
  • None of the above.

11: What is the typical air conditioning operating pressures for R-22?

  • 60 psi suction 210 psi discharge
  • 25 psi suction 125 psi discharge
  • 105 psi suction 340 psi discharge
  • None of the above

12: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

13: What is the refrigerant dichlorodifluoromethane?

  • R-134A
  • R-12
  • R-123
  • R-22

14: How many different groups of refrigerants are there?

  • 3
  • 15
  • 7
  • 11

15: Transformers are rated in

  • volts
  • volt-amps
  • amps
  • volts-ohms

16: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

17: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • commercial occupancy
  • institutional occupancy
  • illegal occupancy
  • public assembly occupancy

18: Which is considered the more efficient condenser?

  • water cooled
  • fan cooled
  • air cooled
  • spray cooled

19: In an A/C unit, dirty filters will cause

  • high discharge pressure
  • low suction pressure
  • high suction pressur
  • low oil pressure

20: R-11 has the greatest corrosive effect on

  • Magnesium
  • Copper
  • Bronze
  • Aluminum

21: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • nearly the same
  • 2F difference
  • a ling psychrometer doesn't have two theremometers.
  • far apart or greater difference

22: A movie theater would be considered a

  • commercial occupancy
  • mixed occupancy
  • public assembly occupancy
  • institutional occupancy

23: Excessive head pressure is often caused by

  • thermostat set too high
  • leaking reed valve on the discharge side
  • insufficient refrigerant
  • air cooled condenser is plugged

24: What is the maximum voltage range allowed on an electrical circuit?

  • 20%
  • 15%
  • 5%
  • 10%

25: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • oil in evaporator
  • moisture in the system
  • low head pressure
  • not enough oil in the system