Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What does safe access mean?

  • A clear unobstructed path to the equipment and controls
  • Locked doors
  • Well-lit exit signs
  • OSHA approved

2: Total heat of a substance is considered

  • specific heat
  • enthalpy
  • sensible heat
  • empathetical

3: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • the outdoors
  • the return air ducted system
  • the mechanical room housing the refrigeration system
  • Machinery rooms need not be vented

4: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Fan-like action
  • Suction and discharge valves
  • Rotating vanes
  • Nesting scrolls

5: A halide torch is most useful with a freon compression system

  • to detect refrigeration leaks in piping joints
  • to release a sticking valve
  • to sweat flanges on the refrigeration piping
  • to remove from from TXV's and evaporator coils

6: Increasing superheat will do what to your frost line?

  • Decrease
  • Nothing
  • Increasae
  • Could either increase or decrease depending on the load conditions

7: How many gallons of water do you need per pound of ammonia?

  • 100
  • 10
  • 1
  • 50

8: A start capacitor in series with a start winding will

  • decrease the amp draw of the motor
  • increase running efficiency
  • increase the amp draw of the motor
  • increase starting torque

9: Copper and its alloys shall not be used with ammonia

  • True
  • False

10: How many different groups of refrigerants are there?

  • 11
  • 3
  • 15
  • 7

11: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 1%
  • 4%
  • 2%
  • 25%

12: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 55 lbs
  • 550 lbs
  • 330 lbs.
  • 660 lbs

13: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

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

14: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • high pressure
  • design pressure
  • critical pressure
  • low pressure

15: What type of pressure relief device is used on a CO2 system?

  • Rupture disk
  • Gate valve
  • Fusible plug
  • Glove valve

16: Which of the following is not an air velocity meter?

  • Velometer
  • Anemometer
  • Anemotherm
  • Hydrometer

17: How would you know if there was a loss of crankcase pressure?

  • oil level will rise
  • oil will thicken
  • oil will foam
  • oil will thin out

18: Dual-pressure relief devices should be installed on

  • vessels of 3 cubic feet or more
  • vessels of 10 cubic feet or less
  • vessels of 10 cubic feet or more
  • vessels of 3 cubic feet or less

19: Pressure relief valves shall be marked with the data from

  • Section XIII Division of the ASME Boiler & Pressure Code
  • Section VIII Division of the ASME Boiler & Pressure Code
  • Section IV Division of the ASME Boiler & Pressure Code
  • Section I Division VIII of ASME Boiler & Pressure Code

20: What device should be used on low-temperature freezers?

  • discharge muffler
  • high capacity TXV
  • oil separator
  • hot-gas by-pass

21: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 24
  • 18
  • 10
  • 15

22: While the system is operating, the discharge line should be

  • at the same temperature as the crankcase
  • room temperature
  • too hot to hold by hand
  • 10-15F warmer than ambient

23: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • the same
  • there is no Group B1 refrigerants
  • lower
  • higher

24: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UR
  • UV or UR
  • UM or UL
  • UL and UM

25: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above