Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: R-123 belongs to Group

  • B-2
  • A-3
  • B-3
  • B-1

2: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will stop cooling and solution will crystallize
  • The machine will cool excessively as the solution evaporates
  • The machine will stop cooling and the solution will evaporate.
  • The machine will cool excessively as the solution crystallizes.

3: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class B machinery room
  • Class M machinery room
  • Class T machinery room
  • Class A machinery room

4: Low-side system leaks in a low-pressure chiller will often result in

  • nitrogen leaking out of the system.
  • water being pulled into the system
  • system refrigerant leaking from the system
  • air being pulled into the system

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

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

6: The discharge relief valve is located (9.4.6)

  • on top of the condensor
  • between the compressor and oil separator
  • between the compressor and reciever
  • between the compressor and the stop valve

7: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

8: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When there are sprinklers above
  • When it's used as part of a supply or return air system
  • When there is a space 6' or more above it
  • When its white

9: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 100
  • 80
  • 90
  • 110

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

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

11: A positive displacement compressor is

  • is a reciprocating type compressor with 2 or more pistons
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber

12: Suction line oil traps should be installed when the condenser is

  • on the third floor roof and the evaporator is in the basement
  • in the basement and the evaporator is on the third floor
  • located outside the operates in temperatures below 35F
  • more than 100' away from the evaporator

13: Pressure is equivalent of

  • Force / Area
  • Force
  • Force X Area
  • Area X Force

14: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

15: What is Absolute Zero?

  • -773F
  • -460F
  • -640F
  • -400F

16: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the aggregate of the high side and low side
  • the high side
  • the low side
  • 2.5 times the design pressure

17: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 80%
  • 100%
  • 90%
  • 75%

18: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

19: What is NOT a positive displacement compressor.

  • Centrifugal
  • Scroll
  • Reciprocating
  • Rotary

20: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

21: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection and a rupture disc
  • over pressure protection
  • over pressure protection as well as a temperature protection device

22: 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

23: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

24: Fusible plugs shall not be used with pressure vessels of

  • 3 cubic feet or less
  • 15 square feet or less
  • 3 cubic feet or more
  • 15 cubic feet or more

25: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above