Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The evaporator is a device to

  • store liquid refrigerant
  • absorb heat into the refrigeration system
  • Keep the compressor busy
  • remove heat from the refrigeration system

2: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

3: Which of the following is NOT a positive displacement compressor?

  • screw
  • reciprocating
  • centrifugal
  • scroll

4: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

5: Which refrigerant replaced R-12?

  • R-22
  • R-134A
  • R-410A
  • R-407A

6: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 40% Li-Br, 60% distilled water
  • 60% Li-Br, 40% distilled water
  • 40% Li-Br, 60% tap water
  • 50% Li-Br, 50% tap water

7: Two systems using separate refrigerants that are superimposed upon one another is called

  • cascade
  • booster
  • indirect
  • single stage

8: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • R-718
  • ammonia
  • methyl chloride
  • trichlorotrifluoromethane

9: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 25
  • 66
  • 22

10: Cooling tower lowers condenser water temp by

  • condensation
  • evaporative cooling
  • running fans at 100%
  • running water thru a secondary heat exchanger

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

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

12: Which of the following is an example of an azeotropic refrigerant?

  • R-404A
  • R-500
  • R-410A
  • R-134A

13: If a low-pressure chiller has a low-side leak, which of the following will most likely result?

  • High head pressure and low suction pressure
  • High suction pressure and high discharge pressure.
  • Low suction pressure and low discharge pressure
  • Low head pressure and high suction pressure

14: What kind of material can't be used on the outlet of a relief valve?

  • Copper
  • PVC
  • Stainless Steel
  • Aluminum

15: 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)

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

16: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

17: R-22 is classified as a ____ refrigerant on the safety matrix.

  • A-1
  • A-2
  • B-1
  • B-2

18: In a system designed for sub-zero ambient temperatures, what must be added?

  • Booster compressor
  • Low-ambient kit
  • Infrared dye for leak identification
  • Nitrogen

19: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1.5
  • 1
  • 2.2
  • 1.2

20: The difference between saturated liquid and saturated vapor is

  • volume
  • pressure
  • heat
  • temperature

21: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

22: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • -40F to 0F
  • 0F-38F
  • -100F to -40F
  • 30F to 50F

23: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?

  • Solenoid valve
  • EEV
  • EPR valve
  • CPR valve

24: What is the minimum size wire you can use on a 30 amp circuit?

  • 16 AWG
  • 12 AWG
  • 14 AWG
  • 10 AWG

25: A micron is

  • one millonths of a centimeter
  • one thousandths of a millimeter
  • one millonths of a micrometer
  • a larger unit of measurement than Hg