Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

2: The heat picked up in the evaporator must equal to

  • the heat giving by the condenser
  • the heat gained by the condenser
  • the heat lost by the medium being cooled
  • the heat of compression

3: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • low side of the system
  • the liquid side of the system
  • the vapor side of the system
  • high side of the system

4: Which creates more of a heat load?

  • 70% RH
  • 50% RH
  • 90% RH
  • 30% RH

5: The first step in mechanical refrigeration is

  • expansion
  • compression
  • evaporation
  • condensation

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

  • Hydrometer
  • Anemotherm
  • Anemometer
  • Velometer

7: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

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

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

9: If two 500 ohm resistors are connected in series, the resistance will be

  • 500 ohms
  • 20 ohms
  • 200 ohms
  • 1000 ohms

10: Where is the high-side float located on a chiller system?

  • inside the chiller barrel
  • flash line
  • discharge line
  • liquid line

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

  • When its white
  • 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

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

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

13: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • merge
  • purge
  • surge
  • splurge

14: 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

15: On a large centrifugal system, what meters the flow to the evaporator?

  • TXV
  • Low side float
  • High side float
  • Cap tube.

16: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • Because it's cheap
  • Because it's water
  • Because it's a non-flammable refrigerant
  • R-718 is not rated unlimited because it's a dangerous refrigerant

17: An oil pressure safety switch should be set at

  • 5 to 10 psi above low side pressure
  • 10-15 psi above low side pressure
  • 10 to 15 psi below low side pressure
  • 5 to 10 psi below low side pressure

18: What measures gas pressure?

  • Manometer
  • Barometer
  • Hygrometer
  • Hydrometer

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

  • 330 lbs
  • 500 lbs
  • 55 lbs
  • 660 lbs

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

21: What would be the classification for Stop & Shop grocery store?

  • Industrial
  • Place of assembly
  • Large mercantile
  • Instituional

22: Three-phase motors have what type of windings?

  • three run windings
  • one start winding and one run winding.
  • three start windings
  • three run windings and 3 start windings

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

  • Solenoid valve
  • EPR valve
  • EEV
  • CPR valve

24: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • blue
  • red
  • orange
  • green

25: Bubbles in the liquid line sight glass could be caused by

  • leaking discharge valves in the compressor
  • bad low pressure switch
  • plugged drier
  • overcharge of oil