Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The principle used in continuous type absorption systems is

  • Ohm's Law
  • Dalton's Law
  • Boyle's Law
  • Charles's Law

2: The two float-type metering devices are the

  • high-side float and the low-side float
  • liquid float and the vapor float
  • vapor float and the low-side float.
  • liquid float and the low-side float

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

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

4: Where can 50/50 solder be used on?

  • suction line
  • liquid line
  • discharge line
  • none of the above

5: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 720,000
  • 200
  • 12,000

6: What is the leaving chilled water set point for water chiller systems?

  • 38F
  • 45F
  • 55F
  • 66F

7: Ammonia is under what safety classification?

  • B1
  • B3
  • A3
  • B2

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

  • scroll
  • centrifugal
  • reciprocating
  • screw

9: What is an egress?

  • A code violation
  • An entrance or exit
  • A valve put on the low side of the system to prevent frosting
  • An escape route

10: A mercury bulb controller is not recommended for

  • line voltage use
  • use where vibration is severe
  • line or low voltage use
  • low voltage use

11: How many opening forces operate a thermostatic expansion valve?

  • 4
  • 2
  • 3
  • 1

12: When air is ducted through a machine room that services occupied space, What must be done?

  • Welded and seamed.
  • Insulated and cross broke
  • Ducted and sealed
  • Flanged and gasketed

13: On a centrifugal compressor, stationary diffuser vanes are needed to

  • stop gas flow
  • convert velocity energy to pressure
  • increase the clearance space
  • prevent high pressure on the packing

14: Which creates more of a heat load?

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

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

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

16: What device measures the specific gravity of a substance?

  • Manometer
  • Thermometer
  • Hydrometer
  • Hygrometer

17: A start capacitor is wired in _____ with the start windings.

  • parallel
  • junction
  • series-parallel
  • series

18: What refrigerant were phased out in 2004?

  • R-12
  • R-134a
  • R-22
  • R-11

19: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

20: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?

  • 15 uf
  • 25 uf
  • 40 uf
  • 20 uf

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

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

22: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

23: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

24: Booster compressors, pump refrigerant into the

  • receiver
  • low side of the primary compressor
  • high side of the secondary compressor
  • heat & plate heat exchanges

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

  • PVC
  • Stainless steel
  • Copper
  • Magnesium alloy