Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 3/8"
  • 3/4"
  • 1/2"
  • 5/8"

2: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 257 psig, 77 psig
  • 455 psig, 185 psig
  • 226 psig, 68 psig
  • 350 psig, 120 psig

3: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to

  • hold up to 110% of the pumpdown charge
  • Pumpdown procedures are not allowed with systems containing liquid recievers
  • receive the pumpdown charge
  • release the charge when the pressure exceeds 310 psig or higher

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

5: The location of a thermal bulb of a TXV affects

  • subcooling
  • the amount of liquid refrigerant in the evaporator
  • the amount of liquid in the condenser.
  • the amount of liquid returning to the compressor

6: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

7: What is an egress?

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

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

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

9: Capacity control on an absorption system is typically accomplished by varying the

  • speed of the condenser water circulator pump
  • rate at which heat is supplied to the generator
  • speed of the chilled water circulatory pump
  • pressure setting on the system's rupture disc

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

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

11: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is

  • Specific heat
  • Sensible heat
  • Latent heat
  • Enthalpy

12: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of the liquid line
  • outlet of high temperature evaporator
  • inlet of the low temperature evaporator.
  • outlet of low temperature evaporator

13: The absorber shell contains the

  • evaporator and the absorber
  • condenser, the evaporator, and the generator
  • condenser and the generator
  • condenser and the absorber

14: Give an example of a secondary coolant?

  • R-410A
  • R-12
  • R-717
  • R-718

15: The purpose of an accumulator is to

  • store excess refrigerant from the reciver
  • reduce friction loss to the flow of refrigerant
  • filter out impurities from the system
  • assure no liquid returns to the compressor

16: Floc point is

  • the lowest temperature at which dissolved waxes and solids begin to separate in a system
  • the highest temperature at which dissolved waxes and solids begin to separate in a system
  • the lowest temperature at which dissolved waxes and solids begin to solidify in a system
  • the highest temperature at which dissolved waxes and solids begin to solidify in a system

17: R-123 belongs to Group

  • A-3
  • B-3
  • B-2
  • B-1

18: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

19: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

20: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

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

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

22: How many volts would you read on a 480V system phase to phase?

  • 1/3 the voltage
  • 480
  • 277

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

  • PVC
  • Magnesium alloy
  • Stainless steel
  • Copper

24: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

25: How many different groups of refrigerants are there?

  • 7
  • 11
  • 3
  • 15