Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

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

  • 75%
  • 100%
  • 90%
  • 80%

4: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 18
  • 15
  • 10
  • 24

5: When a refrigeration or air conditioning system is installed

  • it shall not be operated below prescribed pressures
  • the form of certificate shall be authorized by the Department of Pubic safety
  • a field inspection shall be made before it is put into service
  • it shall be approved by the owner for proper operation.

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

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

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

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

8: The measurement of heat in a particular substance is

  • latent heat
  • specific heat
  • enthalpy
  • sensible heat

9: What would be the classification of a prison?

  • Industrial
  • Institutional
  • Place of assembly
  • Large mercantile

10: A High-Probablity system

  • is such that a leak of refrigerant from failed connections will enter the occupied space
  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak from a failed connection or component of such system

11: Gauge pressure is

  • atmospheric pressure
  • force of pressure above that of atmospheric
  • absolute pressure
  • what a gauge reads when checking pressures on a chilled water system.

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

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

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

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

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

  • CPR valve
  • EPR valve
  • EEV
  • Solenoid valve

15: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 9F
  • 29F
  • 11F
  • 21F

16: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 120v
  • 240v
  • 277v
  • 208v

17: When should a relief valve start to function?

  • 10 psi before it's set pressure
  • Two times it's working pressure
  • Before the purge station discharges
  • At it's set pressure

18: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

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

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

20: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

21: The proper location for an oil separator is between the

  • compressor and condenser
  • condenser and receiver
  • receiver and metering device
  • evaporator and compressor

22: The leaving chilled water set point for comfort cooling is typically?

  • 38
  • 66
  • 60
  • 45

23: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

24: "E" references ____ in the Ohm's law formula

  • resistance
  • voltage
  • amperage
  • capacitance

25: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices
  • shall use fusible plugs
  • shall use pressure relief devices or fusible plugs
  • shall use rupture discs or duel pressure relief valves