Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is considered a cooling agent?

  • any liquid used for the transmission of heat without vaporization
  • any liquid used for the transmission of heat without condensation
  • any liquid used for the transmission of heat when condensation occur
  • any liquid used for the transmission of heat when vaporization occurs

2: Before replacing a seized compressor, the _______ should be determinded.

  • current draw
  • designed head pressure
  • cause of seizure
  • type of refrigerant

3: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

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

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

5: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

6: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 71 ohms
  • 80 ohms
  • 27 ohms
  • 104 ohms

7: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low pressure chillers do not have purge units
  • low suction pressure
  • high head pressure
  • increased capacity

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

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

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

  • Latent heat
  • Specific heat
  • Enthalpy
  • Sensible heat

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

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

11: Trichlorofluoromethane is the name of what refrigerant?

  • R-113
  • R-502
  • R-12
  • R-11

12: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above

13: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

14: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class A machinery room
  • Class B machinery room
  • Class M machinery room
  • Class T machinery room

15: When an inspection is needed, how often must it be done?

  • every 36 months
  • every 24 months
  • annually
  • every 18 months

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

  • scroll
  • reciprocating
  • screw
  • centrifugal

17: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • public assembly occupancy
  • institutional occupancy
  • commercial occupancy
  • mixed occupancy

18: Which refrigerant replaced R-12?

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

19: What type of relief valve is used on a CO2 system?

  • glove disc
  • fusible plug
  • rupture disc
  • gate valve

20: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • decreases
  • run as designed with low ambient controls
  • doesn't change
  • increases

21: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 255 psig
  • 327 psig
  • 125 psig
  • 365 psig

22: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

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

  • 660 lbs
  • 330 lbs.
  • 55 lbs
  • 550 lbs

24: What device should be used on low-temperature freezers?

  • high capacity TXV
  • discharge muffler
  • hot-gas by-pass
  • oil separator

25: What type of oil is used in R-410A systems?

  • polyalkylene glycol (PAG)
  • mineral oil
  • polyolester (POE)
  • naphthene