Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which of the following is an inorganic refrigerant?

  • R-22
  • Ammonia
  • Chlorofluorocarbons
  • All of the above

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

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

3: R-717 is

  • carbon dioxide
  • trichloromethane
  • water
  • ammonia

4: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • ammonia
  • HCFC-123
  • Lithium bromide
  • CFC-11

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

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

6: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1.2
  • 2.2
  • 1
  • 1.5

7: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

8: Class T machine room

  • shall include closets used for setting equipment
  • has no flame producing apparatus permanently installed
  • shall have remote controls to stop the action of the refrigerant compressor
  • shall have refrigerant leak detecting systems installed inside and outside the room

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

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

10: Megaohm meters can detect a ground in the

  • 10,000,000 ohms or higher
  • up to 1,000 ohms
  • up to 1,000,000 ohms
  • up to 10,000 ohms

11: Horizontal piping should be run level.

  • No, unless the supervisor on the job says so.
  • False
  • Yes, if the condenser is located above the evaporator
  • True

12: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 3.0, 3.5
  • 2.5, 3.0
  • 2.5, 2.5
  • 6.6, 6.6

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

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

14: How many BTU's is produced by one watt of energy

  • 1
  • 3.41
  • 3.00
  • 2.57

15: If the suction pressure is low and the evaporator temperature high, the cause will be a?

  • overcharged
  • starved evaporator
  • compressor suction valve stuck open
  • too small evaporator

16: What is the minimum height refrigeration piping should be placed against walls?

  • 6'
  • 7.25'
  • Ceiling height
  • 72"

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

  • Hydrometer
  • Manometer
  • Hygrometer
  • Thermometer

18: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b

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

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

20: 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

21: R-123 belongs to Group

  • A-3
  • B-3
  • B-2
  • B-1

22: How many flammability classifications are refrigerants in?

  • 5
  • 7
  • 3
  • 2

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

  • orange
  • green
  • blue
  • red

24: 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

25: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • 10 amps
  • There isn't enough information to answer.
  • 20 amps
  • 24 amps