Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • 60
  • 12,000
  • 720,000
  • 200

2: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Nickel
  • Zinc
  • Magnesium
  • Copper

3: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

4: R-123 belongs to Group

  • B-2
  • B-3
  • B-1
  • A-3

5: 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

6: Pressure relief valves shall be marked with the data from

  • Section VIII Division of the ASME Boiler & Pressure Code
  • Section I Division VIII of ASME Boiler & Pressure Code
  • Section IV Division of the ASME Boiler & Pressure Code
  • Section XIII Division of the ASME Boiler & Pressure Code

7: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • duel-voltage switch
  • motor starter
  • printed circuit board (PCB)
  • centrifugal switch

8: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 25%
  • 4%
  • 2%
  • 1%

9: 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

10: Doors communicating with outside from a mechanical room must be?

  • Self-closing, aligned, fire door
  • Steel, approved, weather-stripped
  • Self-closing, approved, fire door
  • Self-closing, wooden, fire door

11: A micron is

  • one thousandths of a millimeter
  • one millonths of a micrometer
  • a larger unit of measurement than Hg
  • one millonths of a centimeter

12: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When there are sprinklers above
  • When it's used as part of a supply or return air system
  • When its white
  • When there is a space 6' or more above it

13: Pi equals approximately

  • 3.41
  • 12,000
  • 746
  • 3.14

14: The oil separator is always inserted in the system

  • to prevent oil logging
  • in the discharge line
  • in a cool spot
  • where it can be easily serviced

15: Direct systems using Group II refrigerants

  • shall be allowed to be used for human comfort.
  • shall be installed per instruction of the AHJ
  • shall be installed in Class T machinery rooms
  • shall not be used for air condition for human comfort

16: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • 1250
  • There isn't enough information to answer.
  • 2
  • 2.5

17: Watt's Law indicates Volts X Amps = _________.

  • Ohms
  • Current
  • Watts
  • Resistance

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

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

19: Institutional occupancy is

  • a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • None of the above

20: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • latent heat
  • lost heat
  • specific heat
  • sensible heat

21: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

22: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

23: 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
  • 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

24: What section governs pressure vessels?

  • Section 8 ASHREA 15 ASME unfired
  • Section 1 ASHREA 15 ASME fired
  • Section ASHREA 34
  • OSHA

25: Which refrigerant(s) is an HFC?

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