Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A halide torch is most useful with a freon compression system

  • to remove from from TXV's and evaporator coils
  • to detect refrigeration leaks in piping joints
  • to sweat flanges on the refrigeration piping
  • to release a sticking valve

2: Who is permitted to access a refrigeration machine room?

  • Anyone, it's a completely safe area
  • Contractors only
  • Any employee
  • Authorized persons only

3: On a single phase motor, when does the start winding cut out?

  • At 50% of its full rated speed
  • At 75% of its full rated speed
  • Start windings do no cut-out of the run cycle
  • At 25% of its full rated speed

4: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

5: What refrigerant doesn't have to be classifted?

  • R-134a
  • R-717
  • R-711
  • R-718

6: The formula for Pure Power in a resistance circuit is

  • Watts X power factor
  • Kw = volts X amps
  • Watts X amps.
  • Watts = volts X amps

7: By using nitrogen within a pipe during brazing operation,

  • The explosion hazard is confined
  • Copper oxide formation is prevented
  • Discoloration is prevented
  • Exterior scale formation is minimized

8: Horizontal piping should be run level.

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

9: All serviceable components of a refrigeration system shall be provided with

  • manufactures instructions on start-up procedures
  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
  • safe access
  • service manuals

10: Ammonia vaporization takes place at what temperature?

  • -32F
  • -460F
  • -28F
  • -110F

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

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

12: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within

  • 30 days
  • 14 days
  • 1 week
  • 2 months

13: 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

14: What is NOT a positive displacement compressor.

  • Rotary
  • Scroll
  • Reciprocating
  • Centrifugal

15: 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

16: The low pressure oil safety switch

  • resets itself after the time delay has terminated
  • resets itself automatically
  • must be reset manually
  • never trips

17: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.

  • 9.00'
  • 8'4"
  • 7.25'
  • 7.00'

18: Liquid line filter-driers on a 410A system must be rated for no less than

  • 1000 psig
  • 600 psig
  • 200 psig
  • 400 psig

19: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

20: A low oil switch is typically

  • automatic reset
  • time-delay auto reset
  • non used on semi-hermetic compressors over 10 ton capacity
  • manual reset

21: NH3 is

  • ammonia
  • lithium bromide
  • R-718
  • R-508A

22: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

23: Crankcase heaters are energized

  • while the compressor is running
  • to prevent compressor freeze-up
  • to allow easy compressor start-up
  • when the compressor is off

24: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above

25: Who authorizes changes to the safety codes?

  • Contractor who last serviced the system.
  • Person who pulled the permit
  • Board of Boilers
  • Person in charge of the facility