Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A low oil switch is typically

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

2: Which refrigerant is lighter than air?

  • R-11
  • R-134a
  • R-717
  • R-123

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

  • 10
  • 24
  • 18
  • 15

4: Cooling tower lowers condenser water temp by

  • running fans at 100%
  • evaporative cooling
  • running water thru a secondary heat exchanger
  • condensation

5: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above

6: The discharge relief valve is located (9.4.6)

  • between the compressor and reciever
  • between the compressor and the stop valve
  • between the compressor and oil separator
  • on top of the condensor

7: Dew point is

  • the temperature of air of 50% RH
  • the temperature below which water vapor in the air will start to condense
  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to evaporate

8: Pressure vessels with an internal volume of 3 cubic feet or more

  • shall use pressure relief devices
  • shall use fusible plugs
  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection

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

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

10: The high side float assembly meters refrigerant into the evaporator through the

  • upper chamber of the high side
  • lower chamber of the low side
  • upper chamber of the low side
  • lower chamber of the high side

11: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • relief plug
  • rupture plug
  • fusible plug
  • fusion plug

12: What kind of material can't be used on the outlet of a relief valve?

  • PVC
  • Aluminum
  • Stainless Steel
  • Copper

13: If your suction line is warmer than the room temperature, this may indicate

  • below normal superheat
  • a low charge
  • plugged air filter
  • an over charge

14: Booster compressors connect to the ____ side of the compressor

  • low side
  • vapor
  • liquid
  • oil side

15: Secondary refrigerants are usually

  • alcohol
  • Prestone anti-freeze
  • expensive
  • water or brine

16: 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

17: If the spring is adjusted to increase the superheat, this new setting will

  • have no effect on the frost line
  • allow more liquid into the evaporator
  • shorten the frost line
  • lengthen the frost line

18: A capacitor in series with the start windings will do what?

  • Increase run efficiency by 10% of its rating
  • Nothing
  • Increase starting torque
  • Decrease the RLA to within 10% of its rating

19: What is the maximum voltage range allowed on an electrical circuit?

  • 5%
  • 10%
  • 20%
  • 15%

20: 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

21: The generator shell contains the

  • condenser and the absorber
  • condenser and the generator
  • evaporator and the absorber
  • condenser, the evaporator, and the generator

22: How many volts would you read on a 480V system phase to phase?

  • 480
  • 1/3 the voltage
  • 277

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

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

24: How are safety controls wired in a circuit?

  • Series/parallel
  • Either series or parallel
  • Series
  • Parallel

25: A micron is

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