Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

2: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 75%
  • 80%
  • 90%
  • 100%

3: High pressure controls should be set no higher than

  • 80% of set point
  • 90% of set point
  • 25% of set point
  • 10% of set point

4: A positive displacement compressor is

  • is a reciprocating type compressor with 2 or more pistons
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber

5: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

6: What is an egress?

  • An escape route
  • A code violation
  • A valve put on the low side of the system to prevent frosting
  • An entrance or exit

7: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Classifed
  • Insulated and installed in a pipe duct (Encased)
  • Leak checked
  • Certified

8: What would be the classification of a church?

  • Large mercantile
  • Place of assembly
  • Institutional
  • Industrial

9: Horizontal piping should be run level.

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

10: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

11: The density of a gas refers to

  • cubic feet per pound
  • pounds per square foot
  • pounds per cubic foot
  • pounds per absolute pressure

12: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • low pressure
  • critical pressure
  • high pressure
  • design pressure

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

  • Magnesium
  • Nickel
  • Zinc
  • Copper

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

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

15: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above

16: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • compressor
  • boiler
  • outside the machinery room
  • evaporator

17: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 75
  • 100
  • 24
  • 50

18: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UV or UR
  • UM or UL
  • UL and UR
  • UL and UM

19: What is the purpose of suction/discharge traps?

  • to ensure proper oil return to the compressor
  • to keep oil inside the evaporator for proper oil return to the compressor
  • to keep oil inside of the accumulator for proper return to the compressor
  • all of the above

20: Megaohm meter's main function is

  • to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
  • to detect very high resistances to ground of refrigeration or air conditioning compressors
  • to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
  • Both a and b are correct

21: A start capacitor is wired in _____ with the start windings.

  • series-parallel
  • junction
  • parallel
  • series

22: R-12 is

  • dichlorofluoromethane
  • trichlorofluoromethane
  • dichloromethane
  • dichlorodifluoromethane

23: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the

  • opening at the pump outlet
  • opening at the pump inlet
  • cooling temperature set-point
  • adjustment of the spring tension of the TXV

24: Where are the three places that the discharge from an ammonia relief valve be piped?

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

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

  • oil side
  • low side
  • vapor
  • liquid