Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: One atmosphere equals

  • 0 psig
  • 14.7
  • 0 psia
  • 29.4

2: Where is an EPR valve located on a multi-evaporator system?

  • Suction line of the warmest evaporator
  • Suction line of the coolest evaporator
  • Suction line at the compressor
  • Suction line prior to the accumulator of the lowest temperature system

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

  • 1%
  • 4%
  • 2%
  • 25%

4: What does an anemometer measure?

  • velocity
  • amperage
  • temperature
  • voltage

5: The most common type of motor starter is

  • delts-wye starter
  • duel-winding starter
  • across the line starter
  • part winding starter

6: 1 HP = ____ Watts?

  • 3,412
  • 746
  • 11,239
  • 3.1416

7: A restaurant is classified as a

  • public assembly occupancy
  • commercial occupancy
  • large mercantile occupancy
  • mixed occupancy

8: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

9: 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

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

  • 75%
  • 100%
  • 80%
  • 90%

11: Copper and its alloys shall not be used with ammonia

  • True
  • False

12: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • “UM” and “UV”
  • “UV”
  • “U” or “UM”
  • “UL”

13: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 15
  • 75
  • 55
  • 50

14: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

15: The generator shell contains the

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

16: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

17: Gauge pressure is

  • Barometric pressure
  • Force of pressure above that of atmosphere
  • Atmospheric pressure
  • Absolute pressrue

18: The critical temperature of a refrigerant gas occurs when

  • any increase in pressure will not liquefy the gas
  • the gas is no longer saturated
  • the gas returns to a liquid
  • any decrease in pressure will cause condensation

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

  • 480
  • 277
  • 1/3 the voltage

20: 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

21: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, paper method, and frost line.

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

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

23: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

24: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • the owner shall be informed
  • gas masks must be worn
  • no flames shall be permitted
  • explosion precautions must be taken

25: 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

  • evaporator
  • outside the machinery room
  • compressor
  • boiler