Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

2: When the compressor is below the condensor

  • traps are needed on the oil return line
  • traps are needed on the suction line
  • traps are needed on the discharge line
  • traps are not needed on this type of system

3: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • diluted solution
  • strong solution
  • absorbed solution
  • weak solution

4: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b

5: An electronic bridge circuit is basically a

  • suspension
  • Wheatstone
  • high voltage circuit
  • 24 volt control circuit

6: A hotel is considered a _______ occupancy.

  • commercial
  • mercantile
  • residential
  • institutional

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

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

8: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

9: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 13.9 lbs
  • 22 lbs
  • 44 lbs
  • 6.6 lbs

10: What type refrigerant is NOT ozone depleting?

  • HFC
  • CFC
  • HCFC
  • Halon

11: Refrigerant restricted in 2004 but used for transition for decades:

  • R-134A
  • R-22
  • R-123
  • R-11

12: Lithium-bromide, Li-Br, is best characterized as a

  • salt
  • sugar
  • sand
  • soil

13: Increasing superheat will do what to your system?

  • Increase liquid flow
  • Decrease liquid flow
  • Nothing
  • Increase gas flow

14: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

15: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

16: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 36
  • 48
  • 18
  • 24

17: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

18: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • Low pressure
  • R-414B
  • Simple
  • Cascade

19: Increasing superheat will do what to your frost line?

  • Increasae
  • Nothing
  • Decrease
  • Could either increase or decrease depending on the load conditions

20: 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.

21: Pressure is the equivalent of

  • force per unit area
  • force times area
  • force
  • area times force

22: Which oil is hydoscopic?

  • SW30
  • polyolester
  • animal
  • mineral

23: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the low side
  • the aggregate of the high side and low side
  • the high side
  • 2.5 times the design pressure

24: 1 Watt = ______ BTU's?

  • 7.216
  • 3.412
  • 12
  • 4.482

25: Which refrigerant class listed below is the most flammable?

  • A2
  • C3
  • A3
  • B2