Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Megaohm meters can detect a ground in the

  • up to 1,000,000 ohms
  • up to 1,000 ohms
  • 10,000,000 ohms or higher
  • up to 10,000 ohms

2: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

3: What must be done to refrigerant pipes before being buried?

  • Coated
  • Leaked checked
  • Encased
  • Certified

4: When air is ducted through a machine room that services occupied space, What must be done?

  • Flanged and gasketed
  • Insulated and cross broke
  • Welded and seamed.
  • Ducted and sealed

5: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

6: The generator shell contains the

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

7: Ammonia vaporization takes place at what temperature?

  • -110F
  • -32F
  • -460F
  • -28F

8: 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

9: Give an example of a secondary coolant?

  • R-410A
  • R-717
  • R-12
  • R-718

10: When must refrigeration system covered by the code be inspected?

  • Annually
  • Annually and when installed
  • Not required
  • Upon installation

11: Who authorizes changes to the safety codes?

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

12: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 80
  • 90
  • 100
  • 110

13: All low-pressure chillers use which type of compressor?

  • Centrifugal
  • Reciprocating
  • Scroll
  • Rotary

14: Which oil is hydoscopic?

  • animal
  • mineral
  • SW30
  • polyolester

15: Class A refrigerants are considered

  • flammable
  • non-toxic
  • toxic
  • non-flammable

16: Fusible plugs shall not be used with pressure vessels of

  • 15 square feet or less
  • 3 cubic feet or less
  • 15 cubic feet or more
  • 3 cubic feet or more

17: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • HCFC-123
  • Lithium bromide
  • ammonia
  • CFC-11

18: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • motor starter
  • printed circuit board (PCB)
  • centrifugal switch
  • duel-voltage switch

19: R-22 is considered a(n)

  • HCFC
  • CFC
  • HFC
  • HCFCH

20: Suction line oil traps should be installed when the condenser is

  • in the basement and the evaporator is on the third floor
  • on the third floor roof and the evaporator is in the basement
  • located outside the operates in temperatures below 35F
  • more than 100' away from the evaporator

21: Electricity involves the movement of electrons in atoms

  • True
  • False

22: A relief valve shall be located at least ___ above grade.

  • 15'
  • 10'
  • 25'
  • 36'

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: R-717 is

  • water
  • trichloromethane
  • carbon dioxide
  • ammonia

25: Name three things that must be done when changing refrigeration lubricant?

  • Nothing must be done
  • Make sure it's compatible, notify owner, notify AHJ
  • You can't change lubricants.
  • Place sign, check for leaks, insulate