Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The freezing point of water at sea level is?

  • 32C
  • 0F
  • 32F
  • -10C

2: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 21F
  • 11F
  • 29F
  • 9F

3: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

4: 1 Watt = ______ BTU's?

  • 4.482
  • 7.216
  • 12
  • 3.412

5: On a TXV, the purpose of an external equalizer is to?

  • balance the evaporator load
  • compensate for a pressure drop across the evaporator coil
  • allow a greater adjustment spam
  • Increase the pressure on the top of the power head diaphragm

6: R-22 is classified as a ____ refrigerant on the safety matrix.

  • B-2
  • B-1
  • A-2
  • A-1

7: The gauge thickness required on a CO2 tank construction is

  • 1/16"
  • 5/16"
  • 3/32"
  • 1/8"

8: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 80 ohms
  • 71 ohms
  • 104 ohms
  • 27 ohms

9: Class 3 refrigerants are

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

10: What is not a requirement of a class T machine room?

  • self-closing doors
  • automatic ventilation
  • fire hose connection to the building fire protection system
  • tight fitting doors

11: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices
  • shall use rupture discs or duel pressure relief valves
  • shall use fusible plugs

12: Sensible heat is the heat added to a substance to

  • cause evaporation
  • freeze it
  • raise its temperature
  • change its state

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

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

14: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

15: If the suction pressure is low and the evaporator temperature high, the cause will be a?

  • overcharged
  • compressor suction valve stuck open
  • starved evaporator
  • too small evaporator

16: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 22
  • 18
  • 33
  • 50

17: R-11 belongs to Group

  • A-2
  • B-1
  • B-3
  • A-1

18: 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

19: Class T machine room

  • has no flame producing apparatus permanently installed
  • shall have refrigerant leak detecting systems installed inside and outside the room
  • shall have remote controls to stop the action of the refrigerant compressor
  • shall include closets used for setting equipment

20: While the system is operating, the discharge line should be

  • 10-15F warmer than ambient
  • room temperature
  • too hot to hold by hand
  • at the same temperature as the crankcase

21: What type of oil is used in R-410A systems?

  • mineral oil
  • polyalkylene glycol (PAG)
  • naphthene
  • polyolester (POE)

22: 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

23: Liquid level gauges must be provided with what?

  • Automatic shut-offs
  • A relief valve
  • A red line
  • A low level mark

24: Atmospheric pressure is equal to

  • 29.92" Hg
  • 14.7 psia
  • 14.7 psig
  • both a & b

25: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 1000 watts
  • 600 watts
  • 746 watts
  • 5KW