Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: How many gallons of water per pound of ammonia do you need?

  • 15
  • 20
  • 1
  • 5

2: The principle used in continuous type absorption systems is

  • Boyle's Law
  • Ohm's Law
  • Charles's Law
  • Dalton's Law

3: An air conditioning system rated for 36,000 BTU's is equivalent to

  • one ton of cooling
  • 12,000 tons of cooling
  • two tons of cooling
  • three tons of cooling

4: Ammonia is under what safety classification?

  • A3
  • B1
  • B2
  • B3

5: The critical temperature of a refrigerant gas occurs when

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

6: The discharge relief valve is located (9.4.6)

  • on top of the condensor
  • between the compressor and oil separator
  • between the compressor and reciever
  • between the compressor and the stop valve

7: Where can 50/50 solder be used on?

  • suction line
  • liquid line
  • discharge line
  • none of the above

8: Class 3 refrigerants are

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

9: Dew point is

  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to evaporate
  • the temperature below which water vapor in the air will start to condense
  • the temperature of air of 50% RH

10: 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.

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

11: Excessive head pressure is often caused by

  • thermostat set too high
  • air cooled condenser is plugged
  • insufficient refrigerant
  • leaking reed valve on the discharge side

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

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

13: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • low voltage t-stat
  • aquastat
  • immersion controller
  • line voltage t-stat

14: What refrigerant doesn't have to be classified?

  • R-134A
  • R-422A
  • R-717
  • R-718

15: Usually dry bulb temperature is

  • lower than dry bulb temperature
  • not important and shall be ignored
  • higher than wet bulb temperature
  • same as wet bulb temperature

16: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • 20 amps
  • There isn't enough information to answer.
  • 10 amps
  • 24 amps

17: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.

  • 9.00'
  • 8'4"
  • 7.00'
  • 7.25'

18: Which is considered the more efficient condenser?

  • spray cooled
  • air cooled
  • water cooled
  • fan cooled

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

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

20: Direct systems using Group II refrigerants

  • shall be installed per instruction of the AHJ
  • shall be installed in Class T machinery rooms
  • shall not be used for air condition for human comfort
  • shall be allowed to be used for human comfort.

21: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 800F
  • 700F
  • 1000F
  • 600F

22: A thermometer inside a duct measures ____ heat.

  • specific
  • sensible
  • latent
  • hidden

23: Halogenated refrigerants cannot be used with what material?

  • Stainless steel
  • Magnesium alloy
  • Aluminum
  • Copper

24: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

25: Horizontal piping should be run level.

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