Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

2: Joints in refrigeration piping must be _____ before being covered?

  • Leak tested
  • Insulated
  • Inspected
  • Pressurized

3: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 455 psig, 185 psig
  • 257 psig, 77 psig
  • 226 psig, 68 psig
  • 350 psig, 120 psig

4: NH3 is

  • ammonia
  • R-508A
  • lithium bromide
  • R-718

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

  • True
  • False

6: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • accumulate in the sump water
  • blown to the atmosphere by the fan
  • remain in the air
  • washed out of the air by the spray pump

7: Which refrigerant is lighter than air?

  • R-717
  • R-123
  • R-11
  • R-134a

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

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

9: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • lift voltage
  • pick up voltage
  • run voltage
  • boost voltage

10: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

11: What would be the classification of a church?

  • Institutional
  • Industrial
  • Place of assembly
  • Large mercantile

12: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 50
  • 100
  • 24
  • 75

13: Halo-carbon refrigerants cannot be used with what material?

  • Stainless Steel
  • Aluminum
  • Copper
  • Magnesium alloy

14: A class A3 refrigerant is considered

  • toxic and somewhat flammable
  • non-toxic but highly flammable
  • toxic and non-flammable
  • non-toxic and non-flammable

15: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

16: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 75%
  • 99%
  • 90%
  • 80%

17: B3 refrigerants are considered

  • non-toxic but flammable
  • non-toxic but non-flammable
  • toxic and highly flammable
  • toxic but non-flammable

18: What type of copper is not permitted on refrigeration systems?

  • Type M
  • Type L
  • Type N
  • Type K

19: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

20: What is the amp draw of a 40 VA transformer at 24 volts

  • 1,000 amps
  • 106 amps
  • 1K amps
  • 1.6 amps

21: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

22: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 3/8"
  • 5/8"
  • 3/4"
  • 1/2"

23: The location of a thermal bulb of a TXV affects

  • the amount of liquid returning to the compressor
  • the amount of liquid in the condenser.
  • subcooling
  • the amount of liquid refrigerant in the evaporator

24: Single compound Refrigerants are classified by what two criteria?

  • Temperature range and hazardousness
  • Flammability and toxicity
  • Weight and color
  • Flammability and temperature range

25: A mercury bulb controller is not recommended for

  • low voltage use
  • line voltage use
  • line or low voltage use
  • use where vibration is severe