Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • blue
  • green
  • orange
  • red

2: The heat picked up in the evaporator must equal to

  • the heat giving by the condenser
  • the heat of compression
  • the heat lost by the medium being cooled
  • the heat gained by the condenser

3: Halogenated refrigerants cannot be used with what material?

  • Aluminum
  • Stainless steel
  • Magnesium alloy
  • Copper

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

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

5: If air is present in an absorption chilled water appliance, which of the following will most likely occur?

  • The Li-Br solution will become more concentrated
  • Rust can form
  • System operating pressure will drop
  • The Li-Br solution will become more diluted

6: How much refrigerant can be stored in a mechanical room outside of the system?

  • 200
  • 100
  • 150
  • 330

7: Two systems using separate refrigerants that are superimposed upon one another is called

  • indirect
  • booster
  • cascade
  • single stage

8: Which is considered the more efficient condenser?

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

9: How many CFMs are required per square foot of commercial office occupied space

  • 5 CFM
  • 20 CFM
  • 15 CFM
  • .5 CFM

10: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 58F
  • 70F
  • 77F
  • 32F

11: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

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

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

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

  • 800F
  • 1000F
  • 600F
  • 700F

14: How would you know if there was a loss of crankcase pressure?

  • oil will thicken
  • oil level will rise
  • oil will foam
  • oil will thin out

15: What is the minimum height refrigeration piping should be placed against walls?

  • 7.25'
  • Ceiling height
  • 72"
  • 6'

16: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 108
  • 88
  • 38
  • 116

17: If your suction line is warmer than the room temperature, this may indicate

  • plugged air filter
  • a low charge
  • below normal superheat
  • an over charge

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

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

19: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 4
  • 5
  • 3
  • 2

20: R-11 belongs to Group

  • B-3
  • A-1
  • B-1
  • A-2

21: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

22: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • boiler
  • outside the machinery room
  • compressor
  • evaporator

23: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, pressure, and frost line
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick
  • sight glass, weight, paper method, and frost line.

24: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

25: What must be done if refrigeration lines pass through a concrete floor?

  • installed through a pipe casing
  • leak checked
  • moisture barrier
  • insulated