Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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.

2: Dual-pressure relief devices should be installed on

  • vessels of 3 cubic feet or more
  • vessels of 3 cubic feet or less
  • vessels of 10 cubic feet or less
  • vessels of 10 cubic feet or more

3: Ammonia systems use ____ pressure to adjust oil pressure

  • air
  • discharge
  • liquid
  • stream

4: Indirect systems using Group II refrigerants

  • shall have all refrigerant containing parts except piping, installed in a Class T machine room
  • shall be used in refrigeration system less than 1,000 lbs
  • shall be used for mechanical equipment only
  • shall be used in refrigeration system in excess of 1,000 lbs

5: Capacitors are rated in

  • megaohms
  • volt - amperes
  • micro-farads
  • kelvins

6: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Insulated and installed in a pipe duct (Encased)
  • Leak checked
  • Classifed
  • Certified

7: Which refrigerant is lighter than air?

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

8: 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.

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

9: What refrigerant were phased out in 2004?

  • R-12
  • R-134a
  • R-22
  • R-11

10: Color is important in oil because

  • it makes sight glasses easy to read
  • can tell us something about the refining of oil
  • allows you to see into crankcase
  • it indicates the viscoisty.

11: How many BTU's is produced by one watt of energy

  • 2.57
  • 3.00
  • 1
  • 3.41

12: The boiling point of a refrigerant is based on

  • Temperature
  • Heat content
  • a pressure-temperature relationship
  • None of the above.

13: What does safe access mean?

  • Locked doors
  • OSHA approved
  • Well-lit exit signs
  • A clear unobstructed path to the equipment and controls

14: What are the three components of a transformer?

  • Primary coil, secondary coil, and core
  • Primary core, secondary coil, and high and low voltage connectors.
  • Primary coil, secondary coil, and copper contacts
  • Contacts, secondary coil, and core

15: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 60% Li-Br, 40% distilled water
  • 40% Li-Br, 60% distilled water
  • 40% Li-Br, 60% tap water
  • 50% Li-Br, 50% tap water

16: Which refrigerant class listed below is the most flammable?

  • C-3
  • A-3
  • B-2
  • A-1

17: Increasing superheat will do what to your system?

  • Decrease liquid flow
  • Increase liquid flow
  • Increase gas flow
  • Nothing

18: A High-Probablity system

  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from failed connections will enter the occupied space
  • is a system highly likely to leak from a failed connection or component of such system
  • is such that a leak of refrigerant from failed connections will enter the unoccupied space

19: Halogenated refrigerants cannot be used with what material?

  • Stainless steel
  • Copper
  • Aluminum
  • Magnesium alloy

20: "R" represents ___ in the Ohm's law formula

  • amperage
  • resistance
  • voltage
  • capacitance

21: The proper location for an oil separator is between the

  • receiver and metering device
  • compressor and condenser
  • condenser and receiver
  • evaporator and compressor

22: 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

23: On a single phase motor, when does the start winding cut out?

  • 100% of its RLA speed
  • 25% of its RLA speed
  • 75% of its RLA speed
  • 50% of its RLA speed

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

  • Pressurized
  • Inspected
  • Insulated
  • Leak tested

25: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above