Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A capacitor in series with the start windings will do what?

  • Decrease the RLA to within 10% of its rating
  • Nothing
  • Increase starting torque
  • Increase run efficiency by 10% of its rating

2: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

3: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

4: The evaporator is a device to

  • Keep the compressor busy
  • absorb heat into the refrigeration system
  • store liquid refrigerant
  • remove heat from the refrigeration system

5: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.

  • True
  • False

6: A pressure relief should be located at least _______ from windows and doors.

  • 25'
  • 15'
  • 20'
  • 30'

7: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • institutional occupancy
  • public assembly occupancy
  • commercial occupancy
  • mixed occupancy

8: Heat transferred by conduction from one body to another is done

  • via liquids
  • via solids
  • via heat rays
  • via radiation

9: How many refrigerant classifications are there for toxicity?

  • 2
  • 1
  • 3
  • 5

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

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

11: Class A refrigerants are considered

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

12: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 90%
  • 80%
  • 100%
  • 75%

13: _____ and its alloys are suitable for use with ammonia systems.

  • Copper
  • Magnesium
  • Aluminum
  • Zinc

14: What is Absolute Zero?

  • -460F
  • -400F
  • -640F
  • -773F

15: A restaurant is classified as a

  • large mercantile occupancy
  • commercial occupancy
  • public assembly occupancy
  • mixed occupancy

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

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

17: Which refrigerant is lighter than air?

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

18: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

19: Where is the high-side float located on a chiller system?

  • inside the chiller barrel
  • flash line
  • discharge line
  • liquid line

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

  • A-2
  • A-1
  • B-1
  • B-2

21: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • over pressure protection as well as a temperature protection device
  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection
  • over pressure protection and a rupture disc

22: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • True
  • depends on the type of refrigerant being used
  • False
  • are obsolete.

23: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • merge
  • purge
  • surge
  • splurge

24: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

25: 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