Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • 80%
  • 90%
  • 100%
  • 75%

2: The formula for Pure Power in a resistance circuit is

  • Kw = volts X amps
  • Watts = volts X amps
  • Watts X amps.
  • Watts X power factor

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

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

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

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

5: Which refrigerant replaced R-12?

  • R-134A
  • R-410A
  • R-407A
  • R-22

6: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class A machinery room
  • Class B machinery room
  • Class M machinery room
  • Class T machinery room

7: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • far apart or greater difference
  • a ling psychrometer doesn't have two theremometers.
  • 2F difference
  • nearly the same

8: How many different groups of refrigerants are there?

  • 3
  • 11
  • 15
  • 7

9: A class B1 refrigerant is considered

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

10: What is a Category "D" fluid?

  • Any fluid that exceeds 150 psig and has design temperature of over 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
  • A typical refrigerant used on newer air conditioning and heat pump ssytems
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F

11: The two basic types of evaporators are

  • direct expansion and plate
  • flooded and direct expansion
  • prime surface and finned
  • finned and plate

12: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 50
  • 75
  • 55
  • 15

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

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

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

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

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

  • amperage
  • resistance
  • capacitance
  • voltage

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

  • True
  • False

17: 1 Watt = ______ BTU's?

  • 3.412
  • 12
  • 7.216
  • 4.482

18: What device should be used on low-temperature freezers?

  • high capacity TXV
  • discharge muffler
  • hot-gas by-pass
  • oil separator

19: 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

20: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • -100F to -40F
  • 30F to 50F
  • -40F to 0F
  • 0F-38F

21: Pressure vessels with an internal volume of 3 cubic feet or more

  • do not need pressure relief protection
  • shall use fusible plugs
  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices

22: If the spring is adjusted to increase the superheat, this new setting will

  • have no effect on the frost line
  • lengthen the frost line
  • allow more liquid into the evaporator
  • shorten the frost line

23: Ammonia (NH3) is a group III refrigerant

  • True
  • False

24: The outer portion of shell of the compressor used on low-pressure chillers is called the

  • suction
  • nozzle
  • baffle
  • volute

25: At higher altitudes, boiling temperatures

  • depends on the refrigerant
  • decrease
  • increase
  • are unaffected