Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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.

  • 75
  • 15
  • 50
  • 55

2: "E" references ____ in the Ohm's law formula

  • amperage
  • capacitance
  • voltage
  • resistance

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

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

4: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 90
  • 100
  • 110
  • 80

5: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • low side of the system
  • the vapor side of the system
  • the liquid side of the system
  • high side of the system

6: A professional or office building would be considered what type of occupancy?

  • commercial
  • mercantile
  • business
  • public assembly

7: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • relief plug
  • fusible plug
  • rupture plug
  • fusion plug

8: 1 Watt = ______ BTU's?

  • 7.216
  • 3.412
  • 12
  • 4.482

9: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • absorbed solution
  • diluted solution
  • strong solution
  • weak solution

10: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • aquastat
  • immersion controller
  • line voltage t-stat
  • low voltage t-stat

11: It takes how many BTU/hr to melt one pound of ice at 32F

  • 144
  • 212
  • 970
  • 180

12: The critical temperature of a refrigerant gas occurs when

  • any increase in pressure will not liquefy the gas
  • the gas returns to a liquid
  • the gas is no longer saturated
  • any decrease in pressure will cause condensation

13: 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

14: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

15: The low pressure oil safety switch

  • resets itself after the time delay has terminated
  • must be reset manually
  • never trips
  • resets itself automatically

16: A self contained system

  • is a unit system Group II refrigerants only
  • is a complete factory made and tested system
  • is any system or part of a system used to increase evaporation by expansion or vaporization
  • is a unit system Group I refrigerants only

17: The purpose of an accumulator is to

  • assure no liquid returns to the compressor
  • reduce friction loss to the flow of refrigerant
  • store excess refrigerant from the reciver
  • filter out impurities from the system

18: Gauge pressure is

  • what a gauge reads when checking pressures on a chilled water system.
  • force of pressure above that of atmospheric
  • atmospheric pressure
  • absolute pressure

19: Mercury was used in thermometers primarily because it

  • was inexpensive
  • never freezes
  • vaporizes at very high temperatures
  • expands uniformly

20: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

21: All low-pressure chillers use which type of compressor?

  • Reciprocating
  • Rotary
  • Centrifugal
  • Scroll

22: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

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

  • C-3
  • A-3
  • A-1
  • B-2

24: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

25: What is Trichlorotrifluoromethane?

  • R-113
  • R-13
  • R-11
  • R-12