Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: In an electrical circuit, what is potential measured in?

  • Herys
  • Ohms
  • Volts
  • Amps

2: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of high temperature evaporator
  • inlet of the low temperature evaporator.
  • outlet of low temperature evaporator
  • outlet of the liquid line

3: On a large centrifugal system, what meters the flow to the evaporator?

  • Cap tube.
  • Low side float
  • TXV
  • High side float

4: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?

  • 12,000 BTU
  • 970 BTU
  • 144 BTU
  • 24,000 BTU

5: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

6: Pressure is equivalent of

  • Area X Force
  • Force
  • Force / Area
  • Force X Area

7: One atmosphere equals

  • 0 psia
  • 14.7
  • 29.4
  • 0 psig

8: How many forces operate a thermostatic expansion valve?

  • 3
  • 4
  • 2
  • 1

9: A start capacitor is wired in _____ with the start windings.

  • series-parallel
  • parallel
  • junction
  • series

10: What refrigerant doesn't have to be classified?

  • R-422A
  • R-718
  • R-134A
  • R-717

11: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

12: Pi equals approximately

  • 3.41
  • 12,000
  • 3.14
  • 746

13: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • R-718
  • methyl chloride
  • ammonia
  • trichlorotrifluoromethane

14: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

15: The density of a gas refers to

  • pounds per cubic foot
  • cubic feet per pound
  • pounds per square foot
  • pounds per absolute pressure

16: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.

  • 75
  • 15
  • 50
  • 20

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

  • Zinc
  • Aluminum
  • Magnesium
  • Copper

18: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 1,000
  • 330
  • 6.6
  • 110

19: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • higher
  • lower
  • there is no Group B1 refrigerants
  • the same

20: Halogen refrigerants are corrosive to which type of metal?

  • black iron
  • magnesium
  • stainless steel
  • copper

21: How many refrigerant classifications are there for toxicity?

  • 2
  • 3
  • 1
  • 5

22: In a motor, an internal overload might open if

  • there's a direct short
  • there's an open start winding
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's an excess current draw through the motor

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

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

24: The difference between saturated liquid and saturated vapor is

  • heat
  • pressure
  • volume
  • temperature

25: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 66
  • 22
  • 50
  • 25