Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The density of a gas refers to

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

2: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?

  • Circuit Breaker
  • T&P device
  • Relief valve
  • Temperature limiter device

3: A restaurant is classified as a

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

4: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

5: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • orange
  • red
  • blue
  • green

6: What is the refrigerant chlorodifluoromethane?

  • R-123
  • R-12
  • R-22
  • R-134a

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

  • R-718
  • methyl chloride
  • trichlorotrifluoromethane
  • ammonia

8: A class A3 refrigerant is considered

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

9: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 70F
  • 58F
  • 77F
  • 32F

10: Where a refrigeration or air conditioning system is installed,

  • it shall not be operated below prescribed pressuers
  • A field inspection shall be made before it is put into service
  • the form or certificate shall be authorized by the Department of Public Safety
  • The company who installed the system must notify the fire department in the jurisdiction where installed

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

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

12: An example of an "Expendable Refrigerant" is

  • liquid nitrogen
  • liquid oxygen
  • lithium bromide
  • ammonia

13: High pressure controls should be set no higher than

  • 10% of set point
  • 80% of set point
  • 90% of set point
  • 25% of set point

14: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

15: Atmospheric pressure is equal to

  • 29.92" Hg
  • 14.7 psia
  • 14.7 psig
  • both a & b

16: B3 refrigerants are considered

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

17: Dew point is

  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to evaporate
  • the temperature of air of 50% RH
  • the temperature below which water vapor in the air will start to condense

18: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • Because it's water
  • Because it's cheap
  • R-718 is not rated unlimited because it's a dangerous refrigerant
  • Because it's a non-flammable refrigerant

19: Pressure is equivalent of

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

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

  • junction
  • series
  • series-parallel
  • parallel

21: Evaporators within 18" of a heating coil must be equipped with a

  • high limit control
  • pressure relief device
  • low limit control
  • zone valve

22: How are a compressor and condenser fan wired?

  • series-parallel
  • series
  • parallel-series
  • parallel

23: Electricity involves the movement of electrons in atoms

  • True
  • False

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 device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • centrifugal switch
  • printed circuit board (PCB)
  • motor starter
  • duel-voltage switch