Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: 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)?

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

3: What is the refrigerant dichlorodifluoromethane?

  • R-134A
  • R-123
  • R-22
  • R-12

4: What is the maximum voltage range allowed on an electrical circuit?

  • 20%
  • 5%
  • 15%
  • 10%

5: What refrigerant were phased out in 2004?

  • R-11
  • R-12
  • R-22
  • R-134a

6: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 22
  • 18
  • 50
  • 33

7: Ammonia vaporization takes place at what temperature?

  • -32F
  • -28F
  • -110F
  • -460F

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

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

9: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • non-volumetric displacement compressor
  • non-positive displacement compressor
  • negative displacement compressor
  • neutral chamber-type compressor

10: If the power element on an expansion valve should lose its charge, the valve would

  • Stay open
  • Close
  • Under feed
  • Over feed

11: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above

12: If the power element of an expansion valve should lose its charge the valve would

  • underfeed the evaporator
  • overfeed the evaporator
  • go open
  • go closed

13: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 5
  • 2
  • 1
  • 3

14: 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

15: How many different groups of refrigerants are there?

  • 15
  • 7
  • 3
  • 11

16: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • Simple
  • Cascade
  • Low pressure
  • R-414B

17: What is used to check very low air pressures in air conditioning duct?

  • Barometer
  • Anemomter
  • Vacuum gauge
  • Manometer

18: An example of an "Expendable Refrigerant" is

  • liquid oxygen
  • liquid nitrogen
  • ammonia
  • lithium bromide

19: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above

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

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

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

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

22: Thermodynamics is the branch of science that deals with

  • molecular therory
  • state of energy
  • heat energy
  • energy due to motion

23: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Wet bulb temperature
  • Saturated temperature
  • Dry bulb temperature
  • Critical temperature

24: Atmospheric pressure is equal to

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

25: How many flammability classifications are refrigerants in?

  • 7
  • 2
  • 3
  • 5