Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • business
  • mercantile
  • public assembly
  • commercial

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

  • magnesium
  • copper
  • black iron
  • stainless steel

3: Fusible plugs shall not be used with pressure vessels of

  • 3 cubic feet or more
  • 3 cubic feet or less
  • 15 square feet or less
  • 15 cubic feet or more

4: What is the leaving chilled water set point for water chiller systems?

  • 45F
  • 55F
  • 38F
  • 66F

5: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

6: When air is ducted through a machine room that services occupied space, What must be done?

  • Insulated and cross broke
  • Welded and seamed.
  • Flanged and gasketed
  • Ducted and sealed

7: On a single phase motor, when does the start winding cut out?

  • At 50% of its full rated speed
  • At 25% of its full rated speed
  • At 75% of its full rated speed
  • Start windings do no cut-out of the run cycle

8: A start capacitor in series with a start winding will

  • increase running efficiency
  • increase the amp draw of the motor
  • decrease the amp draw of the motor
  • increase starting torque

9: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

10: What device measures the specific gravity of a substance?

  • Manometer
  • Thermometer
  • Hydrometer
  • Hygrometer

11: Which is the lowest vacuum?

  • 10 psia
  • 5 psig
  • 1,000 Microns
  • 5" hg

12: 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

13: Volts x amps equals

  • Impedance
  • Watts
  • Inductance
  • Ohms Law

14: Oils, classified as to source, are

  • animal, vegetable, and castor
  • animal, vegetable, and mineral
  • naphthalene, paraffin, and castor
  • naphthalene, mixed, and paraffin

15: 1 Watt = ______ BTU's?

  • 4.482
  • 3.412
  • 7.216
  • 12

16: R-12 is

  • dichloromethane
  • trichlorofluoromethane
  • dichlorodifluoromethane
  • dichlorofluoromethane

17: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code

  • licensed technician
  • licensed welder
  • competent welder
  • welder qualified

18: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the low side
  • the aggregate of the high side and low side
  • the high side
  • 2.5 times the design pressure

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

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

20: In an A/C unit, dirty filters will cause

  • high discharge pressure
  • high suction pressur
  • low oil pressure
  • low suction pressure

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

  • Manometer
  • Barometer
  • Vacuum gauge
  • Anemomter

22: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

23: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

24: 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

25: The rupture disc on a low-pressure chiller typically releases pressure at

  • 5 psig
  • 10 psig
  • 15 psig
  • 0 psig