Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 255 psig
  • 365 psig
  • 125 psig
  • 327 psig

2: Name a CFC refrigerant(s):

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

3: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use fusible plugs
  • shall use rupture discs or duel pressure relief valves
  • shall use pressure relief devices

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

  • stainless steel
  • black iron
  • magnesium
  • copper

5: What refrigerant is an inorganic compound?

  • R-22
  • R-132A
  • Ammonia
  • R-410A

6: Which of the following is not an air velocity meter?

  • Anemometer
  • Anemotherm
  • Velometer
  • Hydrometer

7: R-12 is

  • dichlorofluoromethane
  • dichloromethane
  • trichlorofluoromethane
  • dichlorodifluoromethane

8: The difference between saturated liquid and saturated vapor is

  • volume
  • pressure
  • heat
  • temperature

9: What is not a requirement of a Class T machine room?

  • Automatic ventilation
  • Tight fitting doors
  • Self-closing doors
  • Fire hose connected to the building fire protection system.

10: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

11: When using nitrogen for brazing, the pressure should be:

  • Very low
  • 50-100 psig
  • Slightly below atmospheric
  • 125 psig

12: Pressure relief valves shall be marked with the data from

  • Section VIII Division of the ASME Boiler & Pressure Code
  • Section XIII Division of the ASME Boiler & Pressure Code
  • Section I Division VIII of ASME Boiler & Pressure Code
  • Section IV Division of the ASME Boiler & Pressure Code

13: Low pressure systems have what kind of compressor?

  • Rotary
  • Reciprocating
  • Centrifugal
  • Scroll

14: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • oil in evaporator
  • moisture in the system
  • low head pressure
  • not enough oil in the system

15: Increasing superheat will do what to your frost line?

  • Could either increase or decrease depending on the load conditions
  • Decrease
  • Nothing
  • Increasae

16: Crankcase heaters are energized

  • while the compressor is running
  • to allow easy compressor start-up
  • to prevent compressor freeze-up
  • when the compressor is off

17: What measures gas pressure?

  • Manometer
  • Hydrometer
  • Hygrometer
  • Barometer

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

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

19: A normal operating evaporator temperature of R-22 for air conditioning is typically

  • 32F
  • 45F
  • 58F
  • 55F

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

  • 50
  • 18
  • 33
  • 22

21: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 5
  • 4
  • 3
  • 2

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

  • 50
  • 20
  • 15
  • 75

23: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

24: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

25: How are a compressor and condenser fan wired?

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