Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: What is an egress?

  • A code violation
  • An entrance or exit
  • A valve put on the low side of the system to prevent frosting
  • An escape route

3: Total heat of a substance is considered

  • empathetical
  • enthalpy
  • sensible heat
  • specific heat

4: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • the outdoors
  • the return air ducted system
  • the mechanical room housing the refrigeration system
  • Machinery rooms need not be vented

5: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

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

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

7: Which is considered the more efficient condenser?

  • fan cooled
  • spray cooled
  • air cooled
  • water cooled

8: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 75
  • 24
  • 100
  • 50

9: What refrigerant were phased out in 2004?

  • R-12
  • R-134a
  • R-22
  • R-11

10: Ammonia systems use ____ pressure to adjust oil pressure

  • liquid
  • air
  • discharge
  • stream

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

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

12: A class B1 refrigerant is considered

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

13: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

14: A moisture indicator must

  • be sight side up
  • change color when exposed to moisture
  • be filled with liquid
  • be yellow

15: Capacitors are rated in

  • kelvins
  • volt - amperes
  • micro-farads
  • megaohms

16: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 1000F
  • 600F
  • 700F
  • 800F

17: Foaming of oil in a compressor is most likely to occur

  • when ambient temperature are low
  • when the evaporator temperatures are below 32F
  • when there is insufficient air across the condenser(i.e., dirty coil)
  • at start-up

18: Which refrigerant replaced R-12?

  • R-407A
  • R-22
  • R-410A
  • R-134A

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

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

20: Most CFC's are

  • flammable
  • inert but toxic
  • toxic
  • inert

21: A capacitor in series with the start windings will do what?

  • Nothing
  • Decrease the RLA to within 10% of its rating
  • Increase run efficiency by 10% of its rating
  • Increase starting torque

22: The purpose of an accumulator is to

  • reduce friction loss to the flow of refrigerant
  • assure no liquid returns to the compressor
  • store excess refrigerant from the reciver
  • filter out impurities from the system

23: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 365 psig, 120 psig
  • 257 psig, 77 psig
  • 226 psig, 68 psig
  • 455 psig, 185 psig.

24: 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

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

25: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above