Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

2: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 75%
  • 100%
  • 90%
  • 80%

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

  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection
  • shall use pressure relief devices
  • shall use fusible plugs

4: A relief valve shall be located at least ___ above grade.

  • 36'
  • 15'
  • 25'
  • 10'

5: What is the typical air conditioning operating pressures for R-22?

  • 60 psi suction 210 psi discharge
  • 25 psi suction 125 psi discharge
  • 105 psi suction 340 psi discharge
  • None of the above

6: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 116
  • 88
  • 108
  • 38

7: High pressure controls should be set no higher than

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

8: Viscosity is

  • the coefficient of external friction
  • a measure of heat content
  • the ability of oil to flow
  • measure of weight

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

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

10: Booster compressors, pump refrigerant into the

  • heat & plate heat exchanges
  • receiver
  • low side of the primary compressor
  • high side of the secondary compressor

11: Total heat of a substance is considered

  • empathetical
  • enthalpy
  • sensible heat
  • specific heat

12: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

13: Low pressure systems have what kind of compressor?

  • Rotary
  • Scroll
  • Centrifugal
  • Reciprocating

14: The high side float assembly meters refrigerant into the evaporator through the

  • lower chamber of the low side
  • upper chamber of the high side
  • lower chamber of the high side
  • upper chamber of the low side

15: Ammonia can come in contact with _______ ?

  • Copper tubing
  • Brass
  • Copper
  • Aluminum

16: The two basic types of evaporators are

  • flooded and direct expansion
  • prime surface and finned
  • direct expansion and plate
  • finned and plate

17: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

18: Horizontal piping should be run level.

  • False
  • Yes, if the condenser is located above the evaporator
  • No, unless the supervisor on the job says so.
  • True

19: Absolute pressure is

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

20: Where are the three places that the discharge from an ammonia relief valve be piped?

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

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

  • 5%
  • 15%
  • 20%
  • 10%

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

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

23: A hotel is considered a _______ occupancy.

  • residential
  • institutional
  • commercial
  • mercantile

24: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

25: Thermodynamics is the branch of science that deals with

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