Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is the purpose of a surge capacitor on a contactor?

  • to protect low voltage equipment
  • to provide smoother start/stops
  • to balance the sine waves
  • to keep the contactor pulled in

2: R22 and 410A operate at the same range of condensing and evaporating temperatures

  • true
  • false

3: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

4: What refrigerant were phased out in 2004?

  • R-12
  • R-134a
  • R-11
  • R-22

5: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • latent heat
  • specific heat
  • sensible heat
  • lost heat

6: Total heat of a substance is considered

  • empathetical
  • enthalpy
  • sensible heat
  • specific heat

7: How many flammability classifications are refrigerants in?

  • 3
  • 5
  • 7
  • 2

8: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 90
  • 100
  • 80
  • 110

9: An example of direct system is

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

10: Capacity control on a centrifugal compressor is accomplished by the

  • post-rotational guide vanes
  • slide vanes
  • pre-rotational guide vanes
  • check valves

11: Suction line oil traps should be installed when the condenser is

  • in the basement and the evaporator is on the third floor
  • located outside the operates in temperatures below 35F
  • more than 100' away from the evaporator
  • on the third floor roof and the evaporator is in the basement

12: How much refrigerant can be stored in a mechanical room outside of the system?

  • 150
  • 200
  • 330
  • 100

13: Low-side system leaks in a low-pressure chiller will often result in

  • air being pulled into the system
  • system refrigerant leaking from the system
  • water being pulled into the system
  • nitrogen leaking out of the system.

14: Gauge pressure is

  • Barometric pressure
  • Force of pressure above that of atmosphere
  • Atmospheric pressure
  • Absolute pressrue

15: 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

16: All low-pressure chillers use which type of compressor?

  • Reciprocating
  • Scroll
  • Centrifugal
  • Rotary

17: Lithium-bromide, Li-Br, is best characterized as a

  • salt
  • sugar
  • soil
  • sand

18: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • explosion precautions must be taken
  • gas masks must be worn
  • the owner shall be informed
  • no flames shall be permitted

19: Sublimation occurs when

  • gas is formed directly from a solid
  • ice melts and turns to water
  • gas is formed from a liquid
  • liquid is formed from a gas

20: Absolute pressure is

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

21: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • 2.5
  • There isn't enough information to answer.
  • 1250
  • 2

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

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

23: What would be the classification of a prison?

  • Large mercantile
  • Institutional
  • Industrial
  • Place of assembly

24: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

25: Indirect systems using Group II refrigerants

  • shall be used for mechanical equipment only
  • shall be used in refrigeration system in excess of 1,000 lbs
  • shall have all refrigerant containing parts except piping, installed in a Class T machine room
  • shall be used in refrigeration system less than 1,000 lbs