Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Foot valve
  • Moisture indicator
  • Muffler
  • Stop valve

2: Pipe identification labels are required when the system contains more than

  • 110 lbs
  • 120 lbs
  • 55 lbs
  • 65 lbs

3: What type of material can't be used on the outlet of a relief valve?

  • Magnesium alloy
  • PVC
  • Copper
  • Stainless steel

4: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 70F
  • 32F
  • 77F
  • 58F

5: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

6: Which creates more of a heat load?

  • 30% RH
  • 90% RH
  • 50% RH
  • 70% RH

7: At higher altitudes, the boiling point of refrigerant is

  • higher
  • the same
  • equal to the coefficient of water at 32F
  • lower

8: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

9: The generator shell contains the

  • condenser, the evaporator, and the generator
  • condenser and the absorber
  • condenser and the generator
  • evaporator and the absorber

10: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

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

  • 100% of its RLA speed
  • 75% of its RLA speed
  • 25% of its RLA speed
  • 50% of its RLA speed

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

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

13: What is potential measured in?

  • Ohms
  • Volts
  • Henrys
  • Amps

14: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • anemometer
  • hydrometer
  • Psychrometer
  • refractometer

15: How many flammability classifications are refrigerants in?

  • 3
  • 7
  • 2
  • 5

16: What is used to check very low pressure?

  • Manometer
  • Hydrometer
  • Hygrometer
  • Velometer

17: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • of Group B2 refrigerant shall be prohibited
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited
  • shall be prohibited
  • shall not be prohibited

18: The main purpose of the accumulator is to

  • store liquid refrigerant
  • provide space for vapor to accumulate
  • provide space for the accumulation of oil and containminants
  • prevent liquid slugs at the compressor

19: Machinery rooms must be vented to ______?

  • unoccupied spaces
  • outdoors
  • basement
  • neutralizing tank

20: Start to Run windings will have what resistance?

  • Somewhere between the actual start winding and run winding resistance value
  • All will be at equal values
  • The most resistance value
  • The least resistance value

21: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • 2F difference
  • a ling psychrometer doesn't have two theremometers.
  • far apart or greater difference
  • nearly the same

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

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

23: Low pressure systems have what kind of compressor?

  • Rotary
  • Reciprocating
  • Centrifugal
  • Scroll

24: What pipe can not be used for refrigeration?

  • L
  • N
  • K
  • M

25: Bubbles in the liquid line sight glass could be caused by

  • overcharge of oil
  • bad low pressure switch
  • leaking discharge valves in the compressor
  • plugged drier