Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Booster compressors, pump refrigerant into the

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

2: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • centrifugal switch
  • duel-voltage switch
  • motor starter
  • printed circuit board (PCB)

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

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

4: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • decreases
  • increases
  • run as designed with low ambient controls
  • doesn't change

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

  • 58F
  • 77F
  • 70F
  • 32F

6: The location of a thermal bulb of a TXV affects

  • the amount of liquid in the condenser.
  • the amount of liquid returning to the compressor
  • the amount of liquid refrigerant in the evaporator
  • subcooling

7: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

8: What type of oil is used in R-410A systems?

  • mineral oil
  • naphthene
  • polyolester (POE)
  • polyalkylene glycol (PAG)

9: What happens after your initial inspection of a pressure vessel?

  • Inspector leaves a metal tag with a certification listed on it
  • Notify the AHJ to let them know that the system been inspected
  • Notify the Fire Marshal that the system has been inspected and approved
  • There is a temporary shut-down until a final inspection can be performed.

10: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

11: The proper location for an oil separator is between the

  • compressor and condenser
  • receiver and metering device
  • condenser and receiver
  • evaporator and compressor

12: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

13: Transformers are rated in

  • volt-amps
  • volts
  • volts-ohms
  • amps

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

  • Stainless Steel
  • Aluminum
  • Copper
  • PVC

15: Copper and its alloys shall not be used with ammonia

  • True
  • False

16: The equivalent length of pipe in a water piping system is

  • the total length of pipe plus equivalent-length of fittings
  • the total length of pipe plus equivalent of fittings multiplied by 2.31
  • the total length of pipe as you would measure it plus 25% for fittigns
  • the total length of pipe as you would measure it

17: Refrigerant restricted in 2004 but used for transition for decades:

  • R-11
  • R-22
  • R-134A
  • R-123

18: Volts x amps equals

  • Watts
  • Ohms Law
  • Impedance
  • Inductance

19: On a large centrifugal system, what meters the flow to the evaporator?

  • TXV
  • Cap tube.
  • High side float
  • Low side float

20: How many groups of refrigerants are there?

  • 3
  • 1
  • 7
  • 5

21: Pressure is equivalent of

  • Force
  • Force / Area
  • Area X Force
  • Force X Area

22: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • is a reciprocating type compressor with 2 or more pistons

23: Low pressure chiller systems use what type of compressor?

  • Reciprocating
  • Centrifugal
  • Screw
  • Scroll

24: The low pressure oil safety switch

  • resets itself automatically
  • must be reset manually
  • resets itself after the time delay has terminated
  • never trips

25: When energized, a normally open relay will be

  • open
  • depends on the type and class of the relay
  • noisy
  • closed