Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Increasing superheat will do what to your system?

  • Nothing
  • Increase liquid flow
  • Increase gas flow
  • Decrease liquid flow

2: Can you use Ammonia in industrial applications?

  • When mixed with R-718
  • Yes, Under certain condidtions
  • Yes, always
  • No, never

3: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

4: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

5: 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)?

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

6: Single compound Refrigerants are classified by what two criteria?

  • Flammability and toxicity
  • Flammability and temperature range
  • Temperature range and hazardousness
  • Weight and color

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

  • 75%
  • 80%
  • 100%
  • 90%

8: When using nitrogen for brazing, the pressure should be:

  • 125 psig
  • 50-100 psig
  • Very low
  • Slightly below atmospheric

9: Cooling tower lowers condenser water temp by

  • running fans at 100%
  • evaporative cooling
  • running water thru a secondary heat exchanger
  • condensation

10: Which refrigerant replaced R-12?

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

11: "R" represents ___ in the Ohm's law formula

  • voltage
  • resistance
  • capacitance
  • amperage

12: 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

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

13: Ammonia (NH3) is a group III refrigerant

  • True
  • False

14: R-12 is

  • dichloromethane
  • trichlorofluoromethane
  • dichlorodifluoromethane
  • dichlorofluoromethane

15: Class T machine room

  • shall have refrigerant leak detecting systems installed inside and outside the room
  • has no flame producing apparatus permanently installed
  • shall have remote controls to stop the action of the refrigerant compressor
  • shall include closets used for setting equipment

16: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?

  • it would cause the condenser to sweat
  • it would make the condenser more efficient
  • it would have no effect on the condenser
  • it would make the condenser less efficient

17: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 22 lbs
  • 6.6 lbs
  • 13.9 lbs
  • 44 lbs

18: What is Absolute Zero?

  • -460F
  • -400F
  • -640F
  • -773F

19: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

20: Where can 50/50 solder be used on?

  • suction line
  • liquid line
  • discharge line
  • none of the above

21: R-410A is classified as a ____ refrigerant on the safety matrix.

  • B-2
  • A-2
  • A-1
  • B-1

22: Start to Run windings will have what resistance?

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

23: A professional or office building would be considered what type of occupancy?

  • public assembly
  • commercial
  • business
  • mercantile

24: How far from the ground does a relief valve need to be?

  • At least 25' above grade
  • Not more than 3' above grade
  • At least 20' above grade
  • At least 15' above grade

25: The density of a gas refers to

  • pounds per cubic foot
  • cubic feet per pound
  • pounds per square foot
  • pounds per absolute pressure