Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: How many gallons of water per pound of ammonia do you need?

  • 5
  • 20
  • 15
  • 1

2: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

3: RPM's of a centrifugal compressor are at approximately?

  • 30,000
  • 15,000
  • 500
  • 10,000

4: The freezing point of water at sea level is?

  • 32C
  • 0F
  • 32F
  • -10C

5: The leaving chilled water set point for comfort cooling is typically?

  • 45
  • 60
  • 66
  • 38

6: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • fusion plug
  • relief plug
  • rupture plug
  • fusible plug

7: On a TXV, the purpose of an external equalizer is to?

  • balance the evaporator load
  • compensate for a pressure drop across the evaporator coil
  • allow a greater adjustment spam
  • Increase the pressure on the top of the power head diaphragm

8: What must be done to refrigerant pipes before being buried?

  • Coated
  • Certified
  • Encased
  • Leaked checked

9: Crankcase heaters are energized

  • when the compressor is off
  • to allow easy compressor start-up
  • while the compressor is running
  • to prevent compressor freeze-up

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

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

11: A low oil switch is typically

  • manual reset
  • automatic reset
  • time-delay auto reset
  • non used on semi-hermetic compressors over 10 ton capacity

12: What is not a requirement of a class T machine room?

  • self-closing doors
  • automatic ventilation
  • fire hose connection to the building fire protection system
  • tight fitting doors

13: Suction valve unloaders afford an effective means of

  • evaporator control
  • superheat control
  • capacity control
  • refrigerant control

14: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 18
  • 10
  • 15
  • 24

15: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • .1
  • 1.2
  • 1.7
  • .8

16: What is Trichlorotrifluoromethane?

  • R-11
  • R-13
  • R-113
  • R-12

17: 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

18: Where is an EPR valve located on a multi-evaporator system?

  • Suction line of the warmest evaporator
  • Suction line at the compressor
  • Suction line of the coolest evaporator
  • Suction line prior to the accumulator of the lowest temperature system

19: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • shall have a pressure limiting device and a pressure relief valve installed
  • shall be inspected by the Boiler of Inspectors bi-annually
  • does not require a pressure-limiting device
  • shall have a pressure limiting device installed on the high side of the system

20: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

21: On a pumpdown system, the liquid-line solenoid is controlled by the

  • low-ambient controller
  • low pressure switch
  • thermostat
  • defrost timer

22: What is the purpose of suction/discharge traps?

  • to ensure proper oil return to the compressor
  • to keep oil inside the evaporator for proper oil return to the compressor
  • to keep oil inside of the accumulator for proper return to the compressor
  • all of the above

23: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?

  • 144 BTU
  • 12,000 BTU
  • 24,000 BTU
  • 970 BTU

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

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

25: Low ambient controls are used when

  • economizers are used
  • always
  • when systems run all year round
  • on air conditioning systems only