Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 257 psig, 77 psig
  • 226 psig, 68 psig
  • 365 psig, 120 psig
  • 455 psig, 185 psig.

2: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.

  • 100
  • 350
  • 550
  • 50

3: 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)
  • motor starter
  • centrifugal switch
  • duel-voltage switch

4: Suction valve unloaders afford an effective means of

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

5: Low pressure systems have what kind of compressor?

  • Rotary
  • Reciprocating
  • Centrifugal
  • Scroll

6: A relief valve shall be located at least ___ above grade.

  • 25'
  • 36'
  • 10'
  • 15'

7: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

8: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 99%
  • 80%
  • 75%
  • 90%

9: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within

  • 30 days
  • 2 months
  • 14 days
  • 1 week

10: What measures gas pressure?

  • Manometer
  • Hydrometer
  • Hygrometer
  • Barometer

11: What is the refrigerant dichlorodifluoromethane?

  • R-12
  • R-22
  • R-134A
  • R-123

12: 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

13: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

14: R-123 belongs to Group

  • B-3
  • A-3
  • B-2
  • B-1

15: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

16: An oil pressure safety switch should be set at

  • 5 to 10 psi above low side pressure
  • 5 to 10 psi below low side pressure
  • 10 to 15 psi below low side pressure
  • 10-15 psi above low side pressure

17: Which occupancy can ammonia be used in?

  • industrial
  • depends on the quantity of freon
  • commercial
  • redifential

18: Pressure vessels having an inside diameter of 6” or less shall be protected by

  • Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
  • either a fusible plug or a pressure relief device
  • a fusible plug
  • a pressure relief device

19: A pressure relief should be located at least _______ from windows and doors.

  • 25'
  • 30'
  • 15'
  • 20'

20: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • boiler
  • outside the machinery room
  • evaporator
  • compressor

21: How many groups of refrigerants are there?

  • 1
  • 5
  • 7
  • 3

22: Absolute pressure is

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

23: How many volts would you read on a 480V system phase to phase?

  • 480
  • 277
  • 1/3 the voltage

24: Class A refrigerants are considered

  • non-flammable
  • flammable
  • toxic
  • non-toxic

25: Stop valves shall not be permitted between the system and the

  • relief valve
  • bleed valve
  • service valve
  • condenser