Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • 10 amps
  • 20 amps
  • 24 amps
  • There isn't enough information to answer.

2: The reversing valve is commonly used

  • when the code requires a check valve
  • on multiple compressor systems
  • on all heat pumps
  • on commercial system that involve two different temperatures

3: Low-side system leaks in a low-pressure chiller will often result in

  • water being pulled into the system
  • system refrigerant leaking from the system
  • nitrogen leaking out of the system.
  • air being pulled into the system

4: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • blown to the atmosphere by the fan
  • washed out of the air by the spray pump
  • remain in the air
  • accumulate in the sump water

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

  • condenser
  • relief valve
  • bleed valve
  • service valve

6: One ton of refrigeration is defined as ______ btu/minute.

  • 200
  • 720,000
  • 12,000
  • 60

7: Refrigeration piping before being buried shall be

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

8: 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

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

9: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the aggregate of the high side and low side
  • 2.5 times the design pressure
  • the low side
  • the high side

10: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • the same
  • there is no Group B1 refrigerants
  • lower
  • higher

11: 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

12: 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
  • 10-15 psi above low side pressure
  • 10 to 15 psi below low side pressure

13: A solder joint melts at temperatures of

  • 400F to 800F
  • 1,200F to 1,500F
  • 600F to 900F
  • less than 400F

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

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

15: What is the typical air conditioning operating pressures for R-22?

  • 60 psi suction 210 psi discharge
  • 25 psi suction 125 psi discharge
  • 105 psi suction 340 psi discharge
  • None of the above

16: How many flammability classifications are refrigerants in?

  • 2
  • 7
  • 3
  • 5

17: The 522 CMR 9.00 has adopted for reference ASHRAE ____

  • 15
  • 25
  • 10
  • III

18: A self contained system

  • is any system or part of a system used to increase evaporation by expansion or vaporization
  • is a unit system Group I refrigerants only
  • is a complete factory made and tested system
  • is a unit system Group II refrigerants only

19: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

20: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 Kelvin
  • 1 Therm
  • 1 BTU
  • The rate of conduction

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

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

22: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

23: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use fusible plugs
  • shall use pressure relief devices
  • shall use pressure relief devices or fusible plugs
  • shall use rupture discs or duel pressure relief valves

24: What type refrigerant is NOT ozone depleting?

  • CFC
  • HCFC
  • HFC
  • Halon

25: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 1/2"
  • 5/8"
  • 3/8"
  • 3/4"