Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Halogenated refrigerants cannot be used with what material?

  • Copper
  • Aluminum
  • Stainless steel
  • Magnesium alloy

2: How much refrigerant can be stored in a mechanical room outside of the system?

  • 330
  • 200
  • 150
  • 100

3: The actual expansion curve of compressor follows most nearly which one of the following

  • Pressure-Temperature
  • Isothermal
  • Volume
  • Adiabatic

4: What refrigerant doesn't have to be classifted?

  • R-718
  • R-134a
  • R-717
  • R-711

5: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1.2
  • 2.2
  • 1.5
  • 1

6: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?

  • R-113
  • R-22
  • R-11
  • R-12

7: A halide torch is most useful with a freon compression system

  • to remove from from TXV's and evaporator coils
  • to sweat flanges on the refrigeration piping
  • to detect refrigeration leaks in piping joints
  • to release a sticking valve

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

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

9: Secondary refrigerants are usually

  • alcohol
  • expensive
  • water or brine
  • Prestone anti-freeze

10: 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

  • evaporator
  • outside the machinery room
  • compressor
  • boiler

11: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • institutional occupancy
  • illegal occupancy
  • public assembly occupancy
  • commercial occupancy

12: R-11 belongs to Group

  • B-3
  • A-1
  • A-2
  • B-1

13: Direct systems using Group II refrigerants

  • shall be installed per instruction of the AHJ
  • shall not be used for air condition for human comfort
  • shall be allowed to be used for human comfort.
  • shall be installed in Class T machinery rooms

14: What is R-22?

  • CCFCM
  • HFC
  • Chlorodifluoromethane
  • Chlorofluoromethane

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: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above

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

  • Reciprocating
  • Scroll
  • Centrifugal
  • Screw

18: Total heat of a substance is considered

  • specific heat
  • enthalpy
  • empathetical
  • sensible heat

19: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • anemometer
  • hydrometer
  • refractometer
  • Psychrometer

20: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

21: Gauge pressure is

  • atmospheric pressure
  • force of pressure above that of atmospheric
  • what a gauge reads when checking pressures on a chilled water system.
  • absolute pressure

22: What type of copper is not permitted on refrigeration systems?

  • Type M
  • Type N
  • Type K
  • Type L

23: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • Because it's cheap
  • Because it's water
  • Because it's a non-flammable refrigerant
  • R-718 is not rated unlimited because it's a dangerous refrigerant

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

  • 25'
  • 15'
  • 20'
  • 30'

25: Excessive head pressure is often caused by

  • leaking reed valve on the discharge side
  • insufficient refrigerant
  • air cooled condenser is plugged
  • thermostat set too high