Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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

2: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 80
  • 100
  • 90
  • 110

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

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

4: Give an example of a secondary coolant?

  • R-12
  • R-410A
  • R-717
  • R-718

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

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

6: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Wet bulb temperature
  • Dry bulb temperature
  • Critical temperature
  • Saturated temperature

7: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

8: The two basic types of evaporators are

  • flooded and direct expansion
  • finned and plate
  • direct expansion and plate
  • prime surface and finned

9: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • the owner shall be informed
  • no flames shall be permitted
  • explosion precautions must be taken
  • gas masks must be worn

10: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 226 psig, 68 psig
  • 350 psig, 120 psig
  • 455 psig, 185 psig
  • 257 psig, 77 psig

11: Which of the following is NOT a positive displacement compressor?

  • scroll
  • screw
  • reciprocating
  • centrifugal

12: 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

13: "P" represents ______ in the Watt's law formula

  • voltage
  • watts
  • amperage
  • reactance

14: Liquid level gauges must be provided with what?

  • A low level mark
  • Automatic shut-offs
  • A relief valve
  • A red line

15: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 125 psig
  • 327 psig
  • 365 psig
  • 255 psig

16: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?

  • Flush with ammonia
  • Flush with R-718
  • Flush with RX-11
  • Flush with R-11

17: The reversing valve is commonly used

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

18: 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)?

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

19: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.

  • 350
  • 100
  • 250
  • 400

20: _____ and its alloys are suitable for use with ammonia systems.

  • Zinc
  • Copper
  • Magnesium
  • Aluminum

21: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is

  • it is hydroscopic
  • it traps moisture
  • viscosity
  • all of the above

22: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices
  • shall use fusible plugs
  • do not need pressure relief protection
  • shall use pressure relief devices or fusible plugs

23: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • the mechanical room housing the refrigeration system
  • the return air ducted system
  • Machinery rooms need not be vented
  • the outdoors

24: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 75
  • 55
  • 15
  • 50

25: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above