Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: If the power element on an expansion valve should lose its charge, the valve would

  • Close
  • Over feed
  • Stay open
  • Under feed

2: The main purpose of the accumulator is to

  • provide space for vapor to accumulate
  • provide space for the accumulation of oil and containminants
  • prevent liquid slugs at the compressor
  • store liquid refrigerant

3: one BTU equals

  • 3.41 hp
  • Pi
  • 12,000 hp
  • 31.4 hp

4: 746 watts is equal to

  • 10 hp
  • 100 hp
  • 1 hp
  • Pi

5: What is the minimum size wire you can use on a 30 amp circuit?

  • 10 AWG
  • 16 AWG
  • 14 AWG
  • 12 AWG

6: The outer portion of shell of the compressor used on low-pressure chillers is called the

  • baffle
  • volute
  • nozzle
  • suction

7: 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
  • 1.5

8: Each machinery room shall contain

  • high and low pressure controls
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate

9: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 55 lbs
  • 550 lbs
  • 660 lbs
  • 330 lbs.

10: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • negative displacement compressor
  • non-volumetric displacement compressor
  • neutral chamber-type compressor
  • non-positive displacement compressor

11: A class B1 refrigerant is considered

  • non-toxic and non-flammable
  • toxic but non-flammable
  • toxic and somewhat flammable
  • non-toxic but highly flammable

12: Before replacing a seized compressor, the _______ should be determinded.

  • cause of seizure
  • current draw
  • designed head pressure
  • type of refrigerant

13: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

14: How many flammability classifications are refrigerants in?

  • 5
  • 7
  • 3
  • 2

15: 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

16: When air is ducted through a machine room that services occupied space, What must be done?

  • Flanged and gasketed
  • Insulated and cross broke
  • Welded and seamed.
  • Ducted and sealed

17: "R" represents ___ in the Ohm's law formula

  • voltage
  • capacitance
  • resistance
  • amperage

18: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, paper method, and frost line.
  • sight glass, weight, pressure, and dipstick
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and frost line

19: 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.

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

20: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

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

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

22: Bubbles in the liquid line sight glass could be caused by

  • leaking discharge valves in the compressor
  • overcharge of oil
  • plugged drier
  • bad low pressure switch

23: Sensible heat is the heat added to a substance to

  • change its state
  • cause evaporation
  • raise its temperature
  • freeze it

24: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b

25: The equivalent length of pipe in a water piping system is

  • the total length of pipe plus equivalent-length of fittings
  • the total length of pipe as you would measure it
  • the total length of pipe as you would measure it plus 25% for fittigns
  • the total length of pipe plus equivalent of fittings multiplied by 2.31