Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

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

  • suction
  • nozzle
  • baffle
  • volute

3: "I" represents ____ in the Ohm's law formula.

  • capacitance
  • resistance
  • amperage
  • voltage.

4: 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

5: The formula for Pure Power in a resistance circuit is

  • Kw = volts X amps
  • Watts X power factor
  • Watts = volts X amps
  • Watts X amps.

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

7: 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

8: What is a Category "D" fluid?

  • Any fluid that exceeds 150 psig and has design temperature of over 366F
  • A typical refrigerant used on newer air conditioning and heat pump ssytems
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact

9: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

10: What is potential measured in?

  • Henrys
  • Volts
  • Amps
  • Ohms

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

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

12: What device measures the specific gravity of a substance?

  • Hygrometer
  • Manometer
  • Thermometer
  • Hydrometer

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

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

14: 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.

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

15: Ohm's Law indicates Amps X Resistance = ___________.

  • Ohms
  • Volts
  • Current
  • Impedance

16: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will stop cooling and solution will crystallize
  • The machine will cool excessively as the solution evaporates
  • The machine will cool excessively as the solution crystallizes.
  • The machine will stop cooling and the solution will evaporate.

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

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

18: Pressure is the equivalent of

  • force per unit area
  • force times area
  • area times force
  • force

19: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 40'
  • At least 30'
  • At least 20'
  • There is no minimum for relief valve and windows.

20: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 1%
  • 4%
  • 2%
  • 25%

21: The Board of Boilers adopts by reference

  • the 1997 ANSI/ASHRAE Safety Code
  • the MACS Pressure Vessel Code of Massachusetts
  • MSCA Code
  • Montreal Protocol Safety Code

22: R-22 is considered a(n)

  • HCFC
  • HCFCH
  • CFC
  • HFC

23: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

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

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

25: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

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