Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: On cooling towers, what causes the condenser water to drop

  • ambient temperatures
  • tower fans
  • evaporation of the water droplets
  • sensible heat

2: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?

  • Positive displacement
  • Low Pressure displacement
  • Pressure induced displacement.
  • Non-positive displacement

3: What must be done if refrigeration lines pass through a concrete floor?

  • installed through a pipe casing
  • moisture barrier
  • insulated
  • leak checked

4: Heat transferred by conduction from one body to another is done

  • via solids
  • via radiation
  • via liquids
  • via heat rays

5: One atmosphere equals

  • 0 psia
  • 29.4
  • 0 psig
  • 14.7

6: On a single phase motor, when does the start winding cut out?

  • Start windings do no cut-out of the run cycle
  • At 75% of its full rated speed
  • At 25% of its full rated speed
  • At 50% of its full rated speed

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

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

8: A class B1 refrigerant is considered

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

9: In a horizontal shell & tube condenser, the ammonia is liquefied by

  • removing the latent heat of vaporization
  • water sprayed over condenser
  • removing the latent heat of fusion
  • passing thru the tubes from top to bottom

10: What is the leaving chilled water set point for water chiller systems?

  • 55F
  • 45F
  • 66F
  • 38F

11: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • purge
  • surge
  • splurge
  • merge

12: The gauge thickness required on a CO2 tank construction is

  • 1/8"
  • 1/16"
  • 5/16"
  • 3/32"

13: In an electrical circuit, what is potential measured in?

  • Amps
  • Ohms
  • Herys
  • Volts

14: Horizontal piping should be run level.

  • False
  • Yes, if the condenser is located above the evaporator
  • No, unless the supervisor on the job says so.
  • True

15: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

16: 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

17: The certificate of inspection

  • shall be posted and protected from dirt, water, and other elements
  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be authorized by a notarized insurance company
  • shall be posted on the compressor shell or electrical panel at the unit

18: 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

19: Refrigeration piping before being buried shall be

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

20: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

21: What is considered a cooling agent?

  • any liquid used for the transmission of heat without condensation
  • any liquid used for the transmission of heat without vaporization
  • any liquid used for the transmission of heat when vaporization occurs
  • any liquid used for the transmission of heat when condensation occur

22: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

23: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

24: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 977.6 watts
  • 9.776 watts
  • 9,776 watts
  • .9776 watts

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

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