Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.

  • 5.5
  • 2.0
  • 3.0
  • 2.5

2: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?

  • EEV
  • CPR valve
  • Solenoid valve
  • EPR valve

3: A solder joint melts at temperatures of

  • less than 400F
  • 1,200F to 1,500F
  • 600F to 900F
  • 400F to 800F

4: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Pressure Temperature
  • Isothermal
  • Adiabatic
  • Volume Temperature

5: B3 refrigerants are considered

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

6: 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

7: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants
  • Nothing must be done
  • Place sign, check for leaks, and insulate suction line

8: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 24
  • 18
  • 10
  • 15

9: On a centrifugal compressor, stationary diffuser vanes are needed to

  • stop gas flow
  • increase the clearance space
  • prevent high pressure on the packing
  • convert velocity energy to pressure

10: What is the refrigerant dichlorodifluoromethane?

  • R-123
  • R-134A
  • R-22
  • R-12

11: Copper and its alloys shall not be used with ammonia

  • True
  • False

12: 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

13: Booster compressors connect to the ____ side of the compressor

  • liquid
  • oil side
  • vapor
  • low side

14: In a system designed for sub-zero ambient temperatures, what must be added?

  • Infrared dye for leak identification
  • Booster compressor
  • Low-ambient kit
  • Nitrogen

15: The rupture disc on a low-pressure chiller typically releases pressure at

  • 10 psig
  • 5 psig
  • 0 psig
  • 15 psig

16: Where are the three places that the discharge from an ammonia relief valve be piped?

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

17: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

18: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

19: Capacitors are rated in

  • megaohms
  • volt - amperes
  • micro-farads
  • kelvins

20: Three-phase motors have what type of windings?

  • three run windings
  • one start winding and one run winding.
  • three run windings and 3 start windings
  • three start windings

21: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 77F
  • 58F
  • 70F
  • 32F

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

  • baffle
  • nozzle
  • suction
  • volute

23: A start capacitor is wired in _____ with the start windings.

  • series-parallel
  • parallel
  • series
  • junction

24: "I" represents _______ in the Watt's law formula.

  • watts
  • reactance
  • amperage
  • voltage

25: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above