Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

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

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

3: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • lost heat
  • specific heat
  • sensible heat
  • latent heat

4: When the compressor is below the condensor

  • traps are needed on the oil return line
  • traps are not needed on this type of system
  • traps are needed on the discharge line
  • traps are needed on the suction line

5: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

6: Horizontal piping should be run level.

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

7: How many closing forces operate a thermostatic expansion valve?

  • 1
  • 4
  • 2
  • 3

8: An oil pressure safety switch should be set at

  • 5 to 10 psi below low side pressure
  • 10-15 psi above low side pressure
  • 5 to 10 psi above low side pressure
  • 10 to 15 psi below low side pressure

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

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

10: An accumulator can be located between the

  • condenser and evaporator
  • first stage and second stage compressors
  • compressor and condenser
  • evaporator and compressor

11: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

12: Increasing superheat will do what to your system?

  • Nothing
  • Increase gas flow
  • Decrease liquid flow
  • Increase liquid flow

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

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

14: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

15: What instrument is used to measure very high resistance?

  • meg ohmmeter
  • tape measure
  • ammeter
  • voltmeter

16: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 1
  • 2
  • 3
  • 5

17: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 22
  • 33
  • 18

18: Capacity control on an absorption system is typically accomplished by varying the

  • pressure setting on the system's rupture disc
  • speed of the chilled water circulatory pump
  • speed of the condenser water circulator pump
  • rate at which heat is supplied to the generator

19: If the suction pressure is low and the evaporator temperature high, the cause will be a?

  • too small evaporator
  • starved evaporator
  • compressor suction valve stuck open
  • overcharged

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

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

21: Which of the following is not an air velocity meter?

  • Anemotherm
  • Velometer
  • Anemometer
  • Hydrometer

22: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • mixed occupancy
  • commercial occupancy
  • public assembly occupancy
  • institutional occupancy

23: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

24: Trichlorofluoromethane is the name of what refrigerant?

  • R-11
  • R-12
  • R-113
  • R-502

25: The best way to detect ammonia in brine is

  • potassium of line
  • nessler regaent
  • carbonation of soda
  • CO2 gas