Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

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

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

3: Transformers are rated in

  • amps
  • volt-amps
  • volts-ohms
  • volts

4: When an inspection is needed, how often must it be done?

  • annually
  • every 36 months
  • every 18 months
  • every 24 months

5: What refrigerant doesn't have to be classified?

  • R-134A
  • R-718
  • R-422A
  • R-717

6: What device should be used on low-temperature freezers?

  • hot-gas by-pass
  • high capacity TXV
  • discharge muffler
  • oil separator

7: Sublimation occurs when

  • gas is formed directly from a solid
  • gas is formed from a liquid
  • liquid is formed from a gas
  • ice melts and turns to water

8: Capacitors are rated in

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

9: A water regulating valve opens when

  • the head pressure rises
  • when the power is on there is an overcharge of refrigerant
  • the compressor is on
  • when the power is on

10: A hissing noise at the expansion valve is a good indication that

  • gas is passing thru it
  • nothing is passing thru
  • liquid is passing thru it
  • expansion valve is oversized

11: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within

  • 30 days
  • 2 months
  • 1 week
  • 14 days

12: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the aggregate of the high side and low side
  • the high side
  • the low side
  • 2.5 times the design pressure

13: The best way to detect ammonia in brine is

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

14: When should a relief valve start to function?

  • 10 psi before it's set pressure
  • Two times it's working pressure
  • At it's set pressure
  • Before the purge station discharges

15: Pressure relief valves shall be marked with the data from

  • Section XIII Division of the ASME Boiler & Pressure Code
  • Section I Division VIII of ASME Boiler & Pressure Code
  • Section IV Division of the ASME Boiler & Pressure Code
  • Section VIII Division of the ASME Boiler & Pressure Code

16: Start to Run windings will have what resistance?

  • The least resistance value
  • All will be at equal values
  • Somewhere between the actual start winding and run winding resistance value
  • The most resistance value

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

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

18: Suction line oil traps should be installed when the condenser is

  • on the third floor roof and the evaporator is in the basement
  • in the basement and the evaporator is on the third floor
  • located outside the operates in temperatures below 35F
  • more than 100' away from the evaporator

19: 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

20: Ammonia belongs to Group

  • B-1
  • A-1
  • A-2
  • B-2

21: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

22: 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

23: A mercury bulb controller is not recommended for

  • low voltage use
  • line voltage use
  • line or low voltage use
  • use where vibration is severe

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

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

25: 746 watts is equal to

  • 10 hp
  • Pi
  • 1 hp
  • 100 hp