Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: Oils, classified as to source, are

  • naphthalene, mixed, and paraffin
  • animal, vegetable, and castor
  • animal, vegetable, and mineral
  • naphthalene, paraffin, and castor

3: Fusible plugs shall not be used with pressure vessels of

  • 15 cubic feet or more
  • 3 cubic feet or more
  • 15 square feet or less
  • 3 cubic feet or less

4: How is bring measured?

  • hydrometer
  • manometer
  • hygrometer
  • anemometer

5: What is a megaohm meter?

  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.

6: R-717 is

  • water
  • carbon dioxide
  • ammonia
  • trichloromethane

7: When an electronic bridge is in balance the bridge output will be

  • 0 volts
  • 1 volt
  • .01 volts
  • 15 volts

8: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

9: All low-pressure chillers use which type of compressor?

  • Reciprocating
  • Scroll
  • Centrifugal
  • Rotary

10: Halogenated refrigerants cannot be used with what material?

  • Stainless steel
  • Magnesium alloy
  • Copper
  • Aluminum

11: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

12: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • the vapor side of the system
  • low side of the system
  • the liquid side of the system
  • high side of the system

13: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

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

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

15: What would be the classification for Stop & Shop grocery store?

  • Industrial
  • Place of assembly
  • Instituional
  • Large mercantile

16: The evaporator is a device to

  • remove heat from the refrigeration system
  • Keep the compressor busy
  • absorb heat into the refrigeration system
  • store liquid refrigerant

17: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • of Group B2 refrigerant shall be prohibited
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited
  • shall be prohibited
  • shall not be prohibited

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

19: What is used to check very low pressure?

  • Velometer
  • Hygrometer
  • Manometer
  • Hydrometer

20: The absorber shell contains the

  • evaporator and the absorber
  • condenser and the generator
  • condenser, the evaporator, and the generator
  • condenser and the absorber

21: Who is permitted to access a refrigeration machine room?

  • Contractors only
  • Anyone, it's a completely safe area
  • Authorized persons only
  • Any employee

22: Institutional occupancy is

  • a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • None of the above

23: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • fusion plug
  • fusible plug
  • rupture plug
  • relief plug

24: Total heat of a substance is considered

  • specific heat
  • empathetical
  • sensible heat
  • enthalpy

25: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False