Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: When must refrigeration system covered by the code be inspected?

  • Upon installation
  • Annually and when installed
  • Not required
  • Annually

2: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • “UM” and “UV”
  • “UV”
  • “UL”
  • “U” or “UM”

3: Color is important in oil because

  • it indicates the viscoisty.
  • it makes sight glasses easy to read
  • can tell us something about the refining of oil
  • allows you to see into crankcase

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

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

5: Which of the following is an example of an azeotropic refrigerant?

  • R-404A
  • R-500
  • R-410A
  • R-134A

6: How far from the ground does a relief valve need to be?

  • At least 25' above grade
  • Not more than 3' above grade
  • At least 20' above grade
  • At least 15' above grade

7: A direct system

  • is one which encloses a separate body of evaporative refrigerant
  • is a self-contained complete factory made and tested system
  • is where the refrigerant comes in contact with the space refrigerated
  • is on where brine is cooled & circulated to the space refrigerated

8: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

9: A mercury bulb controller is not recommended for

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

10: One watt of electrical energy in a resistive heater will provide _____ BTU/hr

  • 16.64
  • 34.15
  • 3.415
  • 6.830

11: The evaporator is a device to

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

12: What is the state of the refrigerant leaving the evaporator?

  • a low temperature subcooled liquid
  • a high temperature superheated vapor
  • low temperature superheated vapor
  • a high temperature subcooled liquid

13: What do you need to do when you install a new system?

  • Have it inspected
  • Document the superheat and subcooling reading
  • Insulate the suction line before you take a superheat reading
  • Add refrigerant

14: On a large centrifugal system, what meters the flow to the evaporator?

  • Cap tube.
  • High side float
  • Low side float
  • TXV

15: The heat picked up in the evaporator must equal to

  • the heat giving by the condenser
  • the heat lost by the medium being cooled
  • the heat gained by the condenser
  • the heat of compression

16: Suction valve unloaders afford an effective means of

  • refrigerant control
  • capacity control
  • evaporator control
  • superheat control

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

  • True
  • False

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

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

19: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • public assembly occupancy
  • institutional occupancy
  • illegal occupancy
  • commercial occupancy

20: Which refrigerant replaced R-12?

  • R-407A
  • R-410A
  • R-22
  • R-134A

21: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 125 psig
  • 365 psig
  • 255 psig
  • 327 psig

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

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

23: R-11 has the greatest corrosive effect on

  • Copper
  • Aluminum
  • Magnesium
  • Bronze

24: The measurement of heat in a particular substance is

  • sensible heat
  • latent heat
  • specific heat
  • enthalpy

25: A hotel is considered a _______ occupancy.

  • commercial
  • institutional
  • residential
  • mercantile