Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A restaurant is classified as a

  • public assembly occupancy
  • commercial occupancy
  • mixed occupancy
  • large mercantile occupancy

2: What type of oil is used in R-410A systems?

  • mineral oil
  • polyalkylene glycol (PAG)
  • naphthene
  • polyolester (POE)

3: The two float-type metering devices are the

  • liquid float and the low-side float
  • vapor float and the low-side float.
  • high-side float and the low-side float
  • liquid float and the vapor float

4: RPM's of a centrifugal compressor are at approximately?

  • 15,000
  • 500
  • 30,000
  • 10,000

5: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • purge
  • merge
  • surge
  • splurge

6: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 75%
  • 80%
  • 90%
  • 100%

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

  • 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
  • Section XIII Division of the ASME Boiler & Pressure Code

8: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • Psychrometer
  • refractometer
  • hydrometer
  • anemometer

9: A relief valve discharge capacity is rated in

  • Pounds of air per minute.
  • temperature minus pounds of air per second divided by release rate squared
  • PSIA
  • PSIG

10: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 2
  • 3
  • 4
  • 5

11: Can you use Ammonia in industrial applications?

  • No, never
  • Yes, always
  • Yes, Under certain condidtions
  • When mixed with R-718

12: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 110
  • 1,000
  • 6.6
  • 330

13: How is bring measured?

  • anemometer
  • hydrometer
  • hygrometer
  • manometer

14: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

15: What is not a requirement of a Class T machine room?

  • Automatic ventilation
  • Fire hose connected to the building fire protection system.
  • Self-closing doors
  • Tight fitting doors

16: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • start the fan and circulating pump
  • reset the safety valve
  • reset the expansion valve
  • start the comrpessor

17: Adjusting the spring pressure on a TXV

  • changes subcooling
  • changes superheat
  • makes no difference
  • adjusts the bulb charge

18: Refrigerants shall be classified by

  • color codes
  • toxicity and flammability
  • maximum permissible quantities of each group
  • requirements for commercial, industrial, and residential occupancies

19: Class A refrigerants are considered

  • non-toxic
  • toxic
  • non-flammable
  • flammable

20: How would you know if there was a loss of crankcase pressure?

  • oil level will rise
  • oil will foam
  • oil will thin out
  • oil will thicken

21: 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
  • commercial occupancy
  • illegal occupancy

22: 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

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

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

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

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

25: System design pressures must take into consideration, not only, pressures found during normal operation but also what?

  • When it's cold out
  • When there is a malfunction on the high side
  • When its warm out
  • All of the above