Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • 4
  • 1
  • 2
  • 3

2: How can you test mechanical strength of an electrical connection?

  • measure ohms with an electrical meter
  • measure voltage across the connection
  • attempt to pull the wire from the connector by hand
  • none of the above.

3: Give an example of a secondary coolant?

  • R-12
  • R-718
  • R-410A
  • R-717

4: Pressure is equivalent of

  • Force / Area
  • Force
  • Force X Area
  • Area X Force

5: R22 and 410A operate at the same range of condensing and evaporating temperatures

  • true
  • false

6: When using nitrogen for brazing, the pressure should be:

  • Very low
  • Slightly below atmospheric
  • 125 psig
  • 50-100 psig

7: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 75
  • 15
  • 50
  • 55

8: 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

9: When can 50/50 solder be used?

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

10: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • evaporator
  • compressor
  • boiler
  • outside the machinery room

11: What type of relief valve is used on a CO2 system?

  • glove disc
  • gate valve
  • rupture disc
  • fusible plug

12: How many flammability classifications are refrigerants in?

  • 2
  • 5
  • 3
  • 7

13: Halogenated refrigerants cannot be used with what material?

  • Copper
  • Stainless steel
  • Magnesium alloy
  • Aluminum

14: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are

  • gate or globe valves
  • companion or block valves
  • ball valves
  • king valves

15: 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

16: 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”

17: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • Low pressure
  • R-414B
  • Simple
  • Cascade

18: The formula for Pure Power in a resistance circuit is

  • Watts X amps.
  • Kw = volts X amps
  • Watts X power factor
  • Watts = volts X amps

19: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

20: Can ammonia be used on domestic system?

  • no, unless there is proper ventilation system installed
  • yes, for systems under 10 tons
  • no
  • yes

21: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

22: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • shall have a pressure limiting device installed on the high side of the system
  • shall have a pressure limiting device and a pressure relief valve installed
  • does not require a pressure-limiting device
  • shall be inspected by the Boiler of Inspectors bi-annually

23: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

24: Doors communicating with outside from a mechanical room must be?

  • Self-closing, approved, fire door
  • Self-closing, wooden, fire door
  • Steel, approved, weather-stripped
  • Self-closing, aligned, fire door

25: Booster compressors, pump refrigerant into the

  • receiver
  • heat & plate heat exchanges
  • low side of the primary compressor
  • high side of the secondary compressor