Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: How are safety controls wired in a circuit?

  • Parallel
  • Either series or parallel
  • Series
  • Series/parallel

2: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection
  • over pressure protection and a rupture disc
  • over pressure protection as well as a temperature protection device

3: A declaration test is needed when the system contains more than

  • 55 lbs
  • 120 lbs
  • 65 lbs
  • 110 lbs

4: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

5: How many opening forces operate a thermostatic expansion valve?

  • 2
  • 4
  • 1
  • 3

6: An accumulator can be located between the

  • first stage and second stage compressors
  • compressor and condenser
  • evaporator and compressor
  • condenser and evaporator

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

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

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: Indirect systems using Group II refrigerants

  • shall be used for mechanical equipment only
  • shall be used in refrigeration system in excess of 1,000 lbs
  • shall have all refrigerant containing parts except piping, installed in a Class T machine room
  • shall be used in refrigeration system less than 1,000 lbs

10: An electronic bridge circuit is basically a

  • Wheatstone
  • high voltage circuit
  • 24 volt control circuit
  • suspension

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

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

12: When can 50/50 solder be used?

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

13: The difference between saturated liquid and saturated vapor is

  • pressure
  • heat
  • volume
  • temperature

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

15: How is bring measured?

  • hydrometer
  • manometer
  • anemometer
  • hygrometer

16: Which refrigerant is lighter than air?

  • R-717
  • R-11
  • R-123
  • R-134a

17: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1
  • 1.5
  • 1.2
  • 2.2

18: Relief valves are rated in

  • gallons of water per hour
  • pounds of air per minute
  • gallons of water per minute
  • pounds of air per hour

19: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

20: If a low-pressure chiller has a low-side leak, which of the following will most likely result?

  • High head pressure and low suction pressure
  • Low head pressure and high suction pressure
  • High suction pressure and high discharge pressure.
  • Low suction pressure and low discharge pressure

21: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 2.5, 3.0
  • 3.0, 3.5
  • 6.6, 6.6
  • 2.5, 2.5

22: Most CFC's are

  • toxic
  • inert
  • inert but toxic
  • flammable

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

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

24: Transformers are rated in

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

25: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct