Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

2: How are refrigerant blends classified?

  • Blends don't have to be classified
  • Based on worst case fractionation
  • Based on best case Fractionation
  • Based on the oil used

3: The certificate of inspection

  • shall be posted and protected from dirt, water, and other elements
  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be authorized by a notarized insurance company
  • shall be posted on the compressor shell or electrical panel at the unit

4: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

5: Most CFC's are

  • inert
  • flammable
  • inert but toxic
  • toxic

6: A class B2 refrigerant is considered

  • toxic and non-flammable
  • non-toxic and non-flammable
  • non-toxic and highly flammable
  • toxic and somewhat flammable

7: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Moisture indicator
  • Muffler
  • Stop valve
  • Foot valve

8: Pressure is equivalent of

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

9: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

10: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

11: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

12: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

13: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 90%
  • 100%
  • 80%
  • 75%

14: A Low-Probability System

  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that a leak of refrigerant from a failed connection can not enter the occupied space

15: The two float-type metering devices are the

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

16: A relief valve discharge capacity is rated in

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

17: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the aggregate of the high side and low side
  • 2.5 times the design pressure
  • the low side
  • the high side

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

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

19: Before replacing a seized compressor, the _______ should be determinded.

  • designed head pressure
  • cause of seizure
  • current draw
  • type of refrigerant

20: Machinery rooms must be vented to ______?

  • neutralizing tank
  • outdoors
  • unoccupied spaces
  • basement

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

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

22: Which creates more of a heat load?

  • 90% RH
  • 70% RH
  • 30% RH
  • 50% RH

23: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 1/2"
  • 5/8"
  • 3/8"
  • 3/4"

24: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or more
  • vessels of 3 cubic feet or more
  • vessels of 3 cubic feet or less
  • vessels of 10 cubic feet or less

25: When can 50/50 solder be used?

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