Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which oil is hydoscopic?

  • animal
  • mineral
  • SW30
  • polyolester

2: Which refrigerant class listed below is the most flammable?

  • A3
  • B2
  • A2
  • C3

3: Mercury was used in thermometers primarily because it

  • was inexpensive
  • never freezes
  • vaporizes at very high temperatures
  • expands uniformly

4: Machinery rooms must be vented to ______?

  • basement
  • neutralizing tank
  • unoccupied spaces
  • outdoors

5: What measures gas pressure?

  • Hydrometer
  • Manometer
  • Barometer
  • Hygrometer

6: How many flammability classifications are refrigerants in?

  • 7
  • 2
  • 3
  • 5

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

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

8: 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

9: How much clearance do you need around the perimeter of electrical panels?

  • 24"
  • 12"
  • 36"
  • 18"

10: What refrigerant were phased out in 2004?

  • R-22
  • R-12
  • R-134a
  • R-11

11: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

12: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will stop cooling and the solution will evaporate.
  • The machine will cool excessively as the solution evaporates
  • The machine will cool excessively as the solution crystallizes.
  • The machine will stop cooling and solution will crystallize

13: Sensible heat is the heat added to a substance to

  • cause evaporation
  • raise its temperature
  • change its state
  • freeze it

14: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 25%
  • 4%
  • 1%
  • 2%

15: What is a megaohm meter?

  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested

16: In a system designed for sub-zero ambient temperatures, what must be added?

  • Infrared dye for leak identification
  • Nitrogen
  • Booster compressor
  • Low-ambient kit

17: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 99%
  • 75%
  • 90%
  • 80%

18: A direct system

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

19: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

20: Which refrigerant replaced R-12?

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

21: Give an example of a secondary coolant?

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

22: Heat transferred by conduction from one body to another is done

  • via solids
  • via liquids
  • via radiation
  • via heat rays

23: Evaporators within 18" of a heating coil must be equipped with a

  • pressure relief device
  • low limit control
  • zone valve
  • high limit control

24: The absorber shell contains the

  • condenser and the generator
  • condenser and the absorber
  • condenser, the evaporator, and the generator
  • evaporator and the absorber

25: Which of the following is not an air velocity meter?

  • Anemometer
  • Hydrometer
  • Anemotherm
  • Velometer