Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: R-22 is considered a(n)

  • HFC
  • HCFCH
  • CFC
  • HCFC

2: At higher altitudes, the boiling point of refrigerant is

  • equal to the coefficient of water at 32F
  • the same
  • lower
  • higher

3: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-1
  • B-2
  • B-1
  • A-2

4: Viscosity is

  • the coefficient of external friction
  • a measure of heat content
  • the ability of oil to flow
  • measure of weight

5: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Pressure Temperature
  • Isothermal
  • Volume Temperature
  • Adiabatic

6: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 10
  • 18
  • 15
  • 24

7: How is bring measured?

  • hydrometer
  • manometer
  • anemometer
  • hygrometer

8: Horizontal piping should be run level.

  • False
  • Yes, if the condenser is located above the evaporator
  • No, unless the supervisor on the job says so.
  • True

9: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 40% Li-Br, 60% tap water
  • 50% Li-Br, 50% tap water
  • 40% Li-Br, 60% distilled water
  • 60% Li-Br, 40% distilled water

10: Low pressure chiller systems use what type of compressor?

  • Scroll
  • Centrifugal
  • Reciprocating
  • Screw

11: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • trichlorotrifluoromethane
  • ammonia
  • methyl chloride
  • R-718

12: Can ammonia be used on domestic system?

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

13: By using nitrogen within a pipe during brazing operation,

  • The explosion hazard is confined
  • Exterior scale formation is minimized
  • Discoloration is prevented
  • Copper oxide formation is prevented

14: A chiller entering and leaving temperature difference is?

  • 20 degrees F
  • 50 degrees F
  • 10 degrees F
  • 5 degrees F

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

  • 2
  • 4
  • 1
  • 3

16: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices
  • do not need pressure relief protection
  • shall use fusible plugs

17: Adjusting the spring pressure on a TXV

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

18: A solder joint melts at temperatures of

  • less than 400F
  • 600F to 900F
  • 1,200F to 1,500F
  • 400F to 800F

19: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • high pressure
  • low pressure
  • critical pressure
  • design pressure

20: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices
  • shall use rupture discs or duel pressure relief valves
  • shall use fusible plugs

21: What is the state of the refrigerant leaving the evaporator?

  • a low temperature subcooled liquid
  • a high temperature superheated vapor
  • a high temperature subcooled liquid
  • low temperature superheated vapor

22: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 55 lbs
  • 500 lbs
  • 660 lbs
  • 330 lbs

23: In a horizontal shell & tube condenser, the ammonia is liquefied by

  • removing the latent heat of vaporization
  • water sprayed over condenser
  • removing the latent heat of fusion
  • passing thru the tubes from top to bottom

24: Can you use Ammonia in industrial applications?

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

25: What section of ASHRAE-15 governs pressure vessels?

  • Section 6 ASHRAE-34 ASME VIII unfired
  • Section 7 ASHRAE-15 ASME VIII fired
  • OSHA
  • Section 9 ASHRAE-15 ASME VIII unfired