Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Total heat of a substance is considered

  • empathetical
  • sensible heat
  • specific heat
  • enthalpy

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

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

3: When should a relief valve start to function?

  • Two times it's working pressure
  • At it's set pressure
  • Before the purge station discharges
  • 10 psi before it's set pressure

4: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • refractometer
  • anemometer
  • hydrometer
  • Psychrometer

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

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

6: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Certified
  • Insulated and installed in a pipe duct (Encased)
  • Classifed
  • Leak checked

7: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b

8: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

9: How many refrigerant classifications are there for toxicity?

  • 5
  • 3
  • 2
  • 1

10: What is the leaving chilled water set point for water chiller systems?

  • 38F
  • 66F
  • 55F
  • 45F

11: What section governs pressure vessels?

  • Section 8 ASHREA 15 ASME unfired
  • Section 1 ASHREA 15 ASME fired
  • Section ASHREA 34
  • OSHA

12: Which refrigerant replaced R-12?

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

13: What is the refrigerant dichlorodifluoromethane?

  • R-134A
  • R-22
  • R-12
  • R-123

14: Class T machine room

  • has no flame producing apparatus permanently installed
  • shall include closets used for setting equipment
  • shall have remote controls to stop the action of the refrigerant compressor
  • shall have refrigerant leak detecting systems installed inside and outside the room

15: Stop valves shall not be permitted between the system and the

  • relief valve
  • bleed valve
  • service valve
  • condenser

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

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

17: How would you know if there was a loss of crankcase pressure?

  • oil will thin out
  • oil will thicken
  • oil will foam
  • oil level will rise

18: Liquid line filter-driers on a 410A system must be rated for no less than

  • 400 psig
  • 600 psig
  • 200 psig
  • 1000 psig

19: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • mixed occupancy
  • institutional occupancy
  • commercial occupancy
  • public assembly occupancy

20: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

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

22: Single compound Refrigerants are classified by what two criteria?

  • Weight and color
  • Temperature range and hazardousness
  • Flammability and temperature range
  • Flammability and toxicity

23: What kind of material can't be used on the outlet of a relief valve?

  • PVC
  • Aluminum
  • Stainless Steel
  • Copper

24: What does an anemometer measure?

  • velocity
  • temperature
  • amperage
  • voltage

25: What type of material can't be used on the outlet of a relief valve?

  • Stainless steel
  • PVC
  • Magnesium alloy
  • Copper