Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • strong solution
  • weak solution
  • diluted solution
  • absorbed solution

2: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

3: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When there is a space 6' or more above it
  • When there are sprinklers above
  • When its white
  • When it's used as part of a supply or return air system

4: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

5: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

6: Ammonia belongs to Group

  • A-1
  • B-2
  • B-1
  • A-2

7: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

8: 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

9: The outer portion of shell of the compressor used on low-pressure chillers is called the

  • suction
  • nozzle
  • volute
  • baffle

10: The formula for Pure Power in a resistance circuit is

  • Watts X power factor
  • Watts X amps.
  • Watts = volts X amps
  • Kw = volts X amps

11: What is the minimum size wire you can use on a 30 amp circuit?

  • 10 AWG
  • 12 AWG
  • 16 AWG
  • 14 AWG

12: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 100
  • 24
  • 75
  • 50

13: 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

14: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.

  • 400
  • 350
  • 100
  • 250

15: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

16: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 200
  • 12,000
  • 720,000

17: Doors communicating with outside from a mechanical room must be?

  • Steel, approved, weather-stripped
  • Self-closing, aligned, fire door
  • Self-closing, wooden, fire door
  • Self-closing, approved, fire door

18: Sublimation occurs when

  • ice melts and turns to water
  • gas is formed directly from a solid
  • liquid is formed from a gas
  • gas is formed from a liquid

19: The Department that certifies the transportation of refrigerant is the

  • RSES
  • EPO
  • DOT
  • EPA

20: Machinery rooms must be vented to ______?

  • outdoors
  • neutralizing tank
  • unoccupied spaces
  • basement

21: The two float-type metering devices are the

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

22: Halogen refrigerants are corrosive to which type of metal?

  • stainless steel
  • magnesium
  • copper
  • black iron

23: Low ambient controls are used when

  • always
  • on air conditioning systems only
  • when systems run all year round
  • economizers are used

24: The two basic types of evaporators are

  • direct expansion and plate
  • finned and plate
  • prime surface and finned
  • flooded and direct expansion

25: When a refrigeration or air conditioning system is installed

  • it shall not be operated below prescribed pressures
  • the form of certificate shall be authorized by the Department of Pubic safety
  • it shall be approved by the owner for proper operation.
  • a field inspection shall be made before it is put into service