Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

2: A professional or office building would be considered what type of occupancy?

  • business
  • mercantile
  • commercial
  • public assembly

3: Transformers are rated in

  • volts-ohms
  • volt-amps
  • volts
  • amps

4: 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

5: If the power element on an expansion valve should lose its charge, the valve would

  • Under feed
  • Stay open
  • Over feed
  • Close

6: Which refrigerant is lighter than air?

  • R-717
  • R-11
  • R-123
  • R-134a

7: The leaving chilled water set point for comfort cooling is typically?

  • 60
  • 66
  • 45
  • 38

8: What is the refrigerant dichlorodifluoromethane?

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

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

  • R-718
  • ammonia
  • methyl chloride
  • trichlorotrifluoromethane

10: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • decreases
  • doesn't change
  • run as designed with low ambient controls
  • increases

11: Ammonia (NH3) is a group III refrigerant

  • True
  • False

12: 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

13: Can you use Ammonia in industrial applications?

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

14: Which is considered the more efficient condenser?

  • spray cooled
  • air cooled
  • water cooled
  • fan cooled

15: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

16: What is potential measured in?

  • Ohms
  • Henrys
  • Volts
  • Amps

17: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 33
  • 50
  • 18
  • 22

18: On a single phase motor, when does the start winding cut out?

  • 50% of its RLA speed
  • 25% of its RLA speed
  • 100% of its RLA speed
  • 75% of its RLA speed

19: Ammonia belongs to Group

  • A-1
  • B-2
  • B-1
  • A-2

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

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

21: Each machinery room shall contain

  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate
  • high and low pressure controls
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements

22: If a purge unit fails on a low pressure chiller, what are the symptoms?

  • low pressure chillers do not have purge units
  • increased capacity
  • low suction pressure
  • high head pressure

23: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

  • lower
  • there is no Group B1 refrigerants
  • higher
  • the same

24: What is an egress?

  • An entrance or exit
  • An escape route
  • A valve put on the low side of the system to prevent frosting
  • A code violation

25: How many different groups of refrigerants are there?

  • 3
  • 15
  • 7
  • 11