Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: How far from the ground does a relief valve need to be?

  • Not more than 3' above grade
  • At least 20' above grade
  • At least 15' above grade
  • At least 25' above grade

2: Lithium-bromide, Li-Br, is best characterized as a

  • sand
  • soil
  • salt
  • sugar

3: 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

4: What do you need to do when you install a new system?

  • Add refrigerant
  • Insulate the suction line before you take a superheat reading
  • Document the superheat and subcooling reading
  • Have it inspected

5: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • outside the room, immediately adjacent to each door
  • inside the room, immediately adjacent to each door
  • on a conspicuous card located near the evaporator
  • on a conspicuous card located near the compressor

6: Control systems can be classified by

  • source of power
  • economy of operation
  • tonnage of system
  • safety

7: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • 2.5 times the design pressure
  • the aggregate of the high side and low side
  • the low side
  • the high side

8: R-22 falls under which safety classification?

  • B-2
  • B-1
  • A-2
  • A-1

9: What is the minimum height refrigeration piping should be placed against walls?

  • 72"
  • 7.25'
  • 6'
  • Ceiling height

10: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • specific heat
  • sensible heat
  • lost heat
  • latent heat

11: The absorber shell contains the

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

12: What does safe access mean?

  • A clear unobstructed path to the equipment and controls
  • OSHA approved
  • Locked doors
  • Well-lit exit signs

13: A High-Probablity system

  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that a leak of refrigerant from failed connections will enter the occupied space
  • is a system highly likely to leak from a failed connection or component of such system
  • is such that any leak will cause injury or death to anyone within a 100 square foot area

14: The purpose of an accumulator is to

  • assure no liquid returns to the compressor
  • reduce friction loss to the flow of refrigerant
  • store excess refrigerant from the reciver
  • filter out impurities from the system

15: 1 Watt = ______ BTU's?

  • 12
  • 4.482
  • 7.216
  • 3.412

16: Each machinery room shall contain

  • a refrigerant detector located in an area where the refrigerant 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
  • high and low pressure controls
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate

17: 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 its white
  • When it's used as part of a supply or return air system
  • When there are sprinklers above

18: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 66
  • 50
  • 25
  • 22

19: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 1,000
  • 100,000
  • 100
  • 10,000

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

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

21: A mercury bulb controller is not recommended for

  • line or low voltage use
  • line voltage use
  • low voltage use
  • use where vibration is severe

22: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • non-volumetric displacement compressor
  • neutral chamber-type compressor
  • non-positive displacement compressor
  • negative displacement compressor

23: Watt's Law indicates Volts X Amps = _________.

  • Resistance
  • Watts
  • Ohms
  • Current

24: If air is present in an absorption chilled water appliance, which of the following will most likely occur?

  • The Li-Br solution will become more diluted
  • The Li-Br solution will become more concentrated
  • Rust can form
  • System operating pressure will drop

25: How many BTU's is produced by one watt of energy

  • 2.57
  • 1
  • 3.41
  • 3.00