Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Trichlorofluoromethane is the name of what refrigerant?

  • R-12
  • R-113
  • R-502
  • R-11

2: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • shall not be prohibited
  • shall be prohibited
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited
  • of Group B2 refrigerant shall be prohibited

3: 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

4: A run capacitor is wired in series with the _____ windings.

  • start capacitor
  • start
  • common
  • run

5: Megaohm meters can detect a ground in the

  • up to 10,000 ohms
  • 10,000,000 ohms or higher
  • up to 1,000 ohms
  • up to 1,000,000 ohms

6: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • over pressure protection and a rupture disc
  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection as well as a temperature protection device
  • over pressure protection

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

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

8: Which refrigerant replaced R-12?

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

9: The boiling point of a refrigerant is based on

  • Temperature
  • Heat content
  • a pressure-temperature relationship
  • None of the above.

10: What is the purpose of a surge capacitor on a contactor?

  • to balance the sine waves
  • to keep the contactor pulled in
  • to provide smoother start/stops
  • to protect low voltage equipment

11: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

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

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

13: R-22 falls under which safety classification?

  • A-2
  • B-1
  • A-1
  • B-2

14: Halogenated refrigerants cannot be used with what material?

  • Stainless steel
  • Aluminum
  • Magnesium alloy
  • Copper

15: On a TXV, the purpose of an external equalizer is to?

  • allow a greater adjustment spam
  • compensate for a pressure drop across the evaporator coil
  • balance the evaporator load
  • Increase the pressure on the top of the power head diaphragm

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

  • salt
  • sand
  • sugar
  • soil

17: Which is considered the more efficient condenser?

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

18: Gauge pressure is

  • Force of pressure above that of atmosphere
  • Barometric pressure
  • Absolute pressrue
  • Atmospheric pressure

19: On a large centrifugal system, what meters the flow to the evaporator?

  • Cap tube.
  • Low side float
  • TXV
  • High side float

20: R-12 is

  • dichlorofluoromethane
  • dichloromethane
  • trichlorofluoromethane
  • dichlorodifluoromethane

21: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

22: Each machinery room shall contain

  • 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
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate

23: How many different groups of refrigerants are there?

  • 15
  • 3
  • 7
  • 11

24: 746 watts is equal to

  • 1 hp
  • 100 hp
  • Pi
  • 10 hp

25: The 522 CMR 9.00 has adopted for reference ASHRAE ____

  • 10
  • 15
  • III
  • 25