Why do acetylene cylinders contain acetone?
A) Acetone helps keep the cylinder weight balanced by evenly distributing the liquid.
B) Acetone chemically reacts with the filler in the tank to produce acetylene gas.
C) Acetylene gas is dissolved in the acetone liquid.
D) The acetone liquid boils off to form acetylene gas.
[Ques. 2] Along with the refrigerant that is being discharged, compressors will discharge which of the following as it leaves the compressor?
A) Carbon dioxide B) Oil C) Vapor D) Water
[Ques. 3] A hygroscopic lubricant:
A) Absorbs water readily. B) Is used primarily with water-cooled systems.
C) Is an oil whose composition is based on water. D) Is water repellant.
[Ques. 4] Why are acetylene cylinders only used in the upright position?
A) To take advantage of natural convection
B) The acetylene cylinders will roll around if they are laid sideways on the floor.
C) The upright position is more convenient because they take up less space.
D) To prevent acetone from being pulled out of the cylinder
[Ques. 5] To increase the evaporator pressure, the adjustment on top of an automatic expansion valve should be:
A) Turned clockwise. B) Turned off.
C) Turned on. D) Turned counterclockwise.
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