单项选择题
Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）
A.Proper refrigerant charge
B.Faulty expansion valve
C.Insufficient refrigerant
D.Solenoid valve stuck open
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相关考题
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单项选择题
Moisture in a refrigeration system can cause （）.
A.freezing the expansion valve closed
B.corrosion of system piping
C.improper temperature regulation
D.all of the above -
单项选择题
When the propeller blades are integral with the hub, the propeller is called a （）.
A.built up propeller
B.solid propeller
C.controllable pitch propeller
D.suction back propeller -
单项选择题
The tendency of a flammable liquid to vaporize is indicated by its （）.
A.ignition temperature
B.flash point
C.flammable range
D.convection index
