A.excessive drive motor speed
B.excessive pump discharge pressure
C.too low of a tilting box angle
D.insufficient drive motor speed
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A.high pressure liquid
B.low pressure vapor
C.high pressure vapor
D.low pressure liquid
A.propeller hub
B.lignum vitae
C.shaft packing
D.labyrinth seal
A.liquid
B.dry saturated gas
C.wet saturated gas
D.superheated vapor
A.closed, and no leakage permitted across the shaft packing
B.closed, and only slight leakage permitted across the shaft packing
C.open, and no leakage permitted across the shaft packing
D.open, and only slight leakage permitted across the shaft packing
A.freezing point
B.floc point
C.condensing temperature
D.compression temperature
最新試題
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
When the steering gear is in operation, you should （）.
A pressure drop through the refrigerant liquid line may cause （）.
Which of the listed pumps is NOT a positive displacement pump?（）
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.