A.Suction head
B.Pump head
C.Discharge head
D.Total head
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A.toxic
B.flammable
C.explosive
D.all of the above
A.Fire pump and lube oil pump
B.Lube oil pump and distilling plant
C.Distilling plant and shaft alley door
D.Shaft alley door and fixed CO2 release
A.bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service
B.prevent excessive inter-stage pressure buildup
C.control compressor discharge pressure
D.remove all but the frictional load during starting
A.The relief valves in the system should be readjusted
B.The filters and strainers should be checked frequently
C.All system pressure should be readjusted
D.The system should be drained and renewed with a fluid of different operating characteristics
A.100℃
B.125℃
C.150℃
D.175℃
最新試題
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
Which of the following statements is correct concerning heat transfer?（）
When the steering gear is in operation, you should （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
A salinity indicator is used to determine the （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.