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【单选题】

The suction - force principle of operation is a typical characteristic of （）.

A、centrifugal pumps

B、jet pumps

C、propeller pumps

D、reciprocating pumps

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更多“The suction - force principle of operation is a typical characteristic of （）.”相关的问题
第1题
[单选题] The static suction head of is the （）

A、distance of the suction liquid level above the line of the pump  B、distance the suction liquid level is below the center line of the pump  C、force necessary to overcome frictional losses in the pump and piping  D、amount in inches of mercury the total suction head is below atmospheric pressure  

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第2题
[单选题] A positive displacement pump is that where the volume of the pump chamber is alternately increased to （） and then decreased to （）.

A、draw the liquid in；force the liquid out  B、force the liquid out；draw the liquid in  C、suction；draw  D、deliver；outlet  

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第3题
[单选题] A wedge of water building up between the bow and nearer bank which forces the bow out and away describes（）.

A、bank cushion  B、bank suction  C、combined effect  D、bend effect  

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第4题
[单选题] Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.

A、one size smaller than the pump suction nozzle  B、the same size as the pump suction nozzle  C、one size larger than the pump suction nozzle  D、installed with a short radius elbow at the pump  

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第5题
[单选题] The static suction lift of a pump is the difference in elevation between the （）.

A、centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump  B、centerline of the pump and the suction liquid level when the source of liquid is above the pump  C、centerline of the pump and the level of the discharge liquid  D、liquid levels of the suction and discharge  

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第6题
[单选题] Stability is determined principally by the location of the point of application of two forces: the downward-acting gravity force and the（）.

A、upward-acting weight force  B、downward-acting weight force  C、upward-acting buoyant force  D、environmental force  

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第7题
[单选题] The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）

A、one valve seats upwards, while the other seats downwards  B、the reed valves used on the discharge are made substantially thicker and heavier than the suction valves  C、the suction valve springs exert a greater tension than the discharge valve springs  D、the discharge valve springs exert a greater tension than the suction valve springs  

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第8题
[单选题] Reserve buoyancy is the（）.

A、unoccupied space below the waterline  B、volume of intact space above the waterline  C、excess of the buoyant force over the gravity force  D、difference in the buoyant force in salt and fresh waters  

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第9题
[单选题] The moment of a force is a measure of the（）.

A、turning effect of the force about a point  B、instantaneous value of the force  C、stability characteristics of the vessel  D、center of gravity location  

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