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单选题
The pump discharge pressure will be considerably higher than the pressure at the （）.
A
pump entry branch
B
outlet pipe
C
impeller
D
None of the above is true
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low discharge pressure and fluid flowC
excessive fluid level in the hydraulic reservoirD
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单选题Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump?（） (1) Its discharge is continuous (2) It has no internal valves (3) Upon accidental closing of discharge valve, excessive pressure will not build upA
（1），（2）B
（2），（3）C
（1），（2），（3）D
（2）only
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单选题If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.A
capacity will increaseB
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单选题Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.A
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one size smaller than the pump discharge nozzleD
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booster pump failing to startC
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单选题To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the （）.A
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casing and impeller wearing ringsD
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mixed-flow pumpB
axial-flow pumpC
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All of the above are true
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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 downwardsB
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单选题When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）A
maintain higher than normal jacket water temperatureB
change the lube oil more frequently than normalC
maintain a higher air-box temperature than normalD
maintain a higher air-box pressure than normal
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