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单选题
A reciprocating pump belongs to （） according to its working principle.
A
injector pumps
B
positive displacement pumps
C
centrifugal pump
D
centripetal pumps
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closedB
opened fullyC
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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
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单选题Increasing the speed of a centrifugal pump will result in an increase in its capacity in its capacityAnother means of increasing the capacity pump is to increase the（）A
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diameter of the suction piping, with all other factors remaining the sameC
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单选题A mixed-flow pump is a （） pump classified by the working principle.A
self primingB
positive displacementC
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impeller
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单选题（）belongs to emergency power supplying equipments.A
Emergency fire pumpB
WindlassC
Main sea water pumpD
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leaky pipeB
opened inlet valveC
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improper gravity discC
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centrifugal pump is cheaper than reciprocating pumpB
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考题
单选题A vane pump belongs to （） according to its working principle.A
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positive displacement pumpC
centrifugal pumpD
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