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单选题
Which of the listed pumps is NOT a positive displacement pump?（）
A
Centrifugal
B
Reciprocating
C
Gear
D
Rotary
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depending onB
in relative toC
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单选题A positive displacement pump is that where the volume of the pump chamber is alternately （） to draw the liquid in and then （） to force the liquid out.A
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decreased；decreasedD
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单选题Which of the following operating features do displacement pumps bear if they are working under no-cavitation condition?（） (1) output is almost directly proportional to speed (2) they are self-priming (3) they will develop a discharged pressure equal to the resistance to be overcome, irrespective of speedA
（1）and（2）B
（2）and（3）C
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（1），（2）and（3）
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单选题In the two stage flash distilling plant, which of the pumps listed is vented to the shell of the second stage in order to remove vapor from the pump suction?（）A
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changing the speed of the pumpC
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单选题Centrifugal pumps are non-positive and a fairly （） unit.A
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low dischargeC
low speedD
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单选题Which of the following types of hydraulic pumps would be used in a steering system?（）A
LobeB
ScrewC
Radial pistonD
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单选题When operating with a negative suction head, which of the following types of pumps will require priming?（）A
ReciprocatingB
CentrifugalC
RotaryD
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考题
单选题Centrifugal pumps are popular because they are very simple in construction,and produce smooth, constant, （） discharge.A
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单选题The amount of fluid delivered by a positive displacement pump can be regulated by （）.A
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changing the speed of the driving rotorC
either A or BD
None of the above is tree
考题
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