题目内容

In the case of no leakage, the flow calculated from the pump is called ().

A. actual flow
B. theoretical flow
C. rated flow

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In practice, when the pump pressure is zero,the flow rate of itis often regarded as ().

A. actual flow
B. theoretical flow
C. rated flow
D. leakage flow

The input power to hydraulic pump should be greater than the output power of the hydraulic pump, because of ().

A. leakage loss;
B. friction loss;
C. overflow loss;
D. both leakge loss and friction loss

Which type of hydraulic pump can be used as a variable displacement pump? ()

A. gear pump
B. single acting vane pump
C. double acting vane pump
D. B + C

Variable displacement pumps used in hydraulic applications can1. have variable flow rate2. consume less energy3. be operated with high accuracy for slow and rapid motion 4. generate more heat

A. 1 and 2
B. 3 and 4
C. 1, 2 and 3
D. all the above