题目内容

The displacement of hydraulic pump or motor depends on ().

A. fow rate change;
B. pressure change;
C. speed change;
D. structure size.

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The commonly used pressure of the pump includes: a. the output pressure of the pump; b. maximum pressure of pump; c. rated pressure of pump. The relationship of the above three pressures should be ().

A. b>a>c
B. b>c>a
C. a>c>b
D. c>a>b

The flow rate of pump at rated speed and rated pressure is called ().

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

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

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

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