题目内容

Which of the following statements is true? ( )

A. combination of stator with rotor is known as cartridge unit (泵芯)
B. combination of stator with vanes is known as cartridge unit(泵芯)
C. combination of rotor with vanes is known as cartridge unit(泵芯)
D. none of the above

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

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

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