题目内容

In a bent-axis piston pump, what happens when the angle between the drive shaft and the cylinder block is varied?

A. piston displacement cannot be varied
B. variable flow rate can be achieved
C. fixed flow rate can be achieved
D. all the above

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更多问题

What is the maximum angle between the cylinder block and shaft axis of a bent-axis piston pump?

A. 30°
B. 50°
C. 45°
D. all the above

Which of the following statements are true?① piston pumps are self-priming.② piston pumps require high maintenance.③ piston pumps have low cost of production.④ piston pumps have low volumetric efficiency.

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

The most common methods to solve the problem of oil trapped or surrounded oil in gear pump are as follows: ().

A. reduces the speed
B. designs with unloading groove
C. increases the oil suction port
D. reduces the gas temperature

For a gear pump, if the output pressure is less than the rated pressure and is not zero, and the speed remains unchanged, the relationships of a. actual flow, b. theoretical flow and c. rated flow should be ().

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