题目内容

In which of these pumps, swash plate is replaced by cylinder block?

A. bent axis piston pump
B. radial piston pump
C. axial piston pump
D. none of these

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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

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

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