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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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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

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In order to make the gear of gear pump mesh smoothly, seal the suction oil chamber strictly and supply oil evenly and continuously, the overlap coefficient r of gear meshing must be made () 1.

A. greater than
B. equal to
C. less than

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There are three leakage ways in CB-B gear pump and _________ has the greatest impact on volumetric efficiency. ()

A. gear end clearance
B. gear tip clearance
C. gear base clearance
D. A + B + C

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The features of external gear pump include ().

A. the structure is compact and the flow rate is easy to adjust
B. the method of reducing the oil inlet is usually used to reduce the radial imbalance force
C. the noise is small, the oil delivery is uniform, the volume is small and the weight is light
D. low cost, reliable work, weak self-priming ability, mostly used in low-pressure system

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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 ().

In order to make the gear of gear pump mesh smoothly, seal the suction oil chamber strictly and supply oil evenly and continuously, the overlap coefficient r of gear meshing must be made () 1.

There are three leakage ways in CB-B gear pump and _________ has the greatest impact on volumetric efficiency. ()

The features of external gear pump include ().

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