Q.

What prevents the leakage of oil inside an unbalanced vane pump?

A. vanes
B. cylindrical rotor
C. screw
D. difference between the pressure of inlet and outlet
Answer» A. vanes
Explanation: the vanes are seated in the radial slots of the rotor and held against the casing by spring force or hydraulic force. hence there will not be any leakage of oil between the vane tips and the casing. still, there is a little amount of leakage and hence the volumetric efficiency will be around 95%.
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