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单选题
As for a hydraulic vane pump, which of the following is in contact with the vanes during working: （） (1)the rotor (2)the pump shaft (3)the external surface of the housing
A
(1) only
B
(2) only
C
(1) and (2)
D
(1),(2)and(3)
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（1）and（2）C
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In order for a fluid to be pumped, a fluid must be made to flowB
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excessive internal leakage in the pumpB
low discharge pressure and fluid flowC
excessive fluid level in the hydraulic reservoirD
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考题
单选题When a hydraulic vane pump is working, which of the following is in contact with the vanes?（） (1) the rotor (2) the internal surface of the housing (3) the external surface of the housingA
(1) onlyB
(2) onlyC
(1) and (2)D
(1), (2) and (3)
考题
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a low load on the unitB
a clogged pump suction strainerC
a blockage in the line between the pump and hydraulic motorD
the hydraulic motor turning too fast
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