單項(xiàng)選擇題

Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.

A.pump bearings in poor condition
B.excessively worn actuator-piston packing
C.broken directional control valve centering springs
D.low hydraulic oil viscosity

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單項(xiàng)選擇題

Most solenoid valves are actuated by （）.

A.a spring
B.an electromagnet
C.the force of gravity
D.refrigerant pressure

單項(xiàng)選擇題

When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.

A.viscosity will decrease
B.volume will increase
C.volume will decrease
D.pour point will be reduced

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Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.

你可能感興趣的試題

Most solenoid valves are actuated by （）.

When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.