單項(xiàng)選擇題The hydraulic oil most likely to thin out when hot and thick when cold would have a viscosity index of()

A.20
B.40
C.60
D.80


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1.單項(xiàng)選擇題When the steering wheel is turned, oil is directed to the steering gear rams by()

A.modulating the oil flow with the six-way valve
B.moving the automatic pressure differential valve
C.moving the receiving telemotor which regulates the tow-way valve
D.varying the eccentricity of a floating ting or angle of a tilting box

2.單項(xiàng)選擇題Rudder position is shown on the bridge by the()

A.rudder angle indicator
B.follow-up gear
C.telemotor position
D.relief valves

3.單項(xiàng)選擇題In an elector-hydraulic steering system, rudder shock is limited by()

A.a differential gear
B.return springs
C.a hydraulic accumulator
D.relief valves

4.單項(xiàng)選擇題Most hydraulic steering gears are fitted with relief valves which()

A.function when the rudder is amidships
B.relieve excess whip pressure from the hydraulic oil system
C.protect the piping assembly from external rudder shock
D.relieve excessive telemotor pressure

5.單項(xiàng)選擇題On an electro-hydraulic steering gear, which of the listed devices will keep the rudder from over-traveling the bridge signal?()

A.Rudder angle indicator
B.Follow-up gear
C.Electric transmitter
D.Rudder angle limit switch

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