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單項(xiàng)選擇題

Air trapped in the hydraulic fluid of a steering system may be indicated by（）

A.the steering pumps overspeeding
B.a jammed open relief vale
C.a constantly occurring improper rudder response
D.excessive ram pressure

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單項(xiàng)選擇題

The purging of air from an elector-hydraulic steering gear unit is necessary when（）

A.changing over to hand pump operation
B.engaging the trick wheel
C.the system has been filled with new oil
D.the rudder angle indicator does not match the helm position

單項(xiàng)選擇題

If a severe leak develops in the electro-hydraulic steering gear unit is necessary when（）

A.Loss of vessel steering
B.Overheating of the gyrocompass
C.Jamming of the six-way vale
D.Jamming of the follow-up device