单项选择题

Rudder motion is prevented from exceeding the movement of the steering wheel by the（）

A.return springs
B.six-way valve
C.follow-up gear
D.differential gear

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单项选择题

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

单项选择题

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

单项选择题

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