單項(xiàng)選擇題According to Regulations, a power driven auxiliary steering gear for a vessel capable of a 12 knot service speed, must be able to meet the rudder movement requirements at which of the minimum vessel speeds listed below?（）

A.6 knots
B.7 knots
C.9 knots
D.12 knots


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2.單項(xiàng)選擇題The follow-up gear on an electro-hydraulic steering gear（）

A.relieves excessive fluid pressure
B.takes the pump off stroke when the desired rudder angle is attained
C.synchronizes wheel position with the rudder position
D.returns the rudder to midposition when the wheel is released

3.單項(xiàng)選擇題When the helm demands a 20°right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?（）

A.The six-way valve opens
B.The steering service pump motor is stopped
C.The follow-up gear takes the pump off stroke
D.The cylinder relief valves bypass oil to the suction side the pump

4.單項(xiàng)選擇題In an electro-hydraulic steering gear, any change in relative position between the synchronous receiver and the follow-up gear will result in（）

A.the pump going to full stroke
B.closing of the six-way valve
C.driving the rams up against the stops
D.a corresponding slowing or increasing of the pumped flow rate

5.單項(xiàng)選擇題As the designated rudder angle is being achieved, as a result of the original command input, the steering gear follow-up mechanism is（）

A.in motion, providing a null input
B.not in motion, thus providing a null input
C.in motion, providing an input to place the main pump on maximum stroke
D.in motion, providing an input to place the main pump at null stroke