单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

In a fixed displacement axial piston hydraulic motor, the speed is varied by（）

A.regulating the ratio between torque and speed via the torque limiter at the motor
B.directing the motor output flow through a bypass line
C.maintaining a constant flow and pressure input
D.controlling the input flow rate