The hand steering is a method by which the motion of the rud

While inspecting the steering system at sea, you should check for

A.air bubbles in the sight glass

B.any leaks in the system

C.over-travel in the rudder angle indicator

D.lost motion in the rams

How should you signal the crane operator to move slowly ________．

A.Use one hand to give any motion signal，and place the other hand motionless in front of the hand giving the motion signa

B.Extend arm with the thumb pointing up，and flex the fingers in and out for as long as the load movement is desired

C.First tap your elbow with one hand and then proceed to use regular signals

D.First tap the top of your head with your fist and then proceed to use regular signals

We use ________ when proceeding in dense fog

A.auto-steering

B.gyro-pilot

C.rudder gear

D.hand-steering

Which of the following statements is TRUE regarding crane operations ________．

A.Radio communications allow the crane operator to disregard the use of hand signals

B.The crane operators and signalman must be familiar with the correct hand signals

C.The forward cranes can be operated from the bridge

D.The aft cranes can be operated from the aft steering station

The “Port-Off-Stbd” selector switch on an autopilot steering stand is used to ______．

A.change from hand electric steering to automatic gyro

B.change over one steering system to the other

C.change over hand electric steering to non-follow-up

D.change over the port to the starboard bow thruster

When steering by hand，which of the following may be a functional input to the steering gear as a result of turning the wheel ________．

A.Non-follow-up

B.Rudder adjustment

C.Weather adjustment

D.All the above may be activated

When steering on autopilot which of the following input conditions may NOT have an effect on the control of the steering gear ________．

A.Non-follow-up

B.Rudder adjustment

C.Weather adjustment

D.All the above may be activated

The “Mode” selector switch on the autopilot steering stand is used to select any of the following with the EXCEPTION of ______.

A.automatic pilot steering

B.hand-electric steering

C.non-follow-up steering

D.rudder adjustment

When the helm is turned on the navigation bridge，which of the listed actions will be the FIRST response in the steering room on a ship equipped with an electro-hydraulic steering gear ________．

A.The pumps go to full stroke

B.The six-way valve aligns itself with the running pump

C.Both port and starboard cables are energized

D.The synchronous receiver turns，duplicating the helm motion

材料：

At 1800，the hydraulic steering system failed once again．The master realized he would require shore assistance to rectify the problem，and diverted towards Portland using the thruster to steer by．The weather at this time was south-south-west force 5．At about three hours later，the thruster drive unit failed due to a leaking fuel injector pipe on the power unit．This was replaced using the spare carried on board．Immediately following the engine restart，an adjacent fuel line failed causing shut down of the unit．With no fuel line spares available，the thruster power unit could not be used．The failure of this unit，and that of the main hydraulic steering system，left the vessel without any steering capability．

At 2155，with the weather deteriorating and no steering，the master contacted the Portland Coastguard and a“Pan pan”message was broadcast．A tow to Portland Harbor was arranged and she arrived alongside at 0240 the following morning．The subsequent investigation found that the main hydraulic steering system failure was due to a seized shuttle valve in the main hydraulic solenoid valve block．The solenoid valve had been recently overhauled．It was thought that the“O”rings fitted to the shuttle valve were of either the wrong type or a defective one．The valve had seized in such a position that hydraulic pressure by-passed the system preventing use of the hand steering．

问题：

The vessel was steered by thruster because ________ failed．

A.the hydraulic steering system

B.the solenoid valve

C.the thruster driving unit

D.the hand steering

The time that the thruster drive unit failed was ________ hrs．A.1800

B.2100

C.2155

D.0240

When the hydraulic steering system failed，________．A.the hand steering system could still be used

B.the auto steering system could still be used

C.both hand and auto steering system were out of use

D.neither and steering system nor auto steering system was out of use

The real reason that caused the hydraulic steering system to fail was that ________．A.no fuel line spare were available

B.the weather was deteriorating

C.the“O”rings fitted to the shuttle valve were of either the wrong type or a defective one

D.the thruster power unit failed

请帮忙给出每个问题的正确答案和分析，谢谢！