單項選擇題Rotation of the steering wheel on the navigation bridge initiates oil pressure being applied to the steering gear rams by （）.

A.regulating the oil flow with the six-way valve
B.moving the automatic differential valve
C.moving the receiving tele-motor which regulates the two-way valve
D.varying the angle of a tilting box or eccentricity of a floating ring


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2.單項選擇題When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is （）.

A.set for maximum torque
B.on the purge and vent stroke
C.in the neutral position
D.rotating backwards

3.單項選擇題The structural members of the hull extending in a fore and aft direction are called （）.

A.frames
B.joiners
C.longitudinals
D.knees

4.單項選擇題Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.

A.pump bearings in poor condition
B.excessively worn actuator-piston packing
C.broken directional control valve centering springs
D.low hydraulic oil viscosity

5.單項選擇題Most solenoid valves are actuated by （）.

A.a spring
B.an electromagnet
C.the force of gravity
D.refrigerant pressure