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Q6: With reference to electro-hydraulic steering gears:

A. Sketch and describe a steering gear with two 50% torque units conforming to the single failure criteria. (8)

B. State, with reasons, the precautions necessary when operating on two rams only; (4)

C. Describe the tests necessary to ascertain that the gear will operate as required when one side of the circuit develops a malfunction. (4)

Q8.a) Sketch a two-ram type hydraulic steering gear with a single Electro-hydraulic pumping unit. Show the hunting gear arrangement and indicate valve positions. (8)

b) State the purpose of, and describe the operation of (8)

i) hydraulic shock/buffer valves.

ii) Oil replenishing tank.

iii) Hunting gear.

Q7. (a) Sketch in simple form a constant speed hele-shaw pump suitable for a hydraulic

steering gear. (6)

(b) Describe the pump and its principle of operation. (5)

(c) What characteristics of the pump make it suitable for use in steering gear system? (5)

Q4. With reference to electrohydraulic steering gear systems with four Rams,

(a) With the aid of a sketch describe the working principle of hydraulic pump. (8)

(b) Explain the method adopted to prevent hydraulic oil leakage along the rams (4)

(c) Discuss the methods adopted to prevent damage to the steering gear due to jumping of rudder in heavy seas. (4)

Q7. Sketch and describe how the torque is transmitted to the rudder stock in a rotary vane steering gear. (16)

Q6. With reference to electro-hydraulic steering gears:

A. Explain in terms of control parlance, the function of the “Hunting gear”;

B. Explain the consequences if the standby pumping unit is motored;

C. State TWO methods employed to prevent the standby hydraulic pump being motored by the operating unit.

Q1) With reference to rotary vane steering gears:

(a) Describe, with the aid of a sketch, how such a unit incorporates an integral rudder carrier (10)

(b) Explain how vertical rudder movement is accommodated (6)

Q4. With reference to hydraulic steering gears, sketch and describe each of the following: (A)Single failure concept;

(B)100 Percent redundancy.

Q7) (a) Sketch a four-ram steering gear arrangement capable of 100% redundancy. (8)

(b) Describe the operation of the arrangement sketched in (a). (8)

Q6. Sketch and describe a “fail safe steering gear” suitable for use on a tanker of more than 100,000 T dwt; Explain the sequence of events that take place when an oil leak takes place in one of the hydraulic pipe lines.

Q8. (a) List the SOLAS requirements for steering gear system of an ocean going ship. (10)

(b) Describe the drills and exercises mandated by the SOLAS convention with regards to the steering gear system with reference to the convention. (10)

Q4. A. Describe with the aid of sketches where necessary a vane type steering gear showing how to weight of the rudder and stock are carried and the arrangement that allow for wear down;

B. State how the vanes described in (A) are secured and the method of sealing the edges;

C. State how, if necessary, the steering gear is locked for rudder maintenance.