DieselShip's Online Content Library

Q5. 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. (6)

B. State how the vanes described in (A) are secured and the method of sealing the edges. (5)

C. State how, if necessary, the steering gear is locked for rudder maintenance. (5)

Q4. With reference to a tubular heat exchanger, state the various types used on board a ship and explain with sketches how the construction, flow pattern, baffles, differ from each other depending upon the medium in use. (16)

Q5. Discuss the cause of corrosion and the means by which corrosion of the following may be limited by manufacturers and ship's personnel respectively:

A. Internal and External surfaces of auxiliary steam lines. (4)

B. External surfaces of auxiliary boilers. (4)

C. Water boxes of seawater coolers and condensers. (4)

D. Main Sea water inlet pipes. (4)

- - - PREVIOUSLY ASKED - - -

Q5. Discuss the means by which corrosion of the following may be limited by manufacturers and ship’s personnel respectively: (16)

A. Internal and External surfaces of auxiliary steam lines.

B. External surfaces of auxiliary boilers.

C. Water boxes of seawater coolers and condensers.

D. Main Sea water inlet lines.

Q6. With reference to hull cathodic protection systems of the impressed current type:

a) Sketch and describe such a system. (8)

b) Explain how protection may be ensured for the rudder and propeller. (4)

c) State any precautions that should be taken when this type of system is installed. (4)

Q6. a) Examine in detail three common but entirely different reasons for loss of steering gear systems. (5)

b) State how failure is inhibited in the design, operation and maintenance of steering gear systems. (5)

c) Describe how a vessel may make port upon irreparable failure of the steering telemotor. (6)

Q6. Hydrogen damage is a general term used for mechanical damage of metal caused by the presence of hydrogen, briefly discuss the different types of hydrogen damage and how these damages can be prevented? (4*4)

a) Hydrogen blistering

b) Hydrogen embrittlement

c) Decarburization

d) Hydrogen attack