DieselShip's Online Content Library

Q1. a) Define creep and specify the conditions under which it occurs? (8)

b) Discuss three metallurgical processing techniques that are employed to enhance the creep resistance of metal alloys (8)

Q2. You have been appointed as second engineer on a crude carrier, recently purchased by your shipping company. The company superintendent requests that you examine the vessel with a view to increasing its deadweight capacity without altering the ship’s length. Outline the suggestions that you would make, justifying your proposals.(16)

Q3. 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 sleeved keyless propellers:

(a) State with reasons why the following practise are not advisable when removing the propeller from its shaft. (8)

i) Expansion of boss by intense concentrated heating by blow torch.

ii) The use of wedge or jacks.

(b) Describe a system that is used to remove the propeller from its shaft. (8)

Q5. As second engineer onboard a tanker, describe the preparation and procedure for presenting a Main Boiler for survey by a classification society by the shipboard staff? (16)

Q6. A. Describe the preparation necessary before the application (in dry dock) of sophisticated or approved long life coating to the underwater surface of the hull. (6)

B. State the significance of the roughness profile. (5)

C. List the different sophisticated coatings which are available. (5)

Q7. a) Explain with a sketch the operation of an automatic expansion valve as fitted in the direct expansion refrigeration plants. How is this valve adjusted? (6)

b) Explain how critical temperature restricts plant operation and how these limitations can be overcome? (5)

c) Explain how this system maintains the provision rooms at different temperatures? (5)

Q8. a) Explain why pilot injection is required for a Dual fuel engine when burning natural gas. (8)

b) Describe, with the aid of a sketch, the arrangements for a dual fuel engine which is capable of burning natural gas on

a) The Otto cycle.

b) The Diesel cycle. (8)

Q9. Describe with a sketch a pneumatic relay and show how feedback can be achieved when such a relay is used in conjunction with a flapper mechanism. (16)