Q3. 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.
B. State the significance of the roughness profile.
C. List the different sophisticated coatings which are available.
Q2. (a) Define the term Torsional Vibration with respect to an engine crankshaft, stating the effect that high levels can have on an engine crankshaft.
(b) Explain how engine deterioration influences the risk of Torsional Vibration, stating what can be done to minimise that risk.
(c) Explain possible reasons for the activation of a Torsional Vibration alarm after an engine has been started if there had been no previous history of such an alarm and if no maintenance had been undertaken on the engine whilst it was stopped.
Q7. A. Explain why centrifugal pumps cannot handle air or vapours to effect priming yet turbo- blowers operating on the same principle can.
B. If a vessel is fully laden, how may it be ascertained that the fire pump priming arrangements would operate satisfactorily in the ballast condition.
C. Explain a suitable method of priming suitable for a centrifugal pump.
Q6. State why the temperature of lubricating oil supplied to an engine needs close control. Sketch and describe an arrangement and explain the principle of operation of instrumentation and control equipment for automatically maintaining the temperature of lubricating oil supplied to an engine at its desired value
Q9. (a) Define proportional control action.
(b) Sketch and describe a simple pneumatic proportional controller.
(c) State a process where a proportional controller may be employed.
(d) State the disadvantage of proportional only action.
Q7. What are the major types of stainless steels used on merchant ships? Briefly explain each type. Which grades would you recommended for use in sea water environment? Why?
Q7. With respect to the refrigeration system on board vessels, answer the following
a) Why are some TEVs fitted with an external equalizing connection?
b) What is the purpose of a back pressure valve. what will the effect if it leaks?
c)How does an electronic TEV function.
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.
Q2.a) Define fatigue and fracture and specify the conditions under which it occurs.
b) Describe the different fracture modes and the mechanism of crack propagation in different fracture modes.
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