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Q2. Sketch a high-lift safety-valve lid and seat detailing their special features. Describe how such a valve is overhauled and any clearance that should be measured and noted. (16)

Q9. With reference to auxiliary boiler safety valve: (16)

A. Describe, with aid of a Sketch the safety valves for an auxiliary boiler.

B. Identify, with reasons, the part that require particularly close attention during overhaul.

C. Describe how the safety valves are reset after an overhaul.

Q8. A. Explain the action of EACH of the following metallurgical mechanism:

(i) Creep;          (ii) Brinelling;   (iii) Fretting;     (iv) Fretting corrosion;

B .State, with reasons, where EACH of the mechanisms in occur in ship propulsion System.