Q3. With reference to 2-Stroke Slow Speed Engine:
A. Sketch and describe Main Engine Exhaust Valve.
B. List out a procedure for test of Main Engine Exhaust Valve after overhaul.
Q6. What is "virtual tappet" in the hydraulically actuated air spring return exhaust valves, and how is it set. Explain why the damage occurs to the seats of the exhaust valves due to furrowing and cutting and how an incident of "valve drop" leading to extensive damage to running gear can occur.
Q4. A. State the circumstances owing to which it may be necessary to renew an exhaust valve. (5)
B. Explain how the exhaust valve is removed and fitted back. (6)
C. State the important checks to be made on the engine before after fitting the exhaust valve. (5)
Q9. (a) Explain why variable exhaust valve closing can be advantageous in the operation of large slow speed main engines.
(b) Explain, with the aid of a sketch, how variable exhaust valve closing is achieved.
(c) Explain how high impact is avoided as the valve closes. (2)
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