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Q8. Sketch a cross section through a piston rod stuffing box; A. Define with detail sketches the function of and difference between, sealing rings and scraper rings; B. Identify with reasons those details which should receive particular attention during overhaul of the complete assembly.

Q2. With reference to behaviour of fabricated bed plates and frames in services:

A. Identify various forces imposed simultaneously upon them;

B. Explain how engine structure withstands these forces;

C. State how these forces are transferred to ship’s structure

Q9. Explain the modern methods of turbo charging available such as A. Pulse converter system; B. Sequential turbo charging; C. Two stage turbo charging; D. Variable geometry turbochargers.

Q4. With respect to carriage of LNG as bunker on board ship & subsequent consumption of the fuel in the diesel engine, discuss: (16)

a) Types of bunker tank arrangement

b) Liquefied gaseous fuel containment safeties

c) Bunkering Requirements

Q2. During a routine crankcase inspection a main engine top end bearing is found to be wiped and subsequent inspection shows that the pin is badly scored.

A. Explain in detail the action which should be taken to enable the engine to be safety operated so that the vessel may reach a port where effective repair facilities are available.

B. State with reasons the factors which influence the speed at which the engine may be safely operated.

Q6. a) Sketch and describe a flywheel that would be fitted to a large marine diesel engine. (8)

b) Explain the role of the flywheel during engine starting and stopping operations, including its function in providing momentum for initial engine rotation. (4)

c) Discuss the recent advancements in flywheel technology for main engines, such as light-weight materials, enhanced designs, or integrated monitoring systems. (4)

Q3. A. Compare the advantages of forged and built-up crankshafts with special reference to the magnitude of the stresses in the cranks; B. How would you check the deflections by means of a dial gauge through one revolution of the shaft? C. How are the readings obtained interpreted?  D. How wear is down measured?

Q1. Describe the procedure in lining up an engine bedplate, main bearings, gear box, thrust block, propeller shafting and tail-end shaft, assuming this to be a new ship.

Q9. Describe the developments that have taken place in the design of bearings of slow speed marine diesel engines, focusing on the reasons for such changes. (16)