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Q9. a) With the help of simple diagram, explain Variable Injection Timing (VIT). (8)

b) Explain with suitable diagram, start and end of VIT points. (4)

c) Explain with graph variation of P(Max) with VIT position. (4)

Q2. a) Draw sectional diagram of main engine piston showing each part. (8)

b) Show cooling passages for oil cooled piston. (4)

c) What is material of crown and other parts of piston. (4)

Q3. a) What is the importance of measuring bearing clearance in a diesel engine. (4)

b) What is Bridge gauge? Describe its usage with diagram. (6)

c) What are the other recommended methods used onboard to check bearing clearance. (6)

Q1. Describe following terms with respect to Diesel Engine with suitable diagram. (16)

a) Piston Stroke

b) Swept Volume

c) Clearance volume

d) Compression ratio.

Q4. i) What is a Exhaust Gas Economizer? Draw diagrammatic Sketch of Exhaust Gas Economizer naming each component. (8)

ii) How steam Generation is controlled in Exhaust Gas Economizers. (4)

iii) How to maintain efficiency of a Exhaust Gas Economizer. (4)

Q9. If an auxiliary diesel generator over speeds and runs away while off load, explain:

a) How it can be stopped? (6)

b) What is likely to be the reasons for the failure? (4)

c) Give details of what checks are made after the engine has been stopped, both regard to (6)

i) Mechanical checks and

ii) Electrical checks

Q6. a) In a 4-Stroke engine, describe each of the four strokes of the engine. (5)

b) Draw timing diagram of complete cycle (5)

c) How each stroke is completed, in the engine with action of crank travel and valves. (6)

Q7.a) What are the structural parts of 2-stroke main Engine? (6)

b) How are different structural parts held together? (4)

c) What is the function of Cross Head Guides.

(4)

Q1. a) What are the safety interlocks provided in compressed air starting system of Main Engine? (8)

b) Sketch and describe the air starting system of Main Engine. (8)