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Q7. 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 sketch variation of P(Max) with VIT position. (4)

Q2. (a) Draw sectional diagram of main engine piston showing each part. Show cooling passages for oil cooled piston (12)

(b) Name the different materials used for the various components of the piston as indicated to the answer above. (4)

Q6. 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 clearances. (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.

Q5. (a) What is a Exhaust Gas Economizer? Draw diagrammatic Sketch of Exhaust gas Economizer (EGE) naming each component (8)

(b) How is steam Generation controlled in Exhaust Gas Economizers? (4)

(c) Briefly describe procedure to maintain efficiency of such an E.G.E. (4)

Q6. If an auxiliary diesel generator over speeds while off load, explain:

(a) How can the engine be stopped? (6)

(b) What are the probable reasons for the failure? (4)

(c) Give details of the checks that are required to be made after the engine has been stopped, with regard to

(i) Mechanical checks and

(ii) Electrical checks (6)

Q2. (a) In a 4-Stroke engine, describe each of the four strokes of the engine. (6)

(b) Draw timing diagram of a complete cycle.

(c) How each stroke is completed, in the engine with action of crank travel and valves. (10)

Q8. (a) With a aid of a sketch briefly describe the important structural parts of 2-Stroke main Engine? How are different structural parts held together? (10)

(b) What is the function of Cross Head Guides? (6)

Q1. (a) Sketch and describe the Starting air system of main engine. (8)

(b) What are the safety interlocks provided in compressed air Starting system of Main Engine? (8)