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Q3. Describe following terms with respect to Diesel Engine with suitable diagram:
(a) Natural aspiration (4)

(b) Scavenging (4)

(c) Supercharging (4)

(d) Types of Super charging in two stroke engine. (4)

Q5.a) State why double walled fuel pipes are employed for high pressure fuel lines. (6)

b) Sketch and describe such a double walled pipe arrangement and show how high-pressure pipe failure is indicated. (10)

Q3. i) How power is calculated from indicator diagram. (6)

ii) How does Indicator diagram show early fuel injection? What are bad effects of too early injection? (5)

iii) What are indications of late injection on indicator diagram of the unit? What are bad effects of late injection of fuel on the units? (5)

Q4. With reference to a turbo-charging system of an engine:

a) State the parameters that you would check while taking over the watch. (8)

b) Action to be taken in the event of turbo-charger is observed to vibrate abnormally. (8)

Q5. Discuss the consequences of failure to maintain correct clearances in the case of auxiliary diesel engine crankshaft and bottom end bearing. Describe the procedure of taking crankshaft deflection (16)

Q9. a) Describe how fuel injector components deteriorate with time? (6)

b) What are effects of deterioration of fuel injector components? (6)

c) What are the signs of a bad injector? (4)

Q7. With respect to a marine diesel engine:

a) What are the different types of lubrication system that you would see on the main and auxiliary machineries? (8)

b) What are the desirable qualities for the lubricating oil selected for each of the following duties: (8)

i) Auxiliary diesel engine

ii) Stern tube bearings

iii) Refrigeration system

iv) turbocharger

Q8. With reference to cylinder liner wear in large slow speed engine.

a) State THREE major factors associated with wear. (4)

b) Explain the procedure for correct ‘running in’ of piston rings and cylinder liners. (4)

c) Explain what is achieved by ‘running in’ process. (4)

d) Describe how cylinder lubrication limits wear. (4)

Q2. Describe the action you as watch keeper would take and outline possible reasons for failure in both the following cases:

a) The auxiliary diesel engine fails to turn on starting air. (8)

b) The engine turn on starting air but fails to fire. (8)