DieselShip's Online Content Library

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)

Q2. a) With reference to crankshafts and piston crowns outline the main stresses to which these parts are subjected. (4)

b) In each case explain how the stresses are generated and how they very in magnitude and direction during one cycle. (6)

c) With respect to the whole engine, describe how stresses may be accommodated by good design and influenced by poor maintenance. (6)

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 auxiliary engine fuel pumps

a) Explain how a fuel pump may be checked for accuracy of injection timing. (6)

b) Describe how fuel pump may be adjusted after overhaul. (5)

c) Explain the circumstances in which it is considered necessary to replace a fuel pump. (5)

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)

Q6. a) How is 2- stroke engine started? Describe the sequence of engine starting step. (5)

b) Draw the Timing diagram of engine starting, showing crank position of each. (6)

c) What is OVERLAP in engine starting (5)

Q7. with respect to modern 2-stroke Diesel Engine.

a) What is Electronically controlled engine? Which all functions of main engine are controlled electronically. (8)

b) Discuss how these types of engines are superior to their earlier designs. (6)

c) Name at least 2 makers of Electronically controlled engines and their types. (2)

Q8. a) Draw sectional diagram of exhaust valve of 2-stroke Diesel Engine. Name the different components of the valve. (8)

b) Describe working of the valve in operation. How valve rotation occurs during operation and its purpose. (6)

c) What is the special material used on valve lid. (2)

Q9.a) What are the difficulties observed in lubrication of gear teeth in gear trains? (4)

b) Describe with diagram, how good lubrication to gear teeth is achieved? (6)

c) What are the qualities of lubricating oil suitable for main Reduction Gearing of main engine? (6)