Q1. (a) Draw the indicator diagrams of a 2-stroke main engine, showing each Step of the 2-stroke cycle (6)
(b) How is Power of a 2-stroke main engine with 6 units is calculated with the help of indicator diagrams (10)
Q2. With respect to 2-stroke and 4-stroke Diesel engines, describe
(a) What are the advantages and disadvantages of 2-stroke and 4-stroke engines? (8)
(b) Uses of each type of engine on board ship with reasons (8)
Q3. (a) Draw a sectional diagram of cylinder liner of 2-stroke diesel engine, marking each part. What is the material of cylinder liner? (8)
(b) How cooling of liner is achieved satisfactorily (4)
(c) What is cleaning ring and where it is fitted? (4)
Q4. (a) What is the function of connecting rod in a 2-stroke marine diesel engine? (4)
(b) Draw a diagrammatic sketch of connecting rod of 2-stroke engine. Name each component and describe its function. (8)
(c) Draw a diagrammatic sketch showing how lubricating oil is passed to crankpin bearing. (4)
Q5. (a) What is a composite boiler? Draw diagrammatic sketch of composite boiler and name each part. (8)
(b) What are the methods used to control the temperature in the steam drum? (6)
(c) What are the advantages of having composite boiler on the ship? (2)
Q6. (a) Explain fuel oil treatment process on board, before it is fit for use in main and auxiliary engines (8)
(b) What is the sign of incompatible fuel oil? What action is taken when incompatibility or not? (4)
(c) What is series purification of fuel oil, when it is required to be put in operation? (4)
Q7. (a) What lubricating oil test are carried out on auxiliary engine sump oil (4)
(b) What interference is drawn from each of the tests? (4)
(c) What action will be taken when abnormal results are obtained? (6)
(d) What is the frequency of on-board LO test? (2)
Q8. (a) Describe the function of Thrust bearing (4)
(b) Draw diagrammatic sketch of Thrust bearing and show the lubrication of each part (8)
(c) Describe the lubrication problems of thrust bearing (4)
Q9. With respect to medium speed diesel engines,
(a) Describe types of main bearing failure (8)
(b) Describe prevention of each type of failure (4)
(c) What are the reasons for crankpin bearing bolt failure? (4)
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