Q1. a) What are the various types of corrosion that can occur in auxiliary boilers on ships? Describe each type, including its causes, symptoms, and potential consequences. (8)
b) Discuss the preventive measures and maintenance practices that can be implemented to mitigate corrosion and ensure the efficiency of the auxiliary boiler. (8)
Q2. Discuss the advantages and disadvantages of adopting the following policies for maintenance of main and auxiliary diesel engines.
A. Planned maintenance.
B. Condition monitoring.
C. Periodic replacement of components.
D. Break down maintenance (16)
Q3. Sketch and describe the arrangement of a main engine camshaft chain. Describe the repair procedure following fracture of one chain link during operation of the engine. Give possible reasons for the failure and explain how the chain is set initially at the correct degree of tension. (16)
Q4. A. Describe how a main engine fuel pump would be set and checked for:
(i) Timing (ii) Quantity (6)
B. Explain how a setting of a variable injection timing fuel pump is checked and adjusted. (5)
C. State why it be necessary to adjust the settings of a variable injection timed fuel pump. (5)
Q5. A. Describe the events leading to a crankcase explosion.
B. How is overheating indicated other than by a mist detector. (6)
C. How is severity of a crankcase explosion controlled. (5)
D. Discuss the action required when overheating is indicated. (5)
Q6. A. Sketch and describe a pneumatic control system for controlling temperature of main engine lubricating oil at outlet of the cooler (6)
B. Explain why air supplied to a pneumatic control system must be free from dust and water (4)
C. Describe how above impurities are removed (4)
D. State the possible consequences if the air supply is contaminated. (2)
Q7. a) Give reasons why cracks occasionally develop in large piston crown. State to what extent this cracking is considered of consequence. (8)
b) State how it is dealt with in the following instances - A. Fine hairline; B. Localised and shallow crack. (8)
Q8. Recent experience has shown persistence damage occurring on seating faces of main engine exhaust valve, which is not confined to any particular unit.
(a) State with reason the possible causes. (6)
(b) State the short-term action to be taken in order to minimize engine operational problem. (5)
(c) State with reason how future incident of this nature could be minimized. (5)
Q9. (a) If soon after joining as a second engineer on a motor vessel, you observed that number of holding down bolts are slack and fretting has occurred around slack holding down bolts. Describe what actions do you take. (8)
(b) Explain the correct procedure for checking the holding down bolts tightness? (8)
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