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Q1. Express your reactions and state the subsequent investigation you would make if a laboratory report on a used diesel engine oil sample indicated the presence of appreciable amounts of: (16)

A. Iron

B. Copper, Antimony and Tin

C. Silicon.

Q2. a) During an inspection it is noticed that tie rods of certain main engine units have become slack, state with reasons the possible causes of this. (5)

b) Explain how correct tension is restored and the risk of future slackness minimized. (5)

c) A tie rod has fractured and cannot be replaced immediately, State with reasons the course of action to be adopted in order to allow the engine to be operated without further damage. (6)

Q3. With reference to fixed CO2 system for fighting machinery space fires:

a) Sketch a CO2 bottled system.

b) How the number of CO2 bottles required for ship is calculated?

c) Explain how the system sketched in part (a) is protected from overpressure.

d) Describe the periodic maintenance required. (16)

Q4. A. State the circumstances owing to which it may be necessary to renew an exhaust valve. (5)

B. Explain how the exhaust valve is removed and fitted back. (6)

C. State the important checks to be made on the engine before after fitting the exhaust valve. (5)

Q5. A. Describe THREE different patterns of tube used in exhaust gas boilers. (4)

B. Give reasons why a tube is condemned. (4)

C. Describe how it is replaced by a spare tube. (4)

D. Suggest with reasons the possible consequences of allowing an exhaust gas boiler to run dry during full power operation of the main engine. (4)

Q6. a) Sketch an outboard type of oil seal suitable for oil filled stern tube indicating the principal component. (5)

b) Explain how the seal compensated for wear of the seal face maintains oil tightness. (4)

c) What is the effect of seawater contamination of stern tube oil and how contamination risk can be reduced? (3)

d) State the physical properties required for the bearing material in oil filled stern tube. (4)

Q7. For a fully automatic provisions refrigeration system incorporating a number of rooms.

A. Explain how each room temperature is set. (4)

B. Describe the sequence of events following a demand for increased refrigerant flow from one room. (4)

C. State with reasons the devices incorporated into the system to protect the machinery and equipment against malfunction. (4)

D. State how satisfactory operation of the plant can be established? (4)

Q8. As a second engineer, list out all the hazards identified with regard to cylinder head lifting job during main engine overhaul. Explain how do you carry out risk assessment for above mentioned job. (16)

Q9. Discuss the causes of corrosion in seawater pipelines on ships and methods used to prevent it. Explain in detail the systems implemented for corrosion prevention. (16)