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Q1. (a) State FOUR reasons for persistent slackening of holding down bolts of a main engine. (6)

(b) State FOUR precautions to be observed when fitting non-metallic chocks in order to ensure accurate choking. (4)

(c) State the periodic checks to be made in order to assess the effectiveness of an engine chocking system. (6)

Q5. A biological sewage system develops a fault, which necessitates opening the unit for repair. Explain the following:

(a) The risk associated with opening the unit. (6)

(b) The precautions taken to reduce the risk. (6)

(c) Explain the significance of biological oxygen demand (B.O.D). (4)

Q3. Work is being carried out in drydock on a large sea water inlet chest and the valves. Describe the inspection you would carry out:

(a) As the work starts (8)

(b) During and after the work. (8)

Q4. (a) How are heat exchangers protected from the effects of corrosion? (8)

(b) What are the problems associated with biofouling? (8)

Q5. Describe the procedure for the regular maintenance routines to be carried out on the Fixed CO2 fire-fighting system. (16)

Q6. A jacket cooling water, plate type cooler for the engine system is stripped open during overhaul for survey purposes, State out a list of components, parts or areas, which you would like to particularly check yourself before the survey. (16)

Q7. During the watch main engine crank case mist detector alarm has sounded.

(a) List the steps to be taken to meet this emergency situation. (8)

(b) Subsequent inspection and action required to put the engine on normal operation (8)

Q8. With reference to starting air receivers:

(a) Explain why starting air receivers should be drained frequently. (6)

(b) Describe the procedure for the inspection of the internal surfaces of an receiver, indicating the possible defects, which may be encountered. (10)

Q9. During recent periods of manoeuvring, a number of air start valve bursting discs or cones have failed. In the circumstance, indicate how the actual cause might be:

(a) Detected (8)

(b) Rectified (8)