DieselShip's Online Content Library

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

i) The risk associated with opening the unit. (5)

ii) The precautions taken to reduce the risk. (5)

(b) Explain the significance of biological oxygen demand (B.O.D). (6)

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)

Q1. Oil traces have been found in the condensate tank of an auxiliary boiler:

(a) Describe the procedure to trace the source of contamination (8)

(b) List the contamination with reasons for its occurrence and the precaution to be taken to ensure safety of the boiler (8)

Q2. (a) Describe how cylinder liners are checked for wear (5)

(b) Explain how these measurements are recorded (5)

(c) Explain why allowance for wear is limited and what extent of the wear governs liner replacement (6)

Q3. State some built in measures by which the steering gear mechanism can be kept operational, in the event of breakages, pipe failures, motor burn out etc. (16)

Q4. Where a waste heat boiler is subject to persistent leakage at the tube / tube plate connection, suggest with sketches, methods of effecting a permanent repair. (16)

Q5. (a) What are the routines carried out on a lifeboat winch (6)

(b) What maintenance do the hand brake and Centrifugal brakes require (5)

(c) At what lowering velocity does the centrifugal brake operate (5)

Q6. Give reasons and remedies for the following faults in air compressors.

(a) Excessively hot discharge pipe (5)

(b) Intermediate stage relief valve lifting (5)

(c) Noticeable reduction in free air delivery (6)

Q7. With reference to auxiliary boiler safety valves state with reasons:

(a) What clearances need checking when lapping valves to seats (5)

(b) Why the drain must be clear (5)

(c) Why opening gear should be kept in good working order at all times (6)

Q8. With reference to a fuel oil purifier:

(a) What are the reasons that may cause the purifier to overflow? (6)

(b) What are the reasons for the water carry-over with the oil? (5)

(c) What are the probable reasons for vibration seen during purifier starting? (5)

Q9. Explain with a suitable diagram, the components of an auxiliary engine fuel valve? Briefly explain, the process of overhauling and pressure testing the fuel valve? (16)