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Q8. A Rating has been seriously injured by a "blow back" from the oil fired auxiliary boiler. As Second engineer, make a full report to Head office explaining the circumstances of the incident and the precautionary measures now taken to reduce the possibility of a similar occurrence in the future.

Q5. A. Sketch a four-ram steering gear arrangement capable of 100% redundancy; B. Describe the operation of the arrangement sketched in A.

Q5 A. Describe a transverse “bow thruster” unit; Mention should be made of where it is fitted, how the propeller hub with shafts and internal bevel gear drive are usually supported and how the maneuvering oil is conveyed to the propeller main servo-motor.  Also, mention how strength thrust and reverse thrust are achieved; B. Give reasons why the standard constant speed non-reversing type electric motor is preferred as the prime mover rather than a diesel engine.

Q5.A. Sketch a watertight door and frame showing the manner of attachment to the bulkhead and the additional reinforcement carried by the bulkhead to compensate for the aperture.

B. Explain how water tightness of the door and frame mating surfaces is ensured with hydrostatic pressure tending to force the faces apart.

C. (i) Describe the means of closing the door;

(ii) State the number of closing stations and the position of each.

Q5. A. State why fixed pitch propellers have a poor efficiency when going astern.

B. With reference to controllable pitch propellers state:

i. Why is it preferable that the main servomotor be housed in the propeller hub rather than in the shafting forward of the propeller shaft?

ii. What regular maintenance and checks should be carried out to ensure maximum reliability of the gear at all times?

Q9. Give reasons why each of the following features is considered desirable in air compressors. A. Smooth air passages with minimum obstruction at valves; B. Minimum clearance volume C. Multi-tubular heat exchangers; D. Generous size of suction filter.

Q7: Describe the following conditions are prevented in auxiliary boilers- A. Feed contamination by oil heating coil drains; i. Internal corrosion; ii. Furnace blowback; iii. Uptake fire; iv. Furnace distortion; Difficulty in maintaining normal water level.

Q1. You have been appointed as Second Engineer of an older vessel which is in dry-dock and recently been purchased by your shipping company. Describe, in detail about your inspection, to ensure that the equipment’s on-board ship related to safety equipment survey are satisfactorily complied with. (16)

Q5. With reference to Boiler water tests carried out onboard:

A. Discuss the possible reasons for the following changes in boiler water test results, and state what actions should be taken in each case;

1. Reduction in total dissolved solids and chemical reserves.

2. Reduction in phosphate reserve, with increase in chlorides and total dissolved solids;

3. Reduction in alkalinity reserve only.

4. Increase in oxygen levels only.

B. State why the complete results of boiler water tests are logged or entered into a data retrieval system rather than a note being made of any particular result which may be outside set limits.