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Q8. (a) State THREE modes of heat transfer. (1)

(b)Describe how the design requirements of EACH of the following are met, detailing the materials used to promote or retard heat transfer:

(i)plate cooler in central cooling system;(3)          (ii)meat room in domestic provisions space;(3)  (iii)auxiliary steam system pipelines. (3)

Q2. (a) Describe, with the aid of a sketch, the principle of operation of a modern shaft torsion meter. (8)

(b) Explain why it is important in terms of hull efficiency to measure and compare shaft torque and speed. (2)

Q3. Describe, with the aid of a sketch, the principle of operation of a radial lip stern tube sealing arrangement for an oil filled stern tube, which incorporates an air space and is designed to prevent pollution. (10)

Q5. (a) Describe TWO systems of priming centrifugal pumps. (6)

(b) List the advantages of EACH of the priming methods described in part (a). (4)

Q5. With reference to multi-tubular heat exchangers, explain how EACH of the following contribute to satisfactory performance:

(a) tube wall thickness;(2)              (b) dense population of tubes in the tube plate;(2)

(c) tube materials selection;(2)       (d) coolant flow rates;(2)

(e) unimpeded passage of coolant at entry and exit from the tubes. (2)

Q6. (a) Sketch a diagrammatic arrangement of a fully automatic direct expansion domestic refrigeration system which supplies a number of cold rooms. (5)

(b) State, with reasons, FIVE desirable thermodynamic properties of a refrigerant. (5)

Q7. Following a serious machinery space fire, the engine room was abandoned and an inert gas smothering agent used to extinguish the fire.

Write a report to the Superintendent Engineer detailing the sequence of events which led to this course of action and the subsequent actions taken to enable the vessel to proceed on passage. Include conclusions and recommendations in the report. (10)

Q8. During bunkering operations, a section of deck bunker line starts leaking fuel oil from a pinhole at the mid-section of the pipe.

(a) As Chief Engineer Officer, state the immediate actions to be taken to avoid a potential pollution incident; (4)

(b) Explain how a permanent repair could be made, stating any precautions to be taken and any further inspections that would be required. (6)

Q9. With reference to the protective devices fitted to a main alternating current generator, explain EACH of the following:

(a) overcurrent and short circuit protection; (2)

(b) generator negative phase sequence; (2)

(c) loss of field (excitation); (2)

(d) undervoltage; (2)

(e) reverse power. (2)

Q10. (a) State the consequences of using direct online starters for comparatively large-sized a.c. induction motors. (2)

(b) Describe, with the aid of a sketch, an electronic soft starting system that may be used for large-sized a.c. induction motors.  (8)

Q11. Explain the meaning of EACH of the following types of electrical equipment:

(i) intrinsically safe; (2)        (ii) flameproof; (2)     (iii) increased safety; (2)

(iv) pressurised enclosure. (2)

(b) State TWO types of lighting equipment that may be installed in the pump room areas of a crude petroleum carrier. (2)

Q13. With reference to roll reduction systems:

(a) explain the principle of operation of bilge keels, stating their advantages; (4)

(b) describe TWO other methods of roll reduction, stating the advantages and disadvantages of EACH system. (6)

Q11. (a) Explain the principle of operation of an insulation resistance test, stating why the test is carried out on a regular basis. (6)

(b) Describe how EACH of the following electrical tests is carried out:

(i) resistance; (2)

(ii) continuity. (2)

Q13. (a) Explain why fatigue cracks occur in a ship's hull, stating the locations where they may be found. (3)

(b) Describe the hull inspection that should be carried out m drydock to ascertain the maintenance and repairs that may need to be carried out. (7)

Q12. With reference to structural fire protection in passenger ship accommodation spaces:

(a) define the meaning of Class A bulkheads, stating the requirements; (3)

(b) discuss the design of ventilation systems to prevent the spread of smoke and fire; (5)

(c) explain how the integrity of the bulkhead is retained with respect to ventilation trunkings, where A Class bulkhead have to be penetrated. (2)