Q4: An auxiliary engine exhibits a tendency to hunt to such an extent that the engine speed variation prohibits the connection of the machine to the switchboard. (a) Discuss the possible causes of hunting. (b) Explain how the problem of hunting can be rectified.
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.
Q8. A. Explain the action of EACH of the following metallurgical mechanism:
(i) Creep; (ii) Brinelling; (iii) Fretting; (iv) Fretting corrosion;
B .State, with reasons, where EACH of the mechanisms in occur in ship propulsion System.
Q4. With reference to hydraulic steering gears, sketch and describe each of the following: (A)Single failure concept;
(B)100 Percent redundancy.
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