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Q2. 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 levels only. B. State why the complete results of boiler 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. Explain how EACH of the following hull defects should be dealt with;

(a) A cracked weld;

(b) A severe indentation in way of a frame;

(c) Surfaces suffering from general corrosion although the extent of wastage does not warrant plate replacement;

(d) A bilge keel fractured at the forward end.

Q7. A. With the aid of a simple sketch, explain the operation of a basic air-conditioning unit. B. With reference to your sketch, explain the following: - i. How the problem of increase in humidity on cooled air is overcome; ii. How discomfort caused by the excessive drying effect of heated air is overcome. C. Explain how a psychometric chart is used to check conditions.

Q6. Sketch and describe a pneumatically operated control valve Explain how the valve is operated if the controller fails. Discuss the routine maintenance required for these valves.

Q4. Accidents regularly occur due to premature or accidental release of CO2 into machinery spaces. With reference to this, enumerate the procedure or arrangement that you as second engineer would adopt with respect of the following

A.  Contractors working on CO2 system;

B. Understanding between bridge and engine room in the event of a machinery space fire;

C. Familiarizing staff with the system;

D. Checks and tests are carried out before putting system in operation?

Q6. With reference to auxiliary boiler safety valves: Describe how the valves are set to lift at the desired pressure under steam; Describe the precautions to be taken to ensure that the valve cannot be tampered with after setting is completed; Explain how safety valve can be opened manually in an emergency.

Q6. A. Describe the survey procedure of an oil lubricated stern bearing and shaft. (8)

B. Explain how the integrity of the outboard seal of an oil lubricated stern tube may be proved before the dry-dock is flooded. (8)

Q2.  A. As Second Engineer, outline your instructions to members of the ship’s engineering staff for inspection of the main engine timing chain; B. The inspection in A. has revealed that the roller chain needs replacement. Describe how this is achieved.

Q9: A heavy Oil purifier vibrates badly when just shutting down and coming to a stop. Suggest some reasons for this vibration problem, when you have already made an inspection of its drive mechanism and casing and found nothing unusual.