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Q1. Explain why auxiliary engine bottom-end bolts are prone to failure, even under normal running conditions. Identify those features, incorporated into the design of bottom-end bolts, to inhibit failure. Explain how this tendency is either aggravated or inhibited during maintenance and what checks are to be carried out. (16)

Q8. Write short note on the followings –

A. Metal – locking.

B.TIG and MIG welding.

C. Brazing.

D. Soldering.

Q9. With respect to the operation of two stage reciprocating air compressor. Explain:

A. The causes of occasional lifting of 2nd stage relief valve.

B. Breakage of valve plates.

C. Puncture of bursting disc of 1st stage intercooler.

D. Noticeable reduction in capacity of the compressors over a period of time.

Q4. Discuss on the classification society requirements with regard to maintenance and continuous survey of machinery.

Q5. A single forged shaft for a small gear pump is broken in the middle. Suggest some emergency repairs to the shaft to enable run the pump. State the type of repair and procedure for carrying out the repair. What is the most viable alternative to repair if no spares are available?

Q6. Describe the hull inspection that you would carry out as the senior engineer of ship in dry dock stating what defects you may find and the repairs that may be necessary with respect to;

A. Shell plating; B. Forward end of ship; C. Aft end of ship; D. Opening in shell plating; E. Rudder; F. Propeller and stern tube;

Q7. An Auxiliary boiler is periodically unattended and equipped with alarms to cover low water level, high steam pressure, and air and flame failure.

A. State why and how fuel the burners are automatically cut off under alarm conditions of water level, steam pressure, air and flame failure.

B. Describe how and when each of the above alarms is tested without endangering the boiler.

Q3. a) State the circumstances owing to which it may be necessary to renew a cylinder liner. (3)

b) Explain how the liner is removed (5)

c) Explain how the new liner is fitted.

State the important checks to be made before and after fitting. (5)

Q9. Abnormal vibration has been observed in an HFO purifier while in operation. Explain the areas you plan to investigate for rectifying the faults and put back the purifier back to normal operations keeping in view that no reduction in vibration has been noticed even after desludging the purifier couple of times.