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Q1. a) Explain metal fatigue and how fatigue failure occurs. (4)

b) Differentiate between high stress/low cycle and low stress/high cycle fatigue giving

example of each. (4)

c) How do defects in the metal influence the expected life of a component. (4)

d) How does fuel injection timing and cylinder power balance influence the possibility

of fatigue cracks developing in the bedplate. (4)

Q7. (a) Specify with reasons those parts requiring particularly close scrutiny during internal and external examinations of independently fired auxiliary boilers.

(b) With reference to these examinations distinguish between metal fatigue due to caustic embrittlement, corrosion fatigue, overheating (plastic flow) and direct overpressure.

Q4. Describe the procedure for overhauling Main Air compressor Valves (Plate type) and explain which parts require close attention. using sketches where necessary. Also describe the procedure for testing of these compressor valves.

Q6. With regard to keeping the gas side of boilers in good condition discusses EACH of the following:

A. the mechanism of combustion, stating the factors which are important to good combustion;

B. Oil fuel treatments;

C. Soot removal equipment;

Q2. Write short notes on following:

A. Magnetic Particle Inspection (MPI)

B.  Ultrasonic Testing (UT)

C. Radiographic Testing (RT).

Q6. a) State the circumstances owing to which it may be necessary to renew a cylinder liner of a 4-stroke auxiliary engine. (2)

b) Explain how the liner is removed. (5)

c) Explain how the new liner is fitted. (5)

d) State the important checks to be made before and after fitting. (4)

Q9. With reference to the Crosshead of Large two-stroke engines:

A. Explain how crosshead and guide shoe clearances are checked, in large 2 stroke engines

B. Explain how crosshead alignment is checked and adjusted.

Q1. With reference to fire pumps.

A. Explain how and when fire pumps should be tested, what are the requirements as per SOLAS74, as amended

B. Describe the routine maintenance to be carried out on the various fittings on a fire line, giving testing pressure where appropriate.

C. Describe briefly how will you dismantle a fire pump for survey. Give details of factors which will decide replacing the parts.

Q9. Severe engine vibration has recently become evident when the main engine for which you are responsible operates within a certain speed range –

A. State, with reasons, the possible causes of such vibration;

B. State the consequences of operating the engine under such vibratory conditions;

C. Describe the procedure you, as Second Engineer, would implement in order to investigate and rectify the problem.