DieselShip's Online Content Library

Q1. You had to discharge to shore 200 tonnes of emulsified and contaminated fuel oil. You had attempted to purify this oil but were unsuccessful. Write a report to your head office explaining the above, how the oil became emulsified and contaminated, and what steps have been taken to prevent a re-occurrence

Q2. Describe in detail each of the following processes and give an example where each is likely to occur in marine engineering: State how in each case the initiation of the process is prevented or minimized. A. Corrosion fatigue; B. Stress corrosion; C. Creeping cracks; D. Casting cracks

Q3. Separation rate is inconsequential in oily water separators. Discuss with reasons the one statement that is not correct regarding oily water separators. - A. Test cocks are situated to locate the oil-water interface; B. Separation rate is inconsequential; C. Overboard discharge is inconsequential; D. Rise in temperature assist in the separation process; E. Rate of separation is unrestricted

Q6. State why the temperature of lubricating oil supplied to an engine needs close control. Sketch and describe an arrangement and explain the principle of operation of instrumentation and control equipment for automatically maintaining the temperature of lubricating oil supplied to an engine at its desired value

Q8. A. Explain the necessity of intercoolers on a multi-stage compressor. What attention is required to keep them safe and in good working order? Sketch and describe an intercooler suitable for a 2400kPa compressor and state materials used.

B. What attention is needed before opening up an air compressor for inspection?

C. What faults are likely to develop in an air compressor and how are they remedied?

Q8. Explain how the ingress of sea water is prevented in an oil lubricated stern bearing system. Should the system fail, describe the corrective action possible whilst the vessel is afloat. State why two stern bearing oil header tanks are fitted in some instances?

Q7. Sketch and describe a stockless anchor illustrating the method or device used to attach it to the chain cable. When the anchor and cable are ranged during the ships underwater survey what parts require special attention and what defects are likely to be discovered?

Q9. A. What are the conditions required in the cylinders of a marine diesel engine for good combustion? B. State under normal working conditions how the following may occur Black smoke, White smoke, Blue smoke. C. What may be the suspected cause for each case to occur? What would be the remedy for it?

Q9. With reference to multi-tubular heat exchangers explain:

(A) How and where impingement attack is likely to occur in the tubes

(B) Why is it desirable that coolant flow rate should not exceed that required to maintain correct fluid temperature

(C) Ample well-shaped water boxes and smooth tube inlets are desirable

(D) Partial obstruction of tube bore is a common cause of tube failure