DieselShip's Online Content Library

Q1. Sketch and describe a main lubricating oil pump. Which are the clearances to be checked?

Q2. Describe the construction of a 3-stage air compressor; Give the temperatures and pressures at each stage; Where are the drains; what type of oil is used and why; Why inter cooler are used in multistage compressor.

Q4. A. Identify the chief causes of overheating in tunnel bearings and of vibration in main shafting. B. Explain why the seating of the engine room amidships enhances these tendencies. C. State how overheating and vibration may be reduced or eliminated.

Q5. A. Examine in detail three common but entirely different reasons for loss of steering gear systems. B. State how failure is inhibited in the design, operation and maintenance of steering gear systems C. Describe how a vessel may make port upon irreparable failure of the steering telemotor

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

Q9. With reference to main refrigeration plant give a reason for each of the following operational irregularities and state how it is dealt with: A. Rapid loss of crankcase lubricating oil in a “vee” block machine; B. Gradual “fall off” in the refrigeration effect over a comparative short period of time; C. Icing up at compressor suction; D. Frequent cutting off of compressor on high pressure.