EKG-FEB-19

Q1. A. Explain Creep; Brenelling; Fretting; Fretting corrosion; State, with reasons, where these may occur in ship propulsion System.

Q2. You were asked to join a ship as second engineer. During briefing you were informed about frequent boiler uptake fires happening onboard. prepare a plan for to reduce boiler uptake fires. How will you monitor the progress of your plan and what instructions you will issue to the watch keepers?

Q3. Sketch and describe a “fail safe steering gear” suitable for use on a tanker of more than 1,00,000 T DWT; Explain the sequence of events that take place when an oil leak takes place in one of the hydraulic pipe lines.

Q4. Describe the importance of maintaining the quality of lube oil in maintaining the proper health of marine diesel engines highlighting the role of (a) Automatic back flushing filters. (b) Lube oil separators (c) Magnetic filters (d) Visual Inspection (e) Periodic laboratory tests.

Q5. With respect to properties of fuel oil, explain the significance of the following terms;(a) Calculated Carbon Aromaticity Inbox (CCAI).(b) Open flash point and Closed flash point. (c) The importance of Sodium to Vanadium Ratio. (d) Octane Number.

Q6. With reference to Boiler water tests carried out onboard:

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 reserve only.
4. Increase in oxygen levels only.
B. State why the complete results of boiler water 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.

Q7. With respect to refrigeration gases used on-board vessels, answer the following:-

A. Explain Ozone Depleting Potential (O.D.P) and Global Warming Potential (GWP) of conventional refrigerant gases
B. Name the alternate refrigerant gases available and being used onboard.
C. Explain the steps you will take to ensure that release of refrigerant gases from the plant is minimized during normal operation and during maintenance activities.

Q8. Sketch a sealing arrangement for an oil lubricated stern tube. Identify the common form of seal failure; State how oil loss due to seal failure can be restricted whist on passage? What material is used for sealing ring and propeller shaft liner?

Q9. As second engineer onboard a tanker, describe the procedure for presenting a Main Boiler for survey by a classification society.