EKG-Dec-20

Q1. 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 backflushing filters. 
(b) Lube oil separators 
(c) Magnetic filters 
(d) Visual Inspection 
(e) Periodic laboratory tests.



Q2. You were asked to join a ship as a second engineer. During the briefing, you were informed about frequent boiler uptake fires happening on board. Prepare a plan to reduce boiler uptake fires. How will you monitor the progress of your plan and what instructions you will issue to the watchkeepers?

Q3. A. With reference to fatigue of engineering components;

A. Explain the influence of stress level at a cyclical frequency on expected operating life.;
B. Explain the influence of material defects on the safe operating life of engineering components;
C. State the factors which influence the possibility of fatigue cracking of an auxiliary boiler feed water pump shaft and explain how the risk of such cracking can be minimized.

Q4. Sketch and describe the operation of four rams electro-hydraulic steering gear systems. Indicate and explain the valve position for the operation of the system when one pump is isolated and the unit is operating on two rams only.

Q5. With reference to Flue gas Inert gas system:

A. Sketch and describe using a line diagram showing a typical 'Inert Gas System' used for inerting the cargo tanks of oil tankers, labelling the component parts.
B. State what oxygen content you would expect in the flue gases if good combustion is achieved.

Q6. Sketch a sealing arrangement for an oil-lubricated stern tube. Identify the common forms of seal failure; State how oil loss due to seal failure can be restricted whilst on passage? What is the material used for sealing rings and propeller shaft liner?

Q7. With reference to Gear pumps used for lubricating oil transfer.

(a) Sketch and describe a gear-type pump indicating the flow of fluid. 
(b) state the materials that gear type pump components may be manufactured from. 
(c) specify THREE applications that are suitable for the employment of gear type pumps.

Q8. With reference to the fuel standards, ISO-8217-2017 discuss the amendments made as compared to its previous edition. Explain the significance of the following: 

(a) Pour point, cloud point and cold filter plugging point. 
(b) Cat fines 
(c) Fatty Acid methyl Easter 
(d) Dissolved H2S in fuel.

Q9. With reference to vacuum sewage system: 

(i)   Sketch & Describe a Vacuum Sewage System.
(ii)  State the advantages of the Vacuum Sewage System.
(iii) State the different causes of dropping vacuum.