EKG-AUG-19

Q1. With respect to properties of fuel oil, explain the significance of the following terms;(a) Calculated Carbon Aromaticity Index (CCAI).(b) Open flash point and Closed flash point.(c) The importance of Sodium to Vanadium Ratio.(d) Octane Number.

Q2. 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. 

Q3. With Respect to Container Ship: -A. Sketch a ship’s indirect refrigeration system arranged for cooling containers stowed in stacks in the hold; B. Describe the refrigeration system sketched in (A); compared with containers with their own refrigeration self-contained units.

Q4. With reference to Vacuum Sewage System: (i) Sketch & Describe a Vacuum Sewage System. (ii) State the advantages of Vacuum Sewage System. (iii) State the different causes of dropping vacuum.

Q5. Reverse osmosis is the modern alternative for shipboard production of drinking water. A. Describe using simple diagrams if necessary, the principle of reverse osmosis. B. Sketch a line diagram showing a single pass system for producing fresh water from sea water and Describe such a system.

 

Q6. Discuss the means by which corrosion of the following may be limited by manufacturers and ship’s personnel respectively: A. Internal and External surfaces of auxiliary steam lines; B. External surfaces of auxiliary boilers; C. Water boxes of sea water coolers and condensers; D. Main sea water inlet pipes.

Q7. With reference to Flue gas Inert gas system: a. Sketch a line diagram showing a typical ‘Inert Gas System’ used for inerting the cargo tanks of oil tankers, Describe the system labeling the important component parts. b. State what oxygen content you would expect in the flue gases if good combustion is achieved.

Q8. 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.

Q9. With reference to auxiliary boiler safety valve: A. Describe, with aid of a Sketch the safety valves for an auxiliary boiler; B. Identify, with reasons, the part that require particularly close attention during overhaul; C. Describe how the safety valves are reset after an overhaul.