DieselShip's Online Content Library

Q1. With regard to care of lubricating oils onboard, answer the following:

(a)  Microbial degradation of lubricating oil and measures to prevent the same

(b)  Methods of ensuring correct sampling is done for the purpose of shore based testing.

(c)  If the shore based testing results show an abnormal values of water content and TBN for the crank case lub oil of a slow speed main engine, what will be interpretation and subsequent action?

Q1. You have recently joined a vessel as Second Engineer Officer. For the past several voyages it has been the practice on board to dispense with the use of the exhaust gas boiler and leave it to run dry. As part of an overall economy drive the company wanted to re-commission the exhaust gas boiler. Explain as a second engineer officer, what inspections, checks, recommendations and precautions you will exercise/ensure for this exhaust gas boiler with regard to re-commissioning and bringing this exhaust gas boiler into service. how exhaust gas boiler safety valves adjusted.

Q4. Sketch a sealing arrangement for an oil lubricated stern tube.

a) Identify the common forms of seal failure. (6)

b) State how oil loss due to seal failure can be restricted whilst on passage. (5)

c) What is the material used for sealing rings and propeller shaft liner? (5)

Q2. With reference to reciprocating air compressors explain why.

A. Clearance volume is critical to efficiency.

B. Spring-loaded plate valves are invariably used.

C. Compression is accomplished in apparently unequal stages.

D. Inter cooling is used between stages.

Q6. With regard to refrigeration system explain;

A. What are the possible reasons for HP cut out in the refrigeration system?

B. What are the indication if air is present in the refrigerant system and how to remove air from refrigeration system?

C. How unloader works in refrigeration system?

D. What are the possible reasons for Icing on evaporation coil?

E. Why compound gauge fitted in refrigeration system?

Q4. Reverse osmosis is the modern alternative for shipboard production of drinking water.

(a) Describe using simple diagrams if necessary, the principle of reverse osmosis. (8)

(b) Sketch a line diagram showing a single pass system for producing fresh water from sea water and describe the system. (8)

Q8. A. Explain the action of EACH of the following metallurgical mechanism:

(i) Creep;          (ii) Brinelling;   (iii) Fretting;     (iv) Fretting corrosion;

B .State, with reasons, where EACH of the mechanisms in occur in ship propulsion System.

Q9. With reference to Vacuum Sewage System

(a) Sketch & Describe a Vacuum Sewage System.

(b) State the advantages of Vacuum Sewage System.

(c) State the different causes of dropping vacuum.

Q7. Compare the destructive testing done on engineering materials with non-destructive testing done on engineering components. Briefly describe one destructive test and two non-destructive tests to illustrate your answer