EKG-Feb-20

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 company has requested you to re-commission the boiler. Write a letter to the Superintendent Engineer stating how the boiler was brought online and the safety valves adjusted.


Q2.A. Explain how analysis of used lubricating oil can be used as a “health-monitoring” tool for diesel engines.
B. Describe how vibration measurement can be used with a main engine turbo-charger:
i. For fault analysis;
ii. For condition monitoring with respect to maintenance;
iii. As a substitute to opening up machinery for survey.

Q3. With regards to main transmission shaft flange coupling arrangements:
A. Sketch a hollow type coupling bolt and the hydraulic head/nut and loading rod which are used to fit it;
B. Describe how the bolt is fitted;
C. State the advantage of the hollow coupling bolt as compared to the traditional type of coupling bolt.

Q4. A. Describe an automatic self de-sludging centrifuge suitable for dealing with fuel of density up to 1010 kg/m3 at 150C;
B. Explain how the centrifuge described in Q4 (a) is able to remove water from a fuel which has a density that is higher than that of water and state factors that may assist the operation.
C. As Second Engineer, write down the start-up procedure for the centrifuge described in Q4 (a) for the benefit of your staff;
D. State how the problem of catalytic fines in fuel oil may be dealt with.

Q5. A. Explain why centrifugal pumps cannot handle air or vapours to effect priming yet turbo- blowers operating on the same principle can.
B. If a vessel is fully laden, how may it be ascertained that the fire pump priming arrangements would operate satisfactorily in the ballast condition.
C. Explain a method of priming suitable for a centrifugal pump.

Q6. With reference to hydraulic steering gears, sketch and describe each of the following:
(A)Single failure concept;
(B)100% redundancy.

Q7. A. State why fixed pitch propellers have a poor efficiency when going astern.
B. With reference to controllable pitch propellers state:
i. Why is it preferable that the main servomotor be housed in the propeller hub rather than in the shafting forward of the propeller shaft?
ii. What regular maintenance and checks should be carried out to ensure maximum reliability of the gear at all times?

Q8. A. Describe a transverse bow thrust unit using CPP, mention how it should be made to support and how the strength of thrust and reverse thrust are achieved;
B. State with reasons, a suitable prime mover for the controllable pitch propeller;
C. State whether the thrust unit delivers a relatively low pressure head with high volume output or high pressure head with low volume output.

Q9. 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.