DieselShip's Online Content Library

Q6. With regard to keeping the gas side of boilers in good condition discusses EACH of the following:

A. the mechanism of combustion, stating the factors which are important to good combustion;

B. Oil fuel treatments;

C. Soot removal equipment;

Q2. Assume you are instructed to submit to the superintendent engineer a complete set of indicator cards together with data. Give full account of your work in taking the cards and preparing them for submission. Tabulate the data you forward, both that extracted from the cards and otherwise obtained, by giving typical figures taken from a large 2 stoke slow speed main propulsion unit.

Q3. A. State the indication that main boiler generating tube is leaking i. When the amount is small; ii. When the amount is large. B. If boiler tube failure is evident describe immediate action necessary to stabilize plant.

Q8. A. Sketch a transmission shaft coupling which enables the propeller shaft to be withdrawn outward.

B. (i) describe the coupling and method fitting and dismantling;

(ii) state how the grip of the coupling can be checked when fitted;

(iii) why should coupling bolts be interference fits

(iv) State what precaution should be taken when dismantling the coupling.

(V) State reasons why the metal that the intermediate and tail end remission shaft are made of.

Q9. Write short note on the followings –

A. Metal – locking;

B.TIG and MIG welding;

C. Brazing;

D. Soldering.

Q9. A. With reference to the insulation testing of marine electrical plant: - I. State the reasons for insulation testing; II. State the precautions to be observed when testing intrinsically safe equipment. B. Describe the overhaul of d.c. motor which has been subjected to excessively damp condition or flooding with seawater.

Q8. Explain in detail how you would isolate one of sprinkler system for routine maintenance. Describe all tests and inspections you would make and how you would return the system to service.

Q8. Explain how each of the following conditions contributes to the satisfactory performance of oil centrifuges. A. Correct bowl speed; B. Cleanliness of bowl; C. Low rate of feed to the bowl; D. Contaminated oil preheated prior to centrifuging; E. Contaminated oil allowed standing for an appreciable time prior to centrifuging.

Q6.(a) Suggest four reasons why the temperature of the oil in the steering gear system may  become excessive.

(b) With reference to steering gears explain how the ship may be steered in each of the following circumstances;

(i) destruction by fire of the primary supply cable;

(ii) destruction by fire of the telemotor lines;

(iii) bearing failure in the running pump;