DieselShip's Online Content Library

Q1) With reference to rotary vane steering gears:

(a) Describe, with the aid of a sketch, how such a unit incorporates an integral rudder carrier (10)

(b) Explain how vertical rudder movement is accommodated (6)

Q2) A main air compressor interstage air-cooler has burst. Put down a logical sequence of event that could have caused this accident. Put down your analysis, point by point and complete in technical detail (16)

Q4. A distinguishing feature of an eductor, when compared to other pumps, is the (16)

(a) Discharge end being smaller than the suction end

(b) Small size of impeller

(c) Lack of moving parts

(d) Ease at which the wearing rings may be changed

Briefly justify your answer.

Q4) Give an outline sketch of Heavy F.O. settling tank heating system and briefly explain the system. Sketch only the low-pressure steam inlet up to condensate collection tank (16)

Q5) The auxiliary boiler of a ship periodically needs feed water, and the rate of feed is gradually increasing every day, without an increase in demand. Suggest some causes for such a happening. (16)

Q6) Write short notes on the following:

(a) Need to ensure that D.O. service tanks are not heated beyond a certain temperature (4)

(b) Importance of the level of the F.W. compensating tank for jacket cooling of main engines as an indicator of impending trouble (4)

(c) Need to check remote stop of all F.O. installations regularly (4)

(d) Necessity for a proper check of all engine room parameters before taking over of watch (4)

Q7) The by-products of oxidation, as a result of water contamination of hydraulic oil are generally: (16)

(a) Removed by cellulose type filters

(b) Gums, varnishes, and acids

(c) Always neutralized by oil additives

(d) Harmless and have no effect on system components; Briefly justify your answer.

Q6. Explain the following terms and give examples of where each condition might occur

a) Stress Corrosion cracking (6)

b) Creep cracking (5)

c) Corrosion fatigue (5)

Q4. a) Whils't on ‘seawatch’ you observe that the Oil Mist detector (OMD) in the engine room has triggered an alarm, and in feeling the crankcase doors on the bottom platform, you find that the unit in question feels warmer than the rest. What pre-emptive action will you take as Watch-keeper to bring the situation under control. (10)

b) Draw a simple line diagram of an ‘OMD’ and explain it’s working. (6)