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)

Q1) With reference to electric arc welding:

(a) Draw a labelled sectional sketch of a satisfactory butt weld (8)

(b) Discuss the advantages and disadvantages of using alternating current and direct current in this type of welding (8)

Q8.a) Sketch a two-ram type hydraulic steering gear with a single Electro-hydraulic pumping unit. Show the hunting gear arrangement and indicate valve positions. (8)

b) State the purpose of, and describe the operation of (8)

i) hydraulic shock/buffer valves.

ii) Oil replenishing tank.

iii) Hunting gear.

Q3) A controllable pitch propeller on a diesel driven vessel eliminates the need for: (16)

(a) Friction clutches

(b) Disconnect clutches

(c) Reversing gears

(d) Reduction gears

Justify your answer and explain the working of CPP in brief.

Q4) Describe with the aid of suitable graph, the discharge characteristics of a centrifugal pump. Explain why it does not require a relief valve (16)

Q5) With regard to a reciprocating refrigerator compressor.

(a) Sketch the mechanical shaft seal showing its component parts and how it is lubricated (8)

(b) Describe the sealing arrangement stating the materials used for the component parts (4)

(c) State the effect on the environment of the release of refrigerants into the atmosphere (4)

Q6) (a) Sketch an auxiliary boiler ‘blow down’ valve. Explain how it differs from its shipside counterpart (10)

(b) Describe the sequence of ‘blow down’ procedure (6)

Q7) Submit a report to the Chief Engineer stating how the freshwater generator output on board you ship was increased to near optimal values. The report should specifically mention the adjustments, corrections and improvements executed (16)

Q8) Write short notes on the following:

(a) Need for draining F.O. Services tanks regularly (4)

(b) Need to ensure engine control room temperature is correctly maintained (4)

(c) Need to ensure that service air is kept dry by all means (4)

(d) To ensure that all guard rails are in place properly secured in the engine room (4)

Q9) Sketch and describe a contra flow type heat exchanger for the auxiliary engine applications. (16)