Q3. Sketch and describe a boiler water level controller of the float operated type. State the reasons for having this mechanism on the boiler and using this controller and boiler for analogy explain the following terms.
A. Detecting element
B. Servo motor
C. Desired Value
Q7. Discuss the causes of corrosion and the means by which corrosion of the following may be limited by manufacturers and ship’s personnel respectively:
A. Internal and External surfaces of auxiliary steam lines;
B. External surfaces of auxiliary boilers;
C. Water boxes of seawater coolers and condensers;
D. Main sea water inlet pipes.
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.
Q4. A. Describe with the aid of sketches where necessary a vane type steering gear showing how to weight of the rudder and stock are carried and the arrangement that allow for wear down;
B. State how the vanes described in (A) are secured and the method of sealing the edges;
C. State how, if necessary, the steering gear is locked for rudder maintenance.
Q6. A. State, with reasons, the causes of fatigue cracking of engineering components; B, State, with reasons how material and design defects can influence fatigue life. C. With reference to engine bed plate transverse girders explain how the incidence of fatigue cracking can be minimized.
Q8. A. State the advantages of using steam turbine propulsion power for vessels carrying LNG cargo. B. With regard to the use of L.N.G. cargo as boiler fuel explain: (i)The safety precautions relating to the gas pipeline supplying the boiler and burning the gas in the boiler, (ii) The means of getting rid of “excess gases” during loading or discharge.
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.
Q9: A new vessel exhibits severe aft end vibration
A. As a Second Engineer Officer, outline a procedure to investigate and identify the source of vibration
B. Suggest possible remedies to obviate / reduce aft end vibration.
Q9: With reference to sleeved keyless propeller assemblies: A. (i) State, with reasons, the metals used in the manufacture of the sleeve and tail end shaft; (ii)State the type and thickness of material used to bond the sleeve to the propeller boss. B. When removing the propeller from the tail end shaft, state why the following procedures are not recommended: (i) Application of push off force by means of wedges or jacks and draw off force by strong back; (ii) Expansion of propeller boss by concentrated local heating with gas torches. C. State the correct procedure for the removal of the propeller from tail end shaft
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