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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.

Q1. With respect to Windlass and deck Machinery:

(a) Describe the principle of coil-operated brake suitable for winches and other deck machinery.

 (b) Explain with suitable sketches how the windlass is relieved of strain when riding at anchor.

Q2. With reference to the carriage and pumping of liquefied gas cargo:

A. Sketch a suitable pumping system labelling the component parts;

B. State;

i) Why submerged hydraulically driven pumps are not used;

ii) How overheating of pump drive shaft bearings is avoided;

C. State, how the risk of fire and explosion in cargo tanks is obviated both in the loaded and discharged condition.

Q9. (a) Explain electro chemical reactions and the difference between oxidation and reduction electrochemical reactions with examples. Which reactions occurs at the anode and cathode?

(b) Explain galvanic corrosion and discuss the different procedures to prevent it.

Q3. Damage has occurred to the main engine valves and the fuel supplied at a particular port is suspected. The owner’s case, however, in the subsequent dispute may be weak because the fuel was ordered specifying only type and viscosity.

A. Apart from fuel specification, describe how you, as Second Engineer, should have assisted the owners’ case when receiving the suspect fuel.

B. Describe the ISO fuel standard that is to be used when ordering bunker fuel.

C. Explain how the correct fuel standard is selected.

D. Suggest, with reasons, why particular mention should be made of certain elements that might not be included in the fuel standard.

Q7. With respect to the refrigeration system on board vessels, answer the following

a) Why are some TEVs fitted with an external equalizing connection?

b) What is the purpose of a back pressure valve. what will the effect if it leaks?

c)How does an electronic TEV function.

Q4. Describe with a sketch a pneumatic relay and show how feedback can be achieved when such a relay is used in conjunction with a flapper mechanism.

Q8. Discuss some of the factors which effect the shaft alignment of ships propulsion shafting. Suggest the most effective methods adopted for achieving the best possible alignment? (16)

Q9. With reference to main boiler super heater arrangements:

A. Compare the advantages and disadvantages of contra flow with parallel flow design.

B. Describe how the element tube banks are supported yet allow for expansion.

C. Describe how boiler carryover affects super heater effectiveness and condition.