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Q7. (a) Why is heat treatment necessary for carbon steel? (6)

(b) Describe the various heat treatment processes and their benefits. (10)

Q6. (a) Describe the constructional features of plate type freshwater generator and its operational procedures for fresh water generation. (6)

(b) State the temperatures and pressures at salient points. (4)

(c) State some of the advantages and limitations that exist in using a plate type heat exchanger. (6)

Q3. Some of the common problems found in Auxiliary diesel generator engines can be due to,

(i) Power Imbalance. (4)

(ii) Degradation of Lubricating Oil. (4)

(iii) Exhaust gas high temperature. (4)

(iv) Unusual Knocking Sound. (4)

State how to identify these problems during engine operations, and the action steps that you shall take as a watch keeper.

Q4. Explain the procedures to be followed before, during and after taking bunker and transferring of the bunker; (8)

(i) State the checklists to be adopted before, during and after bunkering. (4)

(ii) Make a schematic showing the storage and fuel transfer lines on board. (4)

Q5. Describe the functional components of a reefer plant for the domestic refrigeration. system and temperatures to be maintained in different cold rooms; (8)

i) Describe the pressure switches; (2)

(ii) The tubular heat exchanger; (2)

(iii) The Oil separator and, (2)

(iv) The drier system. (2)

Q6. i) Sketch and describe a biological sewage treatment system. (6)

ii) How does the biological Sewage Treatment Plant work? Explain. (6)

iii) What is understood by the term BOD? What factors affect BOD. (4)

Q7. (i) What is an 'eductor'? State it's function. (4)

(ii) Explain the working principle of an eductor, explain in slight detail. (6)

(iii) Draw an eductor and name it's parts. Show how it is connected to a tank ‘stripping’ arrangement. (6)

Q7. a) What are the Safety Devices fitted to an Air Compressor? (4)

b) What is the purpose of the Scum Valve on a Boiler? (4)

c) What is the function of an evaporator in a Refrigeration System? (4)

d) Regarding the Emergency Bilge Injection Valve, what is its relevant size compared to the Main Sea Water Injection Valve? (4)

Q5. With regard to keeping the gas side of boilers in good condition,

Discuss EACH of the following.

1. The mechanism of combustion, stating the factors which are important to good combustion (6)

2. Oil fuel treatment (5)

3. Soot removal equipment (5)