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Q4. Considering that the engine room is the most common single space on board ships for fire to break out, discuss the merits and demerits of the following fixed firefighting systems: (20)

(a) Carbon dioxide

(b) Pressure water spray

(c) High expansion foam

Q2. Describe an emergency electrical power generating plant for use in the event of a complete failure of the main electrical power and make reference to -

a) Location (4)

b) Starting arrangements (4)

c) Fuel oil and its supply (4)

d) Cooling system (4)

e) Periodic attention required (4)

Q3. a) How is the number of Carbon Dioxide (CO2) bottles required for a ship calculated for (i) machinery spaces and (ii) cargo spaces? (12)

b) What means are provided to prevent the inadvertent release of CO2 in the engine room or other protected spaces? (8)

Q4. During the loading of a petroleum tanker, the incoming cargo forces out from the tank its previous atmospheric contents (air-vapour-inert gas).

Explain:

(a) The dangers of venting during the loading via open tank hatches (10)

(b) Why the pressure/vacuum valves is not used for venting (10)

Q5. (a) Describe the changes which take place within a lead-acid battery during discharge and when charging is taking place (10)

(b) What are the safety features you would find in (10)

(i) Paint store

(ii) Battery room

Q6. a) What are the different types of garbages that are generated on board as per Marpol Annex V, and what are the provisions for dealing with them? (10)

b) State the requirements for maintaining Garbage management plan and Garbage Record Book, Name the entries to be made in garbage record book. (10)

Q6. Petroleum vapours are a dangerous substance and when mixed with air can be ignited. With this in mind, briefly describe,

a) An explosimeter or combustion gas indicator which can be used to check the atmosphere of a tank or pump room. (10)

b) Describe the explosimeter and its operation. (10)

Q8. (a) The Centrifugal ballast pump in the engine room also doubles as a fire pump in your ship. What specific precautions would you take to change over the ballast pump from ballast / de-ballast mode to a fire pump mode (10)

(b) How is the emergency bilge suction tested? (10)