Q2. Describe, with the aid of sketches, the principle of centrifugal separation as used in fuel and lubricating oil purifiers (16)
Q4. With reference to an aerobic sewage treatment plant:
(a) Explain the need for continuous aeration (6)
(b) Describe the hazards that may be present when the plant requires internal maintenance or inspection. (10)
Q5. (a) With reference to contents and use, describe how a portable fire extinguisher is identified (4)
(b) State, with reasons, the type of fire extinguisher normally found in the engine control room. (4)
(c) List the actions to be taken prior to the operation of a bottled CO2 fire fighting system. (8)
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