Q4. (a) Explain how the build-up of residue in the scavenge space of a large slow speed two stroke engine is minimised by design, operation, and maintenance.
(b) Explain the possible damage which could be caused by a scavenge fire.
Q7. a) State the causes of scavenge fire in a two-stroke engine and explain how the possibility of such an occurrence can be reduced. (10)
b) If a Scavenge fire does occur what action should be taken? Discuss the use of CO2 and dry powder for extinguishing such a fire and describe a fixed installation for applying one of these substances. (10)
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