Class 4 (4th Engineer) MEKM 📅 Mar 2025

Exam Question

Efficient smooth combustion depends upon some or all of the following:

(a) A sufficiently high temperature to effect ignition

(b) A large delay period or ignition lag

(d) A large and rapid rate of pressure rise during the second stage of combustion

(e) Rapid heat losses to the walls

Give the correct answer with adequate justification. (16)

Reference Answer

Efficient and smooth combustion in a marine diesel engine is paramount for achieving optimal power output, fuel efficiency, and long-term mechanical reliability. It involves the complete and controlled release of chemical energy from the fuel at the most effective point in the engine cycle. The following is a detailed analysis of the provided statements.
### Analysis of Combustion Factors
#### (a) A sufficiently high temperature to effect ignition
**Verdict: CORRECT**

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