The power developed and the exhaust gas temperature of a diesel engine, compared to a spark-ignition engine of the same size running at the same speed, respectively are:
Options:
(A) higher and lower
(B) higher and higher
(C) lower and higher
(D) lower and lower
Official Answer Key:
D
Step-by-Step Solution & Explanation
A CI (diesel) engine of equal size runs on a much higher compression ratio and leaner overall mixture, is speed-limited compared to SI engines, and rejects proportionally less heat to exhaust owing to higher thermal efficiency — so, for equal size/speed, diesel gives lower power output and a lower exhaust gas temperature than a petrol (SI) engine. Answer: D.
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