Q:
A diesel engine is usually more efficient than a spark ignition engine because ___________
| A) Diesel being a heavier hydrocarbon, release more heat per kg than gasoline
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B) The air standard efficiency of diesel engine is higher than the otto cycle, at a fixed compression ratio
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| C) The compression ratio of diesel engine is higher than petrol engine
| D) Self ignition temperature of diesel engine is higher than that of gasoline
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Explanation
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