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Which outcome accelerates in a Diesel engine when jacket coolant temperature severely drops during operation?

A)Thermal shock induced cylinder cracking
B)Increased unburnt hydrocarbon emissions
C)Enhanced lubricating oil film integrity
D)Reduced nitrogen oxides formation rate

💡 Explanation

If the jacket coolant temperature suddenly drops, thermal shock may occur because rapid cooling causes uneven contraction leading to stress concentration exceeding material strength, therefore cylinder cracking emerges, rather than emissions reduction which is linked typically to higher temperatures.

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