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What is the percentage of heat transfer rate in a hybrid liner?

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in Automotive Engine Design by (137k points)
What is the percentage of heat transfer rate in a hybrid liner?

(a) 50%

(b) 90%

(c) 30%

(d) 70%

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I would like to ask this question from Engine Components in chapter Basic Engine Components of Automotive Engine Design

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Correct answer is (c) 30%

Explanation: The use of hybrid liners results in upto 30% higher heat transfer rates, which can reduce cylinder wall temperature by upto 40 degrees centigrade. The distortion of loads is claimed to be upto three times better, which results in upto 40% reduction in oil consumption.

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