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In some small engines, the cylinder walls are plated with __________ to reduce wall wear and increase the service life.

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In some small engines, the cylinder walls are plated with __________ to reduce wall wear and increase the service life.

(a) grey cast iron

(b) steel sleeves

(c) chromium

(d) nickel

I had been asked this question in examination.

My doubt is from Cylinder Block topic in chapter Engine Construction & Wheel Assembly of Automobile Engineering

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Correct option is (c) chromium

The explanation is: Chromium a very hard metal with high coefficient of thermal expansion so used to reduce wall wear and to promote service life.

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