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Which part of the engine does not rapidly wear due to impurities like dust?

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in Automotive Engine Design by (137k points)
Which part of the engine does not rapidly wear due to impurities like dust?

(a) Cylinder

(b) Pistons

(c) Rings

(d) Camshaft

I have been asked this question in an interview for internship.

This intriguing question comes from Petrol Engine Fuel Supply System topic in division Petrol Engine Fuel Supply System of Automotive Engine Design

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The correct option is (d) Camshaft

Easy explanation: The impurities like dust in the air cause very rapid wear of the engine, particularly the cylinder, piston, rings, valves, and guides. Whereas the camshaft is not part of the cylinder as the camshaft just helps in the valve timing.

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