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In air-cooled small engines ______ are provided on the outer perimeter of the engine?

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in Automotive Engine Design by (137k points)
In air-cooled small engines   ______ are provided on the outer perimeter of the engine?

(a) Flanges

(b) Fins

(c) Holes

(d) Treads

The question was asked in examination.

I'm obligated to ask this question of Methods of Cooling in portion Cooling System of Automotive Engine Design

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The correct answer is (b) Fins

Easiest explanation: Fins are present on the outer perimeter of the engine as they increase the surface area of contact metal with the air by doing this heat is transferred from the engine through Fins, into the atmosphere thus achieving effective cooling is obtained.

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