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Rough interior surfaces of the manifold runners will increase what to the mixture flow?

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in Automotive Engine Design by (137k points)
Rough interior surfaces of the manifold runners will increase what to the mixture flow?

(a) liquidity

(b) Velocity

(c) Smoothness

(d) Resistance

I have been asked this question in examination.

The question is from Intake System topic in division Fuels, Intake System & Leakage Preventers of Automotive Engine Design

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The correct choice is (d) Resistance

The best I can explain: Rough interior surfaces of the manifold runners will increase resistance to the mixture flow and the surface of the exhaust manifold is made smooth to minimize the restriction of exhaust gas.

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