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What is the value of θ in a most economical circular section in case of maximum discharge?

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+1 vote
in Fluid Mechanics by (118k points)
What is the value of θ in a most economical circular section in case of maximum discharge?

(a) 150°

(b) 152°

(c) 154°

(d) 156°

I had been asked this question by my school principal while I was bunking the class.

I'd like to ask this question from Most Economic Circular Section topic in division Flow in Open Channels of Fluid Mechanics

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The correct answer is (c) 154°

To explain I would say: The equation in case for maximum discharge is,

4Ɵ – 6θ cos⁡ 2θ + sin ⁡2θ = 0 where θ = 154°.

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