This set of Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Most Economic Circular Section – 1”.

1. Estimate the wetted perimeter of a circular channel having radius R and depth d, if the angle subtended at the centre is Ɵ.

a) ^{RƟ}⁄_{2}

b) RƟ

c) 2RƟ

d) 3RƟ

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2. Calculate the wetted area of a circular channel having depth d and radius R.

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3. Determine the hydraulic radius of a circular section having depth d and radius R.

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4. A circular channel section has water at a depth of 2m and the radius of the section is 4m, calculate the wetted area of the channel.

a) 6.87m^{2}

b) 7.87m^{2}

c) 8.87m^{2}

d) 9.87m^{2}

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5. Calculate the wetted perimeter of a circular channel if the depth of water is 2m and radius is 5m.

a) 9.27m

b) 10.27m

c) 11.27m

d) 12.27m

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6. Calculate the hydraulic radius of a circular channel having depth 6m and radius 4m.

a) 0.41m

b) 1.41m

c) 2.41m

d) 3.41m

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7. Calculate the discharge through a circular channel section if the depth is 5m, radius of the circular section is 3m and the bed slope is 1 in 1000. Given: C = 50.

a) 25.74 m^{3}/s

b) 26.74 m^{3}/s

c) 27.74 m^{3}/s

d) 28.74 m^{3}/s

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8. Estimate the discharge through a circular channel section having radius 4m and depth 3m if the channel bed slope is 1 in 2000. Given: n = 0.015.

a) 15.8 m^{3}/s

b) 16.8 m^{3}/s

c) 17.8 m^{3}/s

d) 18.8 m^{3}/s

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9. Calculate the hydraulic radius of a circular channel if the radius is 6m and the central angle is 70°.

a) 0.58m

b) 0.68m

c) 0.78m

d) 0.88m

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10. The hydraulic radius of a circular channel section is 0.33m, calculate the radius of the channel if the central angle is 60°.

a) 2m

b) 3m

c) 4m

d) 5m

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11. The discharge through a circular channel section is 14.67m^{3}/s and the velocity of flow is 1.47m/s, calculate the radius of the section if Ɵ = 75°.

a) 2m

b) 3m

c) 4m

d) 5m

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**Sanfoundry Global Education & Learning Series – Fluid Mechanics.**

To practice all areas of Fluid Mechanics, __here is complete set of 1000+ Multiple Choice Questions and Answers__.