# Mechanical Engineering - Hydraulics and Fluid Mechanics

### Exercise :: Hydraulics and Fluid Mechanics - Section 6

21.

The depth of centre of pressure (h) for a vertically immersed surface from the liquid surface is given by (where IG = Moment of inertia of the immersed surface about horizontal axis through its centre of gravity, A = Area of immersed surface, and x = Depth of centre of gravity of the immersed surface from the liquid surface)

 A. B. C. D. Answer: Option D

Explanation:

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22.

The velocity at which the turbulent flow starts is known as higher critical velocity.

 A. Yes B. No

Answer: Option A

Explanation:

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23.

According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)

 A. Cd(L - nH)2gH B. Cd(L - 0.1nH)2gH3/2 C. Cd(L - nH)2gH2 D. Cd(L - 0.2nH)2gH5/2

Answer: Option B

Explanation:

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24.

The specific weight is also known as weight density.

 A. Correct B. Incorrect

Answer: Option A

Explanation:

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25.

In a lockgate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock)

 A. B. C. P / 2sinα D. Answer: Option C

Explanation:

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