# Civil Engineering - Hydraulics

### Exercise :: Hydraulics - Section 3

36.

Most economical section of a triangular channel, is

 A. equilateral triangle B. right angled triangle C. isosceles triangle with 45° vertex angle D. right angled triangle with equal sides.

Answer: Option D

Explanation:

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37.

In an open tube, free surface of mercury remains

 A. horizontal B. curved upwards C. curved downwards D. none of these.

Answer: Option C

Explanation:

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38.

The equation for the viscosity, is suggested

 A. Bernoulli B. Newton C. Chezy D. Bezin E. Helmholtz.

Answer: Option B

Explanation:

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39.

The value of momentum correction factor (β) for a laminar flow through a circular pipe, is

 A. 1/2 B. 2/3 C. 3/4 D. 4/3 E. 3/2

Answer: Option D

Explanation:

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40.

Manometers are used to measure

 A. pressure in water channels, pipes etc. B. difference in pressure at two points C. atmospheric pressure D. very low pressure.

Answer: Option A

Explanation:

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