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You need to login to ask any Questions from chapter orifices-mouthpieces-notches-and-weirs of Fluid-Mechanics-Mcqs

Chapter:

orifices-mouthpieces-notches-and-weirs

1. For discharge over ogee weir discharge is directly proportional to length but for discharge over narrow crested weir it is inversely proportional to length.

True False

False

For both weirs it?s same.

Hint Answer

2. Trapezoidal weir has anor popular name. What is it?

Cipolletti weir Hagen Poiseuille’s weir Reynold’s weir Euler’s weir

Cipolletti weir

Trapezoidal weir is also called Cipolletti weir.

Hint Answer

3. We need to obligatorily have ventilation in triangular notch.

True False

False

We need not obligatorily have ventilation in triangular notch.

Hint Answer

4. Which of following is not a way of classifying notches or weirs?

Based on the shape of opening Based on the effect of the sides on the nappe Based on the shape of the crest Based on the effect of the sides on the crest

Based on the effect of the sides on the crest

There is no such way of classification.

Hint Answer

5. A notch is a device used to measure turbulence of flowing liquid directly.

True False

False

A notch is a device used to measure flow rate of flowing liquid, directly.

Hint Answer

6. The head of water over a rectangular weir is 26 cm. The length of crest of weir end contraction suppressed is 1.25 m. Find discharge using Francis formula.

0.304 m³/s 0.502 m³/s 0.350 m³/s 0.625 m³/s

0.304 m³/s

Q = 1.84*L*H^1.5
= 0.304 m³/s.

Hint Answer

7. In discharge of water over Ogee weir, discharge is directly proportional to first power of length.

True False

True

This is as per empirical relation.

Hint Answer

8. Find discharge of water flowing over a rectangular notch of 1.3 m length when constant head over notch is 255 mm. Take Cd = .62

400 lit/s 465 lit/s 385 lit/s 575 lit/s

400 lit/s

Q = 2/3 * L * ?2g * H^1.5
= .67 * 1.3 * ?19.62 * .255^1.5
= .385 m³/min.

Hint Answer

9. In Francis formula, effective length is –

L-0.2H L-0.4H L-0.3H L-0.1H

L-0.2H

In Francis formula, effective length is L-0.2H.

Hint Answer

10. The head of water over a rectangular weir is 28 cm. The length of crest of weir end contraction suppressed is 1.27 m. Find discharge using Francis formula.

0.346 m³/s 0.556 m³/s 0.788 m³/s 0.225 m³/s

0.346 m³/s

Q = m * L * (2*g)^0.5 * H^1.5
m = ? * Cd
= 0.405 + 0.003/H
= 0.405 + 0.003/0.28
Q = 0.346 m³/s.

Hint Answer

Nexttt

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Properties of Fluids

Properties of Fluids

Pressure and Its Measurement

Pressure and Its Measurement

Hydrostatic Forces on Surfaces

Hydrostatic Forces on Surfaces

Buoyancy and Floatation

Buoyancy and Floatation

Kinematics of Flow and Ideal Flow

Kinematics of Flow and Ideal Flow

Fluid Dynamics

Orifices, Mouthpieces, Notches and Weirs

Orifices, Mouthpieces, Notches and Weirs

Viscous Flow & Turbulent Flow

Viscous Flow & Turbulent Flow

Flow Through Pipes

Flow Through Pipes

Indicator Diagrams

Indicator Diagrams

Dimensional and Model Analysis

Dimensional and Model Analysis

Boundary Layer Flow & Forces on Sub-merged Bodies

Boundary Layer Flow & Forces on Sub-merged Bodies

Compressible Flow

Compressible Flow

Flow in Open Channels

Flow in Open Channels

Non Uniform Flow in Channels

Non Uniform Flow in Channels

Impact of Jets and Jet Propulsion

Impact of Jets and Jet Propulsion

Topics

This Chapter orifices-mouthpieces-notches-and-weirs consists of the following topics

Orifices

Mouthpieces

Notches and Weirs

For discharge over ogee weir discharge is directly proportional to length but for discharge over narrow crested weir it is inversely proportional to length.

Trapezoidal weir has anor popular name. What is it?

We need to obligatorily have ventilation in triangular notch.

Which of following is not a way of classifying notches or weirs?

A notch is a device used to measure turbulence of flowing liquid directly.

The head of water over a rectangular weir is 26 cm. The length of crest of weir end contraction suppressed is 1.25 m. Find discharge using Francis formula.

In discharge of water over Ogee weir, discharge is directly proportional to first power of length.

Find discharge of water flowing over a rectangular notch of 1.3 m length when constant head over notch is 255 mm. Take Cd = .62

In Francis formula, effective length is –

The head of water over a rectangular weir is 28 cm. The length of crest of weir end contraction suppressed is 1.27 m. Find discharge using Francis formula.

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