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4

The Francis formula for the discharge over Cipoletti weir is

A. 1.84 LH1/2

B. 1.84 LH

C. 1.84 LH3/2

D. 1.84 LH5/2

Correct Answer :

C. 1.84 LH3/2


Related Questions

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4

The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as

A. One dimensional flow

B. Uniform flow

C. Steady flow

D. Turbulent flow

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4

Flow of water in a pipe about 3 metres in diameter can be measured by

A. Orifice plate

B. Venturimeter

C. Rotameter

D. Pitot tube

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4

An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch.

A. 1 %

B. 1.5 %

C. 2 %

D. 2.5 %

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4

At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

A. Minimum

B. Maximum

C. Zero

D. Could be any value

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4

The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

A. Half the depth

B. Half the breadth

C. Twice the depth

D. Twice the breadth

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4

The property by virtue of which a liquid opposes relative motion between its different layers is called

A. Surface tension

B. Coefficient of viscosity

C. Viscosity

D. Osmosis

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4

Rotameter is a device used to measure

A. Absolute pressure

B. Velocity of fluid

C. Flow

D. Rotation

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4

The unit of kinematic viscosity in S. I. units is

A. N-m/s

B. N-s/m2

C. m2/s

D. N-m

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4

The meatcentric height is the distance between the

A. Centre of gravity of the floating body and the centre of buoyancy

B. Centre of gravity of the floating body and the metacentre

C. Metacentre and centre of buoyancy

D. Original centre of buoyancy and new centre of buoyancy

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4

When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as

A. Centre of pressure

B. Centre of gravity

C. Centre of buoyancy

D. Metacentre

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4

A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a

A. Notch

B. Weir

C. Mouthpiece

D. Nozzle

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4

The specific weight of water in S.I. units is taken as

A. 9.81 kN/m3

B. 9.81 × 103 N/m3

C. 9.81 × 10-6 N/mm3

D. Any one of these

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4

The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

A. 1/2 × depth

B. 1/2 × breadth

C. 1/2 × sloping side

D. 1/4 × (depth + breadth)

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4

The highest efficiency is obtained with a channel of __________ section.

A. Circular

B. Square

C. Rectangular

D. Trapezoidal

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4

The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to

A. 2100

B. 2700

C. 10,000

D. 21,000

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4

During the opening of a valve in a pipe line, the flow is

A. Steady

B. Unsteady

C. Uniform

D. Laminar

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4

A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The unit of dynamic viscosity in S.I. units is

A. N-m/s2

B. N-s/m2

C. Poise

D. Stoke

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4

A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be

A. (2A√H₁)/(Cd × a√2g)

B. (2AH₁)/(Cd × a√2g)

C. (2AH₁3/2)/(Cd × a√2g)

D. (2AH₁²)/(Cd × a√2g)

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4

The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called

A. Density of liquid

B. Specific gravity of liquid

C. Compressibility of liquid

D. Surface tension of liquid

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4

The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

A. wA

B. wx

C. wAx

D. wA/x

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4

The intensity of pressure at any point, in a liquid, is __________ to the depth of liquid from the surface.

A. Equal

B. Directly proportional

C. Inversely proportional

D. None of these

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4

A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

A. Increase

B. Decrease

C. Remain same

D. Increase/decrease depending on depth of immersion

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4

If the surface of liquid is convex, men

A. Cohesion pressure is negligible

B. Cohesion pressure is decreased

C. Cohesion pressure is increased

D. There is no cohesion pressure

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4

Fluid is a substance that

A. Cannot be subjected to shear forces

B. Always expands until it fills any container

C. Has the same shear stress at a point regardless of its motion

D. Cannot remain at rest under action of any shear force

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4

The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

A. 0.34 times

B. 0.67 times

C. 0.81 times

D. 0.95 times

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4

In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be

A. Running full

B. Running free

C. Partially running full

D. Partially running free

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4

One stoke is equal to

A. 10-2 m2/s

B. 10-3 m2/s

C. 10-4 m2/s

D. 10-6 m2/s

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4

According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)

A. flv²/2gd

B. flv²/gd

C. 3flv²/2gd

D. 4flv²/2gd

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4

A structure used to dam up a stream or river over which the water flows is called

A. Orifice

B. Notch

C. Weir

D. Dam