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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 bring the liquid level from H1 to H2 will be

A. 2A × √H₁/Cd × a × √(2g)

B. 2A × √H₂/Cd × a × √(2g)

C. 2A × (√H₁ - √H₂)/Cd × a × √(2g)

D. 2A × (√H3/2 - √H3/2)/Cd × a × √(2g)

Correct Answer :

C. 2A × (√H₁ - √H₂)/Cd × a × √(2g)


Related Questions

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4

In a depressed nappe

A. The pressure below the nappe is atmospheric

B. The pressure below the nappe is negative

C. The pressure above the nappe is atmospheric

D. The pressure above the nappe is negative

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4

The Cipoletti weir is a __________ weir.

A. Rectangular

B. Triangular

C. Trapezoidal

D. Circular

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4

When a body floating in a liquid, is displaced slightly, it oscillates about

A. C.G. of body

B. Center of pressure

C. Center of buoyancy

D. Metacentre

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4

A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury?

A. The metal piece will simply float over the mercury

B. The metal piece will be immersed in mercury by half

C. Whole of the metal piece will be immersed with its top surface just at mercury level

D. Metal piece will sink to the bottom

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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

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4

The coefficient of discharge in case of internal mouthpiece is __________ that of external mouthpiece.

A. Less than

B. More than

C. Equal to

D. None of these

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4

If the depth of water in an open channel is greater than the critical depth, the flow is called

A. Critical flow

B. Turbulent flow

C. Tranquil flow

D. Torrential flow

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4

The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is

A. ρ ω2 r2

B. 2ρ ω2 r2

C. ρ ω2 r2/2

D. ρ ω2 r2/4

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4

The height of a water column equivalent to a pressure of 0.15 MPa is

A. 15.3 m

B. 25.3 m

C. 35.3 m

D. 45.3 m

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4

The top of the weir over which the water flows is known as

A. Sill or crest

B. Nappe or vein

C. Orifice

D. None of these

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4

A fluid whose viscosity does not change with the rate of deformation or shear strain is known as

A. Real fluid

B. Ideal fluid

C. Newtonian fluid

D. Non-Newtonian fluid

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4

The coefficient of viscosity may be determined by

A. Capillary tube method

B. Orifice type viscometer

C. Rotating cylinder method

D. All of these

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4

The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

A. v₁²/2g

B. v₂²/2g

C. 0.5 v₁²/2g

D. 0.375 v₂²/2g

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4

Metacentric height is given as the distance between

A. The center of gravity of the body and the metacentre

B. The center of gravity of the body and the center of buoyancy

C. The center of gravity of the body and the center of pressure

D. Center of buoyancy and metacentre

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4

Bernoulli equation deals with the law of conservation of

A. Mass

B. Momentum

C. Energy

D. Work

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4

When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid

A. Remains horizontal

B. Becomes curved

C. Falls on the front end

D. Falls on the back end

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4

A point, in a compressible flow where the velocity of fluid is zero, is called

A. Critical point

B. Vena contracta

C. Stagnation point

D. None of these

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4

The discharge in an open channel corresponding to critical depth is

A. Zero

B. Minimum

C. Maximum

D. None of these

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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

Coefficient of contraction is the ratio of

A. Actual velocity of jet at vena contracta to the theoretical velocity

B. Loss of head in the orifice to the head of water available at the exit of the orifice

C. Loss of head in the orifice to the head of water available at the exit of the orifice

D. Area of jet at vena-contracta to the area of orifice

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4

One litre of water occupies a volume of

A. 100 cm3

B. 250 cm3

C. 500 cm3

D. 1000 cm3

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4

The stability of a dam is checked for

A. Tension at the base

B. Overturning of the wall or dam

C. Sliding of the wall or dam

D. All of these

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4

The dynamic viscosity of gases __________ with rise in temperature.

A. Remain unaffected

B. Increases

C. Decreases

D. None of these

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4

Practical fluids

A. Are viscous

B. Possess surface tension

C. Are compressible

D. Possess all the above properties

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4

The pressure at a point in a fluid will not be same in all the directions when the fluid is

A. Moving

B. Viscous

C. Viscous and static

D. Viscous and moving

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4

The Euler's equation for the motion of liquids is based upon the assumption that

A. The fluid is non - viscous, homogeneous and incompressible

B. The velocity of flow is uniform over the section

C. The flow is continuous, steady and along the stream line

D. All of the above

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4

The intensity of pressure at any point, in a liquid, is

A. Directly proportional to the area of the vessel containing liquid

B. Directly proportional to the depth of liquid from the surface

C. Directly proportional to the length of the vessel containing liquid

D. Inversely proportional to the depth of liquid from the surface

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4

A structure, whose width is __________ the width of the channel, is called a flumed structure.

A. Less than

B. More than

C. Equal

D. None of these

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4

The coefficient of venturi-flume, generally, lies between

A. 0.3 to 0.45

B. 0.50 to 0.75

C. 0.75 to 0.95

D. 0.95 to 1.0

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4

The dynamic viscosity of the liquid __________ with rise in temperature.

A. Remain unaffected

B. Increases

C. Decreases

D. None of these