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4

According to Bernoulli's equation

A. Z + p/w + v²/2g = constant

B. Z + p/w - v²/2g = constant

C. Z - p/w + v²/2g = constant

D. Z - p/w - v²/2g = constant

Correct Answer :

A. Z + p/w + v²/2g = constant


Related Questions

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4

The bulk modulus of elasticity with increase in pressure

A. Increases

B. Decreases

C. Remain constant

D. Increases first up to certain limit and then decreases

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4

A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

A. 14π R1/2/15Cd × a √(2g)

B. 14π R3/2/15Cd × a √(2g)

C. 14π R5/2/15Cd × a √(2g)

D. 14π R7/2/15Cd × a √(2g)

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4

Rain drops are spherical because of

A. Viscosity

B. Air resistance

C. Surface tension forces

D. Atmospheric pressure

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4

When a liquid is flowing through a pipe, the velocity of the liquid is

A. Maximum at the centre and minimum near the walls

B. Minimum at the centre and maximum near the walls

C. Zero at the centre and maximum near the walls

D. Maximum at the centre and zero near the walls

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4

A pitot tube is used to measure the

A. Velocity of flow at the required point in a pipe

B. Pressure difference between two points in a pipe

C. Total pressure of liquid flowing in a pipe

D. Discharge through a pipe

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4

The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream

A. Keeps on increasing

B. Keeps on decreasing

C. Remain constant

D. May increase/decrease

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4

According to Bazin's formula, the discharge over a rectangular weir is mL2g x H3/2where m is equal to

A. 0.405 + (0.003/H)

B. 0.003 + (0.405/H)

C. 0.405 + (H/0.003)

D. 0.003 + (H/0.405)

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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

Stoke is the unit of

A. Kinematic viscosity in C. G. S. units

B. Kinematic viscosity in M. K. S. units

C. Dynamic viscosity in M. K. S. units

D. Dynamic viscosity in S. I. units

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4

Unit of surface tension is

A. Energy/unit area

B. Velocity/unit area

C. Both of the above

D. It has no units

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4

The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)

A. 2gH

B. H × √(2g)

C. 2g × √H

D. √(2gh)

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4

Which of the following instruments is used to measure flow on the application of Bernoulli's theorem?

A. Venturimeter

B. Orifice plate

C. Nozzle

D. All of the above

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4

Choose the wrong statement

A. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force

B. Viscosity is due primarily to interaction between fluid molecules

C. Viscosity of liquids decreases with increase in temperature

D. Viscosity of liquids is appreciably affected by change in pressure

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4

The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the

A. Pressure head

B. Velocity head

C. Pressure head + velocity head

D. Pressure head - velocity head

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4

The factional resistance of a pipe varies approximately with __________ of the liquid.

A. Pressure

B. Velocity

C. Square of velocity

D. Cube of velocity

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4

The total energy line lies over the centre line of the pipe by an amount equal to

A. Pressure head

B. Velocity head

C. Pressure head + velocity head

D. Pressure head - velocity head

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4

The critical depth meter is used to measure

A. Velocity of flow in an open channel

B. Depth of flow in an open channel

C. Hydraulic jump

D. Depth of channel

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4

Viscosity of water in comparison to mercury is

A. Higher

B. Lower

C. Same

D. Higher/lower depending on temperature

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4

For pipes, laminar flow occurs when Reynolds number is

A. Less than 2000

B. Between 2000 and 4000

C. More than 4000

D. Less than 4000

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4

The loss of pressure head in case of laminar flow is proportional to

A. Velocity

B. (Velocity)2

C. (Velocity)3

D. (Velocity)4

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4

The ratio of absolute viscosity to mass density is known as

A. Specific viscosity

B. Viscosity index

C. Kinematic viscosity

D. Coefficient of viscosity

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4

The flow of water through the hole in the bottom of a wash basin is an example of

A. Steady flow

B. Uniform flow

C. Free vortex

D. Forced vortex

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4

Coefficient of resistance is the ratio of

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

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

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

D. Actual discharge through an orifice to the theoretical discharge

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4

The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

A. μπ²NR/60t

B. μπ²NR²/60t

C. μπ²NR³/60t

D. μπ²NR⁴/60t

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4

A metal with specific gravity of a floating in a fluid of same specific gravity a will

A. Sink to bottom

B. Float over fluid

C. Partly immersed

D. Be fully immersed with top surface at fluid surface

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4

In open channels, the specific energy is the

A. Total energy per unit discharge

B. Total energy measured with respect to the datum passing through the bottom of the channel

C. Total energy measured above the horizontal datum

D. Kinetic energy plotted above the free surface of water

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4

A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is

A. 1

B. 5

C. 7

D. 6

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4

Buoyant force is

A. The resultant force acting on a floating body

B. The resultant force on a body due to the fluid surrounding it

C. Equal to the volume of liquid displaced

D. The force necessary to maintain equilibrium of a submerged body

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4

The upper surface of a weir over which water flows is known is

A. Crest

B. Nappy

C. Sill

D. Weir top