Mechanical Engineering · all questions

Hydraulics And Fluid Mechanics
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Q261

Which of the following statement is correct?

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Q262

Which of the following statement is correct?

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Q263

The length AB of a pipe ABC in which the liquid is flowing has diameter (d₁) and is suddenly enlarged to diameter (d₂) at B which is constant for the length BC. The loss of head due to sudden enlargement is

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Q264

In centrifugal pumps, maximum efficiency is obtained when the blades are

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Q265

The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

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Q266

Power required (in watts) to drive a centrifugal pump is (where H_m = Manometric head in metres, w = Specific weight in N/m³, Q = Discharge of the pump in m³/s and

η_{o}

= Overall efficiency of the pump)

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Q267

According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)

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Q268

The length of a liquid stream while flowing over a weir __________ at the ends of the sill.

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Q269

The discharge through a large rectangular orifice is given by (where H₁ = Height of the liquid above the top of the orifice, H₂ = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice and C_d = Coefficient of discharge)

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Q270

The depth of center of pressure of an immersed surface, inclined at an angle

θ

with the liquid surface lies at a distance equal to __________ the center of gravity.

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Q271

The centre of pressure for a vertically immersed surface lies at a distance equal to __________ the centre of gravity.

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Q272

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

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Q273

According to Bazin's formula, the discharge over a rectangular weir is

mL 2 g \times H^{\frac{3}{2}},

where m is equal to

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Q274

In an isothermal atmosphere, the pressure

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Q275

Rain drops are spherical because of

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Q276

Surface energy per unit area of a surface is numerically equal to

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Q277

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

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Q278

In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be

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Q279

In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

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Q280

To avoid an interruption in the flow of a siphon, an air vessel is provided

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