Mechanical Engineering · all questions

Hydraulics And Fluid Mechanics
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Q221

Coefficient of resistance is the ratio of

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Q222

The mercury does not wet the glass. This is due to the property of the liquid known as

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Q223

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)

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Q224

The depth of centre of pressure (h) for a vertically immersed surface from the liquid surface is given by (where

I_{G}

= Moment of inertia of the immersed surface about horizontal axis through its centre of gravity, A = Area of immersed surface and x = Depth of centre of gravity of the immersed surface from the liquid surface)

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Q225

A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface.

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Q226

The discharge through a wholly drowned orifice is given by (where H₁ = Height of water (on the upstream side) above the top of the orifice, H₂ = Height of water (on the downstream side) above the bottom of the orifice and H = Difference between two water levels on either side of the orifice)

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Q227

The discharge through a small rectangular orifice is given by (where C_d = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)

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Q228

One cubic metre of water weighs

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Q229

According to fan laws, for fans having constant wheel diameter, the pressure varies

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Q230

A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

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Q231

The specific speed of turbine is defined as the speed of a unit

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Q232

The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece and H = Height of liquid above the mouthpiece)

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Q233

When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece and H = Height of liquid above the mouthpiece)

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Q234

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.

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Q235

A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.

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Q236

Braking jet in an impulse turbine is used

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Q237

Rotameter is a device used to measure

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Q238

In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

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Q239

In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

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Q240

Choose the wrong statement

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