HYDRAULICS AND FLUID MECHANICS IN ME QUIZ

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

(IG/Ax̅) + x̅

(Ax̅/IG) + x̅

(IG/x̅) - Ax̅

(IG/Ax̅) - x̅

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In an immersed body, centre of pressure is

Below be centre of gravity

Could be above or below e.g. depending on density of body and liquid

Above the centre of gravity

At the centre of gravity

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If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be

unpredictable

from reservoir C to reservoirs A and B

from reservoir A to reservoirs B and C

from reservoir B to reservoirs C and A

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The process of diffusion of one liquid into the other through a semi-permeable membrane is called

cohesion

surface tension

osmosis

viscosity

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A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is

33.3 kN

None of these

3.53 kN

35.3 kN

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Which of the following is used to measure the discharge ?

hotwire anemometer

pitot tube

venturimeter

current meter

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The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is

(waV/2g) × sin θ

(waV²/2g) × sin 2θ

(waV/g) × sin θ

(waV²/g) × sin θ

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Pascal-second is the unit of

surface tension

pressure

dynamic viscosity

kinematic viscosity

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The ratio of the inertia force to the elastic force is called

Weber's number

Mach number

Reynold's number

Froude's number

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An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.

More than three times

Less than twice

More than twice

Less than three times

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