Hydraulics and Fluid Mechanics in ME - Mechanical Engineering Questions and Answers

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The tendency of a liquid surface to contract is due to the following property

A.

Cohesion

B.

Adhesion

C.

Viscosity

D.

Surface tension

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The pressure measured with the help of a Piezometer tube is in

A.

N/mm²

B.

N/m²

C.

Head of liquid

D.

All of these

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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 empty the tank completely will be

A.

(2A√H₁)/(Cd × a√2g)

B.

(2AH₁)/(Cd × a√2g)

C.

(2AH₁3/2)/(Cd × a√2g)

D.

(2AH₁²)/(Cd × a√2g)

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According to equation of continuity,

A.

w1a1 = w2a2

B.

w1v1 = w2v2

C.

a1v1 = a2v2

D.

a1/v1 = a2/v2

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The vapour pressure over the concave surface is

A.

Less man the vapour pressure over the plane surface

B.

Equal to the vapour pressure over the plane surface

C.

Greater than the vapour pressure over the plane surface

D.

Zero

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The equation of continuity holds good when the flow

A.

Is steady

B.

Is one dimensional

C.

Velocity is uniform at all the cross sections

D.

All of the above

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Pitot tube is used for measurement of

A.

Pressure

B.

Flow

C.

Velocity

D.

Discharge

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According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C = Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed)

A.

A × √(m × i)

B.

C × √(m × i)

C.

AC × √(m × i)

D.

mi × √(A × C)