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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
The Prartdtl mixing length is

independent of shear stress
None of these
zero at the pipe wall
maximum at the pipe wall

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Hydraulics & Fluid Mechanics
Two pipe systems are said to be equivalent when

friction factor and length are same in two systems
length of pipe and discharge are same in two systems
head loss and discharge are same in two systems
length and diameter are same in two systems

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Hydraulics & Fluid Mechanics
Which of the following instrument can be used for measuring speed of an aeroplane

Venturimeter
Orifice plate
pitot tube
rotameter

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Hydraulics & Fluid Mechanics
Ay between two stream lines represents

velocity
head
pressure
discharge

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Hydraulics & Fluid Mechanics
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)

3/4 R
2/3 R
1/3 R
1/2 R

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Hydraulics & Fluid Mechanics
Uniform flow occurs when

size and cross section change uniformly along length
size and shape of the cross section in a particular length remain constant
the flow is streamline
the flow is steady

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