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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The liquid used in manometers should have

Low surface tension
High surface tension
Low density
High density

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Hydraulics and Fluid Mechanics in ME
The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is

ρ ω2 r2/4
ρ ω2 r2/2
2ρ ω2 r2
ρ ω2 r2

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Hydraulics and Fluid Mechanics in ME
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

Efficiency will be low
Cavitation will be formed
Excessive power will be consumed
No flow will take place

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Hydraulics and Fluid Mechanics in ME
Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called

adhesion
viscosity
cohesion
compressibility

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Hydraulics and Fluid Mechanics in ME
Which of the following is used to measure the discharge ?

venturimeter
current meter
pitot tube
hotwire anemometer

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Hydraulics and Fluid Mechanics in ME
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/g) × sin θ
(waV/2g) × sin θ
(waV²/2g) × sin 2θ
(waV²/g) × sin θ

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