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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For pipes, laminar flow occurs when Roynolds number is

between 2000 and 4000
less than 2000
less than 4000
more than 4000

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Hydraulics and Fluid Mechanics in ME
The depth of the bucket for a Pelton wheel is generally _________ the diameter of jet.

1.2 times
Equal to
Double
1.8 times

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Hydraulics and Fluid Mechanics in ME
The stress-strain relation of the newtoneon fluid is

parabolic
linear
hyperbolic
inverse type

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Hydraulics and Fluid Mechanics in ME
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

14π R1/2/15Cd × a √(2g)
14π R3/2/15Cd × a √(2g)
14π R5/2/15Cd × a √(2g)
14π R7/2/15Cd × a √(2g)

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Hydraulics and Fluid Mechanics in ME
According to fan laws, for fans having constant wheel diameter, the pressure varies

Square root of fan speed
Cube of fan speed
Square of fan speed
Directly as fan speed

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Hydraulics and Fluid Mechanics in ME
For starting an axial flow pump, its delivery valve should be

Depends on starting condition and flow desired
Open
Could be either open or closed
Closed

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