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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For pipes, turbulent flow occurs when Reynolds number is

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

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Hydraulics and Fluid Mechanics in ME
Low specific speed of turbine implies it is

Propeller turbine
Francis turbine
Impulse turbine
Any one of the above

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Hydraulics and Fluid Mechanics in ME
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar)

0.20 cm
0.40 cm
0.10 cm
0.05 cm

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Hydraulics and Fluid Mechanics in ME
The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is

0.116 stoke
0.611 stoke
0.0116 stoke
0.0611 stoke

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Hydraulics and Fluid Mechanics in ME
The units of kinematic viscosity are

kg sec/meter
newton-sec per meter
metres² per sec
newton-sec per meter

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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

compressibility
viscosity
adhesion
cohesion

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