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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

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

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Hydraulics and Fluid Mechanics in ME
If the surface of liquid is convex, men

Cohesion pressure is increased
There is no cohesion pressure
Cohesion pressure is negligible
Cohesion pressure is decreased

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Hydraulics and Fluid Mechanics in ME
In axial flow fans and turbines, fluid enters and leaves as follows

Axially, axially
Radially, radially
Axially, radially
Radially, axially

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

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

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

μπ²NR/60t
μπ²NR⁴/60t
μπ²NR²/60t
μπ²NR³/60t

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Hydraulics and Fluid Mechanics in ME
The unit of dynamic viscosity in S.I. units is

N-s/m²
Poise
N-m/s²
Stoke

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