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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

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

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Hydraulics and Fluid Mechanics in ME
Motion of a liquid in a volute casing of a centrifugal pump is an example of

Spiral vortex flow
Radial
Rotational flow
Forced spiral vortex flow

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Hydraulics and Fluid Mechanics in ME
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

0.375 v₂²/2g
0.5 v₁²/2g
v₂²/2g
v₁²/2g

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Hydraulics and Fluid Mechanics in ME
Ratio of inertia force to surface Jension is known as

Mach number
Reynold’s number
Weber’s number
Froude number

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Hydraulics and Fluid Mechanics in ME
The pressure at a point 4 m below the free surface of water is

29.24 kPa
19.24 kPa
39.24 kPa
49.24 kPa

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Hydraulics and Fluid Mechanics in ME
The loss of pressure head in case of laminar flow is proportional to

(Velocity)2
(Velocity)4
Velocity
(Velocity)3

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