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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

(1 - sin φ)/2
(1 + cos φ)/2
(1 + sin φ)/2
(1 - cos φ)/2

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Hydraulics and Fluid Mechanics in ME
When the Mach number is more than 6, the flow is called

Sub-sonic flow
Super-sonic flow
Hyper-sonic flow
Sonic flow

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Hydraulics and Fluid Mechanics in ME
The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is

e > m > d
d > m > e
e > d > m
d > e > m

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Hydraulics and Fluid Mechanics in ME
For small discharge at high pressure, following pump is preferred

Centrifugal
Reciprocating
Axial flow
Mixed flow

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Hydraulics and Fluid Mechanics in ME
A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be

10m
100m
None of these
1 m

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Hydraulics and Fluid Mechanics in ME
A flow is called super-sonic if the

None of these
Discharge is difficult to measure
Mach number is between 1 and 6
Velocity of flow is very high

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