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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The efficiency of a Pelton wheel working under constant head ________ with the increase in power.

Decreases
Remain same
Increases
None of these

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Hydraulics and Fluid Mechanics in ME
An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be

4 kN/m2
12 kN/m2
14 kN/m2
10 kN/m2

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Hydraulics and Fluid Mechanics in ME
Center of pressure compared to e.g. is

Above or below depending on area of body
Below it
At same point
Above it

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

Centrifugal
Mixed flow
Axial flow
Reciprocating

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Hydraulics and Fluid Mechanics in ME
Reynold's number is the ratio of inertia force to

Viscous force
Gravity force
Pressure force
Elastic force

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Hydraulics and Fluid Mechanics in ME
In a free nappe,

The pressure above the nappe is negative
The pressure below the nappe is negative
The pressure below the nappe is atmospheric
The pressure above the nappe is atmospheric

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