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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The speed ratio in case of Francis turbine varies from

1 to 1.5
0.4 to 0.5
0.6 to 0.9
0.15 to 0.3

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Hydraulics and Fluid Mechanics in ME
If no resistance is encountered by displacement, such a substance is known as

Gas
Water
Ideal fluid
Fluid

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Hydraulics and Fluid Mechanics in ME
An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of 'g' at this place is

9.75 m/sec²
9 m/sec
9.81 m/sec²
10 m/sec²

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

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

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Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant pressure, the speed capacity and power vary

Inversely as density
As square of density
Directly as the air or gas density
Inversely as square root of density

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Hydraulics and Fluid Mechanics in ME
The two important forces for a floating body are

buoyancy, inertial
inertial, gravity
buoyancy, pressure
buoyancy, gravity

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