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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice.

Full
Free
None of these
Partially

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Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is _______ of the jet velocity,

Three-fourth
One-fourth
Double
One-half

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Hydraulics and Fluid Mechanics in ME
When the Mach number is less than unity, the flow is called

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

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Hydraulics and Fluid Mechanics in ME
The hydraulic grade line is

always above the centre line of pipe
always sloping downward in the direction of flow
never above the energy grade line
All of these

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Hydraulics and Fluid Mechanics in ME
The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is

π w ω² r³/4g
π w ω² r²/2g
π w ω² r⁴/4g
π w ω² r²/4g

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Hydraulics and Fluid Mechanics in ME
The undershot water wheels are those in which

The wheel runs entirely by the weight of water
None of these
The wheel runs entirely by the impulse of water
The wheel runs partly by the weight of water and partly by the impulse of water

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