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Hydraulics and Fluid Mechanics in ME

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

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

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Hydraulics and Fluid Mechanics in ME
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be

4 m of water column
2 metres of water column
3 metres of water column
3.5 metres of water column

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Hydraulics and Fluid Mechanics in ME
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

(V­1 - V2) / V1
V1 / (V1 - V2)
(V­1² - V2²) / V1²
V1² / (V1² - V2²)

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Hydraulics and Fluid Mechanics in ME
The pressure at a point in a fluid will not be same in all the directions when the fluid is

moving
viscous
inviscous and moving
viscous and moving.

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Hydraulics and Fluid Mechanics in ME
The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

Twice the depth
Twice the breadth
Half the depth
Half the breadth

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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
10 kN/m2
14 kN/m2

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