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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The specific weight of water in S.I. units is taken as

9.81 × 10-6 N/mm3
9.81 × 103 N/m3
9.81 kN/m3
Any one of these

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Hydraulics and Fluid Mechanics in ME
The units of dynamic or absolute viscosity are

newton-sec per meter
kg sec/meter
newton-sec² per meter
metres² per sec

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Hydraulics and Fluid Mechanics in ME
The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

[2(Vr + v) v]/ Vr²
[(Vr - v) v]/ Vr
[2(Vr - v) v]/ Vr²
[(Vr + v) v]/ Vr

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Hydraulics and Fluid Mechanics in ME
For 450 m head of water, _________ shall be used.

Kaplan turbine
Pelton wheel
Francis turbine
None of these

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Hydraulics and Fluid Mechanics in ME
A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is

(bd²/12) + x̅
d²/12 + x̅
b²/12 + x̅
(d²/12 x̅) + x̅

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Hydraulics and Fluid Mechanics in ME
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity

Two-third
One-half
One-third
Three-fourth

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