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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of

0.848
0.392
0.688
0.492

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Hydraulics and Fluid Mechanics in ME
The vapour pressure over the concave surface is

equal to the vapour pressure over the plane surface
greater than the vapour pressure over the plane surface
less man the vapour pressure over the plane surface
zero

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Hydraulics and Fluid Mechanics in ME
The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.

One-half
Two-third
None of these
One-third

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Hydraulics and Fluid Mechanics in ME
According to Bernoulli's equation

Z - p/w - v²/2g = constant
Z + p/w + v²/2g = constant
Z - p/w + v²/2g = constant
Z + p/w - v²/2g = constant

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Hydraulics and Fluid Mechanics in ME
A fluid of kinematic viscosity 0.4 cm²/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be

less than 1 m/sec
1 m/sec
2 m/sec
1.5 m/sec

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Hydraulics and Fluid Mechanics in ME
A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

Pelton wheel with two or more nozzles
Pelton wheel with one nozzle
Kaplan turbine
Francis turbine

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