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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

Broad-crested weir
Submerged weir
Narrow-crested weir
Ogee weir

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Hydraulics and Fluid Mechanics in ME
The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

Develops unit power under unit head
Delivers unit discharge under unit speed
Develops unit power under unit speed
Delivers unit discharge under unit head

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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?

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

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

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

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Hydraulics and Fluid Mechanics in ME
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit discharge of wheel is

2.5 m3/s
0.5 m3/s
1.5 m3/s
0.25 m3/s

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Hydraulics and Fluid Mechanics in ME
Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

Kaplan turbine
Francis turbine
None of these
Pelton wheel

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