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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The optimum value of vane exit angle for a centrifugal pump impeller is

10-15°
20-25°
30-40°
50-60°

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Hydraulics and Fluid Mechanics in ME
The speed of sound in a ideal gas varies directly as its

absolute temperature
temperature
density
modulus of elasticity

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Hydraulics and Fluid Mechanics in ME
Axial flow pump is started with its delivery valve

Kept fully open
Irrespective of any position
Kept fully closed
Kept 50% open

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Hydraulics and Fluid Mechanics in ME
The velocity corresponding to Reynold number of 2000 is called

Super-sonic velocity
Sub-sonic velocity
Higher critical velocity
Lower critical velocity

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Hydraulics and Fluid Mechanics in ME
Low specific speed of a pump implies it is

Centrifugal pump
None of these
Mixed flow pump
Axial flow pump

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Hydraulics and Fluid Mechanics in ME
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

(1 + cos φ)/2
(1 - cos φ)/2
(1 - sin φ)/2
(1 + sin φ)/2

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