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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For manometer, a better liquid combination is one having

surface tension is no criterion
lower surface tension
high density and viscosity
higher surface tension

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Hydraulics and Fluid Mechanics in ME
The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)

H × √(2g)
√(2gh)
2g × √H
2gH

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

None of these
Axial flow pump
Centrifugal pump
Mixed flow pump

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

(μπ²N/60t) × (R₁² - R₂²)
μπ²N/60t) × (R₁³ - R₂³)
(μπ²N/60t) × (R₁ - R₂)
(μπ²N/60t) × (R₁⁴ - R₂⁴)

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Hydraulics and Fluid Mechanics in ME
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by

dQ/Q = 3 × (dH/H)
dQ/Q = 3/2 × (dH/H)
dQ/Q = 5/2 × (dH/H)
dQ/Q = 2 × (dH/H)

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Hydraulics and Fluid Mechanics in ME
Which of the following turbine is preferred for 0 to 25 m head of water?

Francis turbine
None of these
Pelton wheel
Kaplan turbine

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