Hydraulics and Fluid Mechanics in ME
The buoyancy depends upon the

Compressibility of the liquid
Weight of the liquid displaced
Viscosity of the liquid
Pressure with which the liquid is displaced

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Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of an impulse turbine is the

Ratio of the actual work available at the turbine to the energy imparted to the wheel
Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
None of these
Ratio of the work done on the wheel to the energy of the jet

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Hydraulics and Fluid Mechanics in ME
A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by

l/d⁴ = (l₁/d₁⁴) + (l₂/d₂⁴) + (l₃/d₃⁴)
l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵)
l/d² = (l₁/d₁²) + (l₂/d₂²) + (l₃/d₃²)
l/d³ = (l₁/d₁³) + (l₂/d₂³) + (l₃/d₃³)

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