Hydraulics and Fluid Mechanics in ME
Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is

less than d
greater than 2d
between d and 1.5 d
between 1.5 d and 2d

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Hydraulics and Fluid Mechanics in ME
The overall efficiency of a reaction turbine is the ratio of

Actual work available at the turbine to the energy imparted to the wheel
Power produced by the turbine to the energy actually supplied by the turbine
None of these
Work-done on the wheel to the energy (or head of water) actually supplied to the turbine

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