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

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

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Hydraulics and Fluid Mechanics in ME
Runaway speed of a hydraulic turbine is

The speed corresponding to maximum overload permissible
The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open
Full load speed
The speed at which turbine runner will be damaged

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