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

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

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Hydraulics and Fluid Mechanics in ME
The hammer blow in pipes occurs when

The pipe bursts under high pressure of fluid
There is excessive leakage in the pipe
The flow of fluid through the pipe is gradually brought to rest by closing of the valve
The flow of fluid through the pipe is suddenly brought to rest by closing of the valve

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