Hydraulics and Fluid Mechanics in ME
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar)

0.05 cm
0.20 cm
0.10 cm
0.40 cm

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Hydraulics and Fluid Mechanics in ME
The purpose of a surge tank is

To regulate flow of water to turbines by providing necessary retarding head of water
To eliminate water hammer possibilities
All of these
To control the pressure variations due to rapid changes in the pipe line flow

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