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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea

hot wire anemometer
rotameter
pitot tube
Venturimeter

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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)

0.20 cm
0.05 cm
0.10 cm
0.40 cm

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Hydraulics and Fluid Mechanics in ME
The unit speed of the turbine runner is

N/H²
N/H
N/H3/2
N/√H

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Hydraulics and Fluid Mechanics in ME
Gradually varied flow is

steady non-uniform
non-steady non-uniform
steady uniform
non-steady uniform

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Hydraulics and Fluid Mechanics in ME
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water , the horse power required will be

Same
1.5 B.H.P
0.75 B.H.P
H.P./0.75

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Hydraulics and Fluid Mechanics in ME
Maximum impulse will be developed in hydraulic ram when

Supply pipe is long
Waste valve closes suddenly
Supply pipe is short
Ram chamber is large

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