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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is

L/2
L
L/3
L/4

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Hydraulics and Fluid Mechanics in ME
If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by

H = Hg × hf
H = Hg - hf
H = Hg + hf
H = Hg/hf

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Hydraulics and Fluid Mechanics in ME
Stoke is the unit of

Kinematic viscosity in C. G. S. units
Dynamic viscosity in M. K. S. units
Kinematic viscosity in M. K. S. units
Dynamic viscosity in S. I. units

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Hydraulics and Fluid Mechanics in ME
The power developed by a turbine is (where H = Head of water under which the turbine is working)

Directly proportional to H1/2
Inversely proportional to H1/2
Directly proportional to H3/2
Inversely proportional to H3/2

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Hydraulics and Fluid Mechanics in ME
The unit of surface tension is

N-m
N/m3
N/m
N/m2

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Hydraulics and Fluid Mechanics in ME
A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be

1 m
100m
None of these
10m

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