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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
A perfect gas

is of theoretical interest
is incompressible
None of these
has constant viscosity

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Hydraulics & Fluid Mechanics
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

force of diffusion
force of friction
force of cohesion
force of adhesion

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Hydraulics & Fluid Mechanics
The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid (where pi and p2 are mass densities.)

steady flow
incompressible flow
frictionless flow
uniform flow

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Hydraulics & Fluid Mechanics
Separation of flow occurs when

the boundary layer comes to rest
All of these
the pressure intensity reaches a minimum
the cross-section of a channel is reduced

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Hydraulics & Fluid Mechanics
The difference of pressure between the inside and outside of a liquid drop is

p = T/2r
(b)p = T/r
(d)p = 2T/r
(a)p = Txr

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Hydraulics & Fluid Mechanics
Coefficient of velocity for Borda’s mouth piece running full is

0.707
0.611
0.855
1.00

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