Hydraulics & Fluid Mechanics To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than

2.4 m above the hydraulic gradient
6.4 m above the hydraulic gradient
10.0 m above the hydraulic gradient

Hydraulics & Fluid Mechanics At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

minimum
negative value
could be any value
maximum

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

Hydraulics & Fluid Mechanics The flow which neglects changes in a transverse direction is known as

turbulent flow
one dimensional flow
uniform flow

Hydraulics & Fluid Mechanics Choose the wrong statement

when in equilibrium, fluids cannot sustain tangential forces
fluids are capable of flowing
fluids conform to the shape of the con-taining vessels
when in equilibrium, fluids can sustain shear forces

Hydraulics & Fluid Mechanics The surface tension of mercury at normal temperature compared to that of water is

less
same
more or less depending on size of glass tube
more