# Chemical Engineering - Fluid Mechanics

1.
The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the
inverse of fluid viscosity.
square of particle size.
difference in the densities of the particle & fluid.
all (a), (b) and (c).
Explanation:
No answer description is available. Let's discuss.

2.
Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time't'. α = a co-efficient to be experimentally determined)?
ε = ε0 + α.t
ε = ε0 + α.t2
ε = ε0 + α.t3
ε = ε0 + α.t4
Explanation:
No answer description is available. Let's discuss.

3.
Nominal size of a pipe is an indication of its __________ diameter.
inner
outer
approximate
none of these
Explanation:
No answer description is available. Let's discuss.

4.
Fluidised beds are formed, when the
fluid friction is zero
gravity force is less than the fluid friction.
pressure forces equal gravity forces.
sum of the fluid friction and pressure forces is equal and opposite to gravity forces.