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# Chemical Engineering - Fluid Mechanics

### Exercise

"Loneliness is the most terrible poverty."
- Mother Teresa
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

 A. inverse of fluid viscosity. B. square of particle size. C. difference in the densities of the particle & fluid. D. all (a), (b) and (c).

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)?

 A. ε = ε0 + α.t B. ε = ε0 + α.t2 C. ε = ε0 + α.t3 D. ε = ε0 + α.t4

3.

Nominal size of a pipe is an indication of its __________ diameter.

 A. inner B. outer C. approximate D. none of these

4.

Fluidised beds are formed, when the

 A. fluid friction is zero B. gravity force is less than the fluid friction. C. pressure forces equal gravity forces. D. sum of the fluid friction and pressure forces is equal and opposite to gravity forces.

5.

A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is __________ hp.

 A. 1 B. 10/55 C. 5.5 D. 1/55