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# Chemical Engineering - Fluid Mechanics

### Exercise

"To err is human; to forgive, divine."
- Alexander Pope
1.

The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is

 A. 0.1 B. 0.55 C. 0.95 D. 1.85

2.

A conical tank with a bottom opening of cross-sectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking ? Assume that the density of air is negligible as compared to the density of water ρL.

 A. ρL . Vg B. ρL . A.Hg C. ρL . Vg/2 D. ρL .Vg/3

3.

A relief valve

 A. provides back pressure for a cylinder. B. unloads a pump. C. is a directional control valve. D. none of these.

4.

An isentropic process is the one, in which

 A. pv = constant B. pvr = constant C. pvr = constant, and process is reversible D. none of these

5.

The distribution of shear stress in a stream of fluid in a circular tube is

 A. linear with radius for turbulent flow only. B. linear with radius for laminar flow only. C. linear with radius for both laminar & turbulent flow. D. parabolic with radius for both laminar & turbulent flow.