Chemical Engineering - Fluid Mechanics

26. 

Location of vena-contracta in an orificemeter does not depend upon the

A. type of orifice.
B. density, viscosity & compressibility of the fluid.
C. ratio of pipe diameter to orifice diameter.
D. pipe roughness.

Answer: Option A

Explanation:

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27. 

At low Reynolds number

A. viscous forces are unimportant.
B. viscous forces control.
C. viscous forces control and inertial forces are unimportant.
D. gravity forces control.

Answer: Option C

Explanation:

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28. 

For laminar flow through a closed conduit

A. Vmax = 2Vav
B. Vmax = Vav
C. Vmax = 1.5Vav
D. Vmax = 0.5Vav

Answer: Option A

Explanation:

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29. 

In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.

A. inverse
B. square root
C. second power
D. first power

Answer: Option B

Explanation:

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30. 

Unsteady uniform flow is represented by flow through a/an

A. long pipe at constant rate.
B. long pipe at decreasing rate.
C. expanding tube at increasing rate.
D. expanding tube at constant rate.

Answer: Option B

Explanation:

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