Chemical Engineering - Fluid Mechanics

26. 

A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity

A. same as that of A.
B. one fourth as that of A.
C. twice as that of A.
D. four times as that of A.

Answer: Option B

Explanation:

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27. 

The pitot static tube does not measure the __________ pressure.

A. static
B. total
C. difference in static & dynamic
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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28. 

The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.

A. Bingham
B. Newtonion
C. perfect
D. none of these

Answer: Option B

Explanation:

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29. 

In fluid flow, cavitation is caused, if the

A. fluid velocity decreases to zero.
B. total energy decreases.
C. both (a) and (b).
D. flow pressure approaches its vapor pressure at the prevailing temperature.

Answer: Option D

Explanation:

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30. 

The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

A. 0.5
B. 1
C. 1.5
D. 2

Answer: Option D

Explanation:

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