Chemical Engineering - Fluid Mechanics

26. 

Pressure drop in packed bed for turbulent flow is given by the __________ equation.

A. Kozney-Karman
B. Blake-Plummer
C. Leva's
D. Hagen-Poiseulle's

Answer: Option B

Explanation:

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27. 

In the complete turbulence zone (in rough pipes), the

A. rough and smooth pipes have the same friction factor.
B. laminar film covers the roughness projections.
C. friction factor depends upon NRe only.
D. friction factor is independent of the relative roughness.

Answer: Option D

Explanation:

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28. 

Which of the following has the minimum compressibility ?

A. Water at room temperature
B. Air at room temperature
C. Oxygen at room temperature
D. Nitrogen at room temperature

Answer: Option A

Explanation:

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29. 

In case of centrifugal fan or blower, the gas capacity varies as

A. speed
B. (speed)2
C. (speed)3
D. (speed)0.5

Answer: Option A

Explanation:

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30. 

Pick out the wrong statement.

A. A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity.
B. Newton's law of viscosity is not applicable to the turbulent flow of fluid with linear velocity distribution.
C. Laminar flow of viscous liquids is involved in the lubrication of various types of bearings.
D. Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes.

Answer: Option B

Explanation:

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