Chemical Engineering - Fluid Mechanics

41. 

A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is

A. 25.61 kPa
B. 11.77 kPa
C. 14.86 kPa
D. 21.13 kPa

Answer: Option B

Explanation:

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42. 

Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ?

A. Decrease in effect
B. Increase in thrust
C. Develops noise
D. Develops high pressure

Answer: Option D

Explanation:

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43. 

For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary

A. directly as square of gas density.
B. directly as gas density.
C. directly as square root of gas density.
D. inversely as gas density.

Answer: Option B

Explanation:

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44. 

Capillary tube method of viscosity measurement is based on the

A. Hagen-Poiseulle's equation
B. Stoke's law
C. Navier-stokes equation
D. none of these

Answer: Option A

Explanation:

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45. 

It is possible to integrate an automatic flow controller to a

A. flow nozzle
B. venturimeter
C. rotameter
D. none of these

Answer: Option C

Explanation:

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