Chemical Engineering - Fluid Mechanics

46. 

For a particle settling in water at its terminal settling velocity, which of the following is true ?

A. Buoyancy = weight + drag
B. Weight = buoyancy + drag
C. Drag = buoyancy + weight
D. Drag = weight

Answer: Option B

Explanation:

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47. 

A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is

A. 10 KPa
B. 20 KPa
C. 30 KPa
D. 40 KPa

Answer: Option B

Explanation:

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48. 

Pick out the correct statement.

A. A forced vortex occurs when fluid rotates as a solid about an axis.
B. In laminar flow, Newton's law of viscosity does not apply.
C. A free vortex occurs, when fluidrotates as a solid.
D. In turbulent flow, there are neither cross-currents nor eddies.

Answer: Option A

Explanation:

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49. 

Shear stress in a fluid flowing in a round pipe

A. varies parabolically across the cross-section.
B. remains constant over the cross-section.
C. is zero at the centre and varies linearly with the radius.
D. is zero at the wall and increases linearly to the centre.

Answer: Option C

Explanation:

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50. 

The resistance wire used in a hot wire anemometer for conducting electrical current is made of

A. copper
B. tungsten
C. chromium
D. aluminium

Answer: Option B

Explanation:

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