# Chemical Engineering - Fluid Mechanics

46.
For a particle settling in water at its terminal settling velocity, which of the following is true ?
Buoyancy = weight + drag
Weight = buoyancy + drag
Drag = buoyancy + weight
Drag = weight
Explanation:
No answer description is available. Let's discuss.

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
10 KPa
20 KPa
30 KPa
40 KPa
Explanation:
No answer description is available. Let's discuss.

48.
Pick out the correct statement.
A forced vortex occurs when fluid rotates as a solid about an axis.
In laminar flow, Newton's law of viscosity does not apply.
A free vortex occurs, when fluidrotates as a solid.
In turbulent flow, there are neither cross-currents nor eddies.
Explanation:
No answer description is available. Let's discuss.

49.
Shear stress in a fluid flowing in a round pipe
varies parabolically across the cross-section.
remains constant over the cross-section.
is zero at the centre and varies linearly with the radius.
is zero at the wall and increases linearly to the centre.