A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, η0 = 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________________?

Related Mcqs:

1. As per Newton’s law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to (where, μ = fluid viscosity) ?

   A. 1/μ
   B. μ
   C. μ2
   D. 1/μ2

2. In case of Couette flow, the fluid flow is between two large flat parallel plates with___________________?

   A. Top plate moving and the bottom plate fixed
   B. Bottom plate moving and the top plate fixed
   C. Both the plates fixed
   D. Both the plates moving

3. Bernoulli’s equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli’s equation? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ?

   A. A, C, D
   B. B, D, E
   C. A, B, E
   D. A, D, E

4. An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonian fluid beyond yield stress. Which of the following is an ideal plastic ?

   A. Sewage sludge
   B. Rubber latex
   C. Blood
   D. Sugar solution

5. The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is__________________?

   A. Parabolic
   B. Flat
   C. Flat near the wall and parabolic in the middle
   D. Parabolic near the wall and flat in the middle

6. For flow past a flat plate, if „x‟ is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to________________?

   A. √x
   B. 1/√x
   C. x
   D. 1/x

7. The rate of shear versus the shear stress curves are time dependent for _____________ fluid?

   A. Thixotropic
   B. Rheopectic
   C. Both A. & B.
   D. Neither A. nor B.

8. A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an _____________ fluid?

   A. Newtonian
   B. Non-Newtonian
   C. Ideal
   D. Incompressible

9. A fluid whose apparent viscosity increases with shear rate is termed as the _____________ fluid?

   A. Newtonian
   B. Viscous
   C. Dilatant
   D. Non-viscous

10. The ratio of maximum to average velocity in case of streamline flow between parallel plates is______________________?

    A. 1
    B. 1.5
    C. 2
    D. 2.5