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

Related Mcqs:

1. 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

2. 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

3. 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

4. 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________________?

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

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

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

6. The distribution of shear stress in a stream of fluid in a circular tube is_____________________?

   A. Linear with radius for turbulent flow only
   B. Linear with radius for laminar flow only
   C. Linear with radius for both laminar & turbulent flow
   D. Parabolic with radius for both laminar & turbulent flow

7. 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

8. The pressure drop per unit length of pipe incurred by a fluid ‘X’ flowing through pipe is Δp. If another fluid ‘Y’ having both the specific gravity & density just double of that of fluid ‘X’, flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be__________________?

   A. Δp
   B. 2Δp
   C. Δp2
   D. Δp/2

9. The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a _____________ fluid?

   A. Bingham
   B. Newtonian
   C. Perfect
   D. None of these

10. 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