Stoke’s equation is valid in the Reynolds number range__________________?

Related Mcqs:

1. The Navier-Stokes equation deals with the law of conservation of___________________?

   A. Mass
   B. Energy
   C. Both A. & B.
   D. Momentum

2. Navier-Stokes equation is useful in the analysis of _____________ fluid flow problems?

   A. Non-viscous
   B. Viscous
   C. Turbulent
   D. Rotational

3. Stoke’s law is valid, when the particle Reynolds number is ______________________?

   A. < 1
   B. > 1
   C. < 5
   D. None of these

4. Which of the following is the „Blasius equation‟, relating friction factor to the Reynolds number ?

   A. f = 0.079.NRe-0.25
   B. f-0.5 = 4.07 loge (NRef)-0.6
   C. Both ‘a’ and ‘b’
   D. None of these

5. The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/√f)-0.4, is called the _____________ equation?

   A. Nikuradse
   B. Von-Karman
   C. Blasius
   D. Colebrook

6. Colebrook equation for friction factor in turbulent flow is given by, f-0.5 = -4 loge [(ε/D) + (1.26/NRe √F). It reduces to Nikuradse equation for a value of (ϵ/D) equal to __________________?

   A. 0
   B. 1
   C. ∞
   D. 0.5

7. 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

8. The Reynolds number for an ideal fluid flow is _________________?

   A. 4
   B. 2100-4000
   C. 4000
   D. ∞

9. In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of___________________?

   A. Relative roughness
   B. Absolute roughness
   C. Friction co-efficient for flows at equal Reynold number
   D. All A., B. & C.

10. Reynolds number is the ratio of____________________?

    A. Viscous forces to gravity forces
    B. Inertial forces to viscous forces
    C. Viscous forces to inertial forces
    D. Inertial forces to gravity forces