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

Related Mcqs:

1. Fanning friction factor is equal to (where, fB = Blasius friction factor) ?

   A. fB/4 B. fB/2 C. 4fB D. 2fB...

2. If Blasius or Darcy friction factor is ‘f1’ then the Fanning friction factor is equal to____________________?

   A. f1/4 B. 4f2 C. 2f1 D. f1/2...

3. 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...

4. Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will_______________?

   A. Increase B. Decrease C. Remain unchanged D. Increase or decrease depending on the pipe material...

5. 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...

6. For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor?

   A. Brings about no further reduction of B. Increases C. Decreases D. None of these...

7. If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor). ?

   A. Q = Q1 + Q2 + Q3 B. V1 = V2 = V3 C. Q1 = Q2 = Q3 D. f = f1 + f2 + f3...

8. Fanning friction factor equation applies to the _____________ fluid flow?

   A. Non-isothermal condition of B. Compressible C. Both A. and B. D. Neither A. nor B....

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

   A. 0.01 to 0.1 B. 0.1 to 2 C. 2 to 10 D. 10 to 100...

10. Friction produced by the formation of wakes is called the ______________ friction?

    A. Disk B. Skin C. Form D. None of these...