A. Disk
B. Skin
C. Form
D. None of these
Related Mcqs:
- 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 - Fanning friction factor is equal to (where, fB = Blasius friction factor) ?
A. fB/4
B. fB/2
C. 4fB
D. 2fB - 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 - 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 - 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 - What is the value of Fanning friction factor f ‘ for smooth pipe at NRe = 106 approximately ?
A. 0.003
B. 0.01
C. 0.1
D. 0.3 - In which of the following body shapes, the pressure drag is large compared to the friction drag ?
A. Stream line body
B. Two dimensional body
C. Bluff body
D. None of these - In turbulent flow, a rough pipe has the same friction factor as a smooth pipe____________________?
A. In the zone of complete turbulence
B. When the roughness projections are much smaller than the thickness of the laminar film
C. Everywhere in the transition zone
D. When the friction factor is independent of the Reynold’s number - For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the wall of the pipe and the friction velocity ‘v’, and it follows a _____________ relationship?
A. Logarithmic
B. Linear
C. Hyperbolic
D. Parabolic - The friction factor is___________________?
A. Always inversely proportional to the Reynolds number
B. Not dimensionless
C. Not dependent on the roughness of the pipe
D. None of these