A. Gravity forces
B. Viscous forces
C. Pressure forces
D. Turbulent forces
A. Fluid flow rate & friction loss
B. Length & friction factor
C. Diameter & friction factor
D. Length & diameter
A. Wall roughness
B. Reynolds number
C. Both A. & B.
D. Neither A. nor B.
A. Geometrical similarity only
B. Dynamic similarity only
C. Both geometrical and dynamic similarity
D. All geometrical, dynamic and kinematic similarity
A. Temporal velocity components
B. Mean square of velocity fluctuations in the three co-ordinate directions
C. Root mean square of velocity fluctuations in the three co-ordinate directions
D. None of these
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
A. Minimising wall friction
B. Suppressing boundary layer separation
C. Both A. & B.
D. Neither A. nor B.