A. Mean flow velocity is about 0.5 times the maximum velocity
B. Velocity profile becomes flatter and flatter with increasing Reynolds number
C. Point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius)
D. Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity
profile at the wall are more
Related Mcqs:
- 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 - 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 - For turbulent flow of Newtonian fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is ________________?
A. 0.5
B. 1
C. 0.66
D. < 0.5 - For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, μ = fluid viscosity ) ?
A. μ
B. 1/μ
C. √μ
D. 1/√μ - In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)?
A. Vavg
B. 1.2 Vavg
C. 1.5 Vavg
D. 1.8 Vavg - 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 ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonian fluid in a circular pipe is_____________________?
A. 0.5
B. 1
C. 2
D. 0.66 - Pressure drop for turbulent fluid flow through a circular pipe is given by_________________?
A. 64/Re
B. 32μLV/gc.D2
C. 4f (L/D) (v2/2gc). ρ
D. f (L/D) (v2/2gc). ρ - For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance) ?
A. V/Vmax = (x/r)1/7
B. V/Vmax = (r/x)1/7
C. V/Vmax = (x.r)1/7
D. None of these - The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe) ?
A. V2
B. 1/V2
C. 1/V
D. V
