A. Dependent on Reynolds number
B. Independent of Reynolds number
C. Dependent on the length of the pipe
D. None of these
Related Mcqs:
- 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 - A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any „x‟? Assume incompressible one dimensional flow i.e., no gradients in the radial direction ?
A. VX = V0 + q (x3/L2D)
B. VX = V0 + ⅓q (x3/L2)
C. VX = V0 + 2q (x2/LD)
D. VX = V0 + (4/3) q (x3/L2D) - Which of the following two quantities when same, makes one pipe system equivalent to another pipe system ?
A. Head & discharge
B. Length & discharge
C. Length & diameter
D. Friction factor & diameter - Transition length for a turbulent fluid entering into a pipe is around _____________ times the pipe diameter?
A. 5
B. 50
C. 500
D. 5000 - What is the shear rate at the pipe wall, in case of laminar flow of Newtonian fluids in a pipe of diameter ‘D’ & length ‘L’ incurring a pressure drop ‘Δp’ with average velocity ‘Vavg’ ?
A. D Δp/8L
B. D Δp/4L
C. 8 Vavg/D
D. 4 Vavg/D - Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement ?
A. f1 = f2
B. f1 < f2
C. f1 > f2
D. Data not sufficient to relate f1 & f2 - Transition length for turbulent flow in smooth pipe is equal to _____________ times the pipe diameter?
A. 0.5
B. 5
C. 50
D. 500 - 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 - For the same terminal conditions and fitting size, the least friction loss is incurred in a/an ?
A. T-joint
B. Union
C. 45° elbow
D. 90°bend - Fanning friction factor for laminar flow of fluid in a circular pipe is____________________?
A. Not a function of the roughness of pipe wall
B. Inversely proportional to Reynolds number
C. Both A. & B.
D. Neither A. nor B.
