| Velocity distribution in the turbulent boundary layer is |
A) asymptotic
B) logarithmic
C) straight line
D) none of the above
| For turbulent flow in a smooth pipe, if the Reynolds number is 10,000, then what would be the approximate value of friction factor for the pipe? |
A) 0.01
B) 0.02
C) 0.03
D) 0.04
| In laminar flow through a circular pipe, discharge varies |
A) inversely as the viscosity
B) linearly as the viscosity
C) as the square of radius
D) inversely as the pressure
| Calculate the average shear stress on entire plate placed longitudinally in a stream of oil having a free stream velocity of 6 m/s. Specific gravity of oil is 0.9 and kinematic viscosity is 9 × 10–5 m2/s. Reynolds’ number may be taken as (1.328)2 × 104. |
A) 112.2 N/m2
B) 162 N/m2
C) 178.7 N/m2
D) 169.6 N/m2
| The turbulent flow generally occurs in cases involving |
A) very slow motions
B) very viscous fluids
C) liquid flows through tubes of smaller diameter
D) high speed gas flows
| The head loss in turbulent flow in pipe varies |
A) directly as the velocity
B) varies approximately as the square of the velocity
C) varies inversely as the square of the velocity
D) varies inversely as the square of the diameter
| The distance from pipe boundary, at which the point velocity is equal to average velosity for turbulent flow, is |
A) 0.223 R
B) 0.423 R
C) 0.577 R
D) 0.707 R
| According to Nikuradse for turbulent flow in rough pipes, the distance (y’ ) of irregularities from pipe wall is _____ (Note: k = height of protrusion) |
A) 0.025 k
B) 0.03 k
C) 0.25 k
D) 0.30 k
| In case of turbulent flow, the loss of head is approximately proportional to |
A) Velocity
B) (velocity)1/2
C) (velocity)3/4
D) (velocity)2
| Prandtl mixing length |
A) is a universal constant
B) is zero at the pipe wall
C) is independent of the shear stress
D) is independent of the radial distance from the pipe axis
