Related Questions

For laminar flow of Newtonion fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship.
A Logarithmic
B Parabolic
C Hyperbolic
D Linear
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
Transition length for turbulent flow in smooth pipe is equal to __________ times the pipe diameter.
A 0.5
B 5
C 50
D 100
The friction factor for turbulent flow in a hydraulically smooth pipe
A Depends only on Reynolds number
B Does not depend on Reynolds number
C Depends on the roughness
D None of these
The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe)
A 0.223 R
B 0.423 R
C 0.577 R
D 0.707 R
The velocity profile exhibited by laminar flow of Newtonion fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an __________ with the apex at the centre line of the pipe.
A Hyperbola
B Parabola
C Semi-circle
D Semi-ellipse
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)
A $$\frac{1}{3}{\text{R}}$$
B $$\frac{1}{2}{\text{R}}$$
C $$\frac{2}{3}{\text{R}}$$
D $$\frac{3}{4}{\text{R}}$$
A marble ball is rolled on a smooth floor of a room to hit a wall. If the time taken by the ball in returning to the point of projection is twice the time taken in reaching the wall, the coefficient of restitution between the ball and the wall, is
A 0.25
B 0.50
C 0.75
D 1.0
A glass ball is shot to hit a wall from a point on a smooth floor. If the ball returns back to the point of projection in twice the time taken in reaching the wall, the coefficient of restitution between the glass ball and the wall is
A 0.25
B 0.33
C 0.40
D 0.50
For turbulent flow of newtonion fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is
A 0.5
B 1
C 0.66

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