The distance from pipe boundary, at which the point velocity is equal to average velocity in case of turbulent flow (when R is the radius of the pipe), is
A.0.111 R
B.0.223 R
C.0.446 R
D.0.892 R
Category: Fluid Mechanics and Hydraulic Machines Mcqs
Air vessels in a reciprocating pump are fitted to
A.Reduce the acceleration head
B.Reduce suction head
C.Increase delivery head
D.Smoothen delivery head
E.Increase the opening speed of pump
In case the adhesion between moleules of a fluid is greater than cohesion between fluid and the glass, then the free level of the fluid in glass tube dipped in the glass vessel will be
A.Same as the surface of the fluid
B.Lower than the surface of the fluid
C.Higher than the surface of the fluid
D.Dependent on atmospheric pressure
E.Dependent on atmospheric temperature
The falling drops of rain acquire spherical shape on account of
A.Viscosity
B.Surface tension
C.Compressibility
D.Buoyancy
E.Vapour pressure
The resultant upward pressure of a fluid on a floating body is equal to the wirght of the fluid displaced by the body. This is known as
A.Pascals law
B.Reynolds principle
C.Archimedes principle
D.Schmidt’s hypothesis
E.Bernoulli’s theorem
The critical depth on a channel is given by
A.h = v2/g
B.h = v2/2g
C.h = v/2g
D.h = 2v/g
E.h = v/g
When the dynamic viscosity of a fluid is 0.6 poise and specific gravity is 0.6, the kinematic viscosity of that fluid will be
A.0.36 poise
B.0.6 poise
C.1 poise
D.None of the above
In an open channel the discharge corresponding to critical depth is
A.Minimum
B.Maximum
C.Zero
D.Average
E.None of the above
In order that the water shall never rise more than 100 cm above the crest for a discharge of 5 cube metres per second, the length of weir will be
A.1 metre
B.2.5 metres
C.2.49 metres
D.2.51 metres
E.2.00 metres
The pressure centre is
A.At the centroid of the submerged area
B.The centroid of the pressure prism
C.Independent of the orientation of the area
D.A point on the line of action of the resultant force
E.Always above the centroid of area
