MCQs of Fluid Kinematics & Dynamics (Fluid Mechanics & Hydraulics - 3140611)

Fluid Mechanics & Hydraulics (3140611) MCQs

MCQs of Fluid Kinematics & Dynamics

Showing 21 to 30 out of 48 Questions

21.

During motion, a fluid element is stated to undergo a change in angle between two adjacent sides when it moves from one place to another. This type of motion is called

(a)	linear deformation
(b)	angular deformation
(c)	rotation
(d)	circulatory motion

22.

In the 3-D motion of the fluid, the component of rotation about z-axis is given by

(a)	$\frac{1}{2} (\frac{\partial u}{\partial z} - \frac{\partial w}{\partial x})$
(b)	$\frac{1}{2} (\frac{\partial v}{\partial x} - \frac{\partial u}{\partial y})$
(c)	$\frac{1}{2} (\frac{\partial w}{\partial y} - \frac{\partial v}{\partial z})$
(d)	$\frac{1}{2} (\frac{\partial v}{\partial y} - \frac{\partial u}{\partial x})$

23.

Which of the following is not a correct statement?

(a)	Vorticity in a fluid motion numerically equals twice the value of rotation.
(b)	For irrotational flow, the curl of the velocity vector is zero.
(c)	Circulation is the line integral of the tangential component of velocity taken round a closed contour.
(d)	Circulation per unit area equals the vorticity in flow.

24.

The flow in which each liquid particle has a definite path and their paths do not cross each other is called

(a)	1-D flow
(b)	steady flow
(c)	streamline flow
(d)	uniform flow

25.

A streamline is a line

(a)	connecting mid points of a flow cross-section
(b)	connecting points of equal velocity in a flow field
(c)	tangent to which at any point dives the direction of the velocity vector at that point
(d)	drawn normal to the velocity vector at any point

26.

The path traced by a single particle of smoke issuing from a cigarette is a

(a)	stream line
(b)	streak line
(c)	path line
(d)	flow line

27.

streamline, streakline and pathline are identical when

(a)	the flow is uniform
(b)	the flow is steady
(c)	the flow is neither steady nor uniform
(d)	the flow velocities do not change steadily with time

28.

For a 2-D flow field, the equation of stream line is given as

(a)	$\frac{u}{d x} = \frac{d y}{v}$
(b)	$\frac{d u}{d x} + \frac{d v}{d y} = 0$
(c)	$\frac{d y}{u} = \frac{d x}{v}$
(d)	$\frac{d x}{u} = \frac{d y}{v}$

29.

A stream line and an equipotential line in a flow field are

(a)	parallel to each other
(b)	perpendicular to each other
(c)	intersect at an acute angle
(d)	are identical

30.

A stream function

(a)	is defined only for steady and incompressible flow
(b)	is a mathematical function which has no physical equivalent
(c)	may not remain constant for a streamline
(d)	satisfies the Laplace equation for rotational motion

Showing 21 to 30 out of 48 Questions