Question In steady flow, which one of the following changes with
time
A
Velocity
B
Pressure
C
Density
D
None of these.
Answer
D
Question 'Flow net' analysis cannot be applied to
A
Region close to boundary where viscosity effects
are predominant
B
Sharp turns
C
When flow is Turbulent
D
Rotational flow
Answer
A
Question Pick up the correct statement from the following :
A
B
C
D
Answer
In incompressible flow the density of a fluid remains
constant
In compressible flow, the density of a fluid changes
from point to point
In uniform flow, the velocity of a fluid does not change
with respect to length of flow direction
All of the above
D
Question The line traced by a single fluid
particle as it moves over a period of
time is called __________ line.
A
B
C
D
Answer
Stream
Path
Equipotential
None of these
B
Question A stream tube is that, which has
__________ cross-section entirely
bounded by stream lines.
A
A circular
B
Any convenient
C
A small
D
A large
Answer
B
Question Equation of continuity for 1-D flow
is applicable when,
A
Flow is steady
B
Flow is one dimensional
C
Velocity is not uniform over the
cross-sections
D
All the above.
Answer
D
Question The imaginary line drawn such that
the tangents at its all points indicate
the direction of the velocity of the
fluid particles at each point, is called
A
B
C
D
Answer
Path line
Stream line
Potential line
Streak line.
B
Question One dimensional flow implies
A
B
C
Steady uniform flow.
Unsteady uniform flow.
A flow which does not account for
changes in transverse direction.
D
None of above
Answer
C
Question The flow is called rotational if its
velocity normal to the plane of area
is equal to
A
Angular velocity vector
B
Twice the angular velocity vector
C
Thrice the angular velocity vector
D
.
None of these.
Answer
B
Question The continuity equation in fluid
mechanics utilizes the principle of
conservation of
A
Momentum
B
Mass
C
Energy
D
Both (b) &(c)
Answer
B
Question Streamline is a line in flow field,
A
That is traced by all the fluid particles
passing through a given point.
B
Along which a fluid particle travels.
C
Such that at every point on it, the
velocity is tangential to it.
None of these.
D
Answer
C
Question Potential function is applicable only
for __________ flow.
A
Irrotational
B
Turbulent
C
Steady
D
None of these
Answer
A
Question The property of steam function ψ is
A
B
constant everywhere on any stream
line
The rate of change of ψ with
distance in an arbitrary direction, is
proportional to the component of
velocity normal to that direction
C
The velocity vector may be found by
differentiating the stream function
D
All the above.
Answer
D
Question A three dimensional flow is one in which
A
The flow region has a width ,depth and length
B
The velocity vector is inclined such that it can be
resolved into three mutually perpendicular
directions
C
The fluid moves in straight paths parallel to the
main direction of flow
D
The velocity distribution over parallel planes is
identical throughout the flow region
Answer
B
Question A stream tube is one
A
which is bounded by a closed surface
containing the streamlines
B
which has constant area throughout
its length so that the velocity
remains constant
C
in which the flow cannot cross the
bounding surface
D
Both A and C
Answer
D
Question Normal acceleration in fluid flow
situations exists only when
A
the streamlines are straight and
parallel
B
the flow is two dimensional
C
the streamlines are curved
D
the flow is unsteady
Answer
C
Question Irrational flow is characterized as the
one in which
A
the fluid flows along a straight path
B
C
D
Answer
the fluid does not rotate as it moves
along
the net rotation of fluid particles
about their mass centres remains
zero
the streamlines of flow are curved
and closely spaced
C
Question The existence of velocity potential in
fluid flow indicates that
A
the flow must be Irrotational
B
the flow is rotational and satisfies
the continuity equation
C
the vorticity must be zero
D
All of above
Answer
C
Question The concept of stream function
which is based on the principle of
continuity and is applicable to
A
B
C
D
Answer
three-dimensional flow
Two-dimensional flow only
Uniform flow cases only
For all types of flow
B
Question Streamlines in fluid flow are
A
Equipotential lines along which the
velocity potential Φ= constant
B
C
Lines along which the stream
function Ψ = constant
Lines along which the vorticity is zero
D
None of above
Answer
B
Question A flow net is a graphical representation of
streamlines and equipotential lines such that
A
These lines indicate the direction and magnitude of
velocity vector
B
These lines intersect each other orthogonally
forming curvilinear squares
C
These lines intersect each other at various different
angles forming irregular shaped nets
D
The velocity potential Φ increases in the direction of
flow
Answer
B
Question Streamline, pathline and streakline
are identical when
A
The flow is uniform
B
The flow is steady
C
The flow is unsteady
D
The flow is neither steady nor
uniform
Answer
B
Question The mass acceleration is zero for a
A
B
C
D
Answer
steady flow
steady and uniform flow
unsteady and uniform flow
unsteady and non-uniform flow
B
Question
A
B
C
D
Answer
A control volume implies
an isolated system
a closed system
a specific mass in a fluid flow
a fixed region in space
D
Question If an incompressible liquid is
continuously flowing through a pipe,
the quantity of liquid passing per
second is different at different
sections.
A
True
B
False
C
Depends on pipe size
D
Can't say
Answer
B
Question In a steady flow of a fluid , the total
acceleration of any fluid particle
A
B
C
D
Answer
can be zero
is never zero
is always zero
is independent of coordinates
A
Question For an Irrotational flow, the equation
A
B
C
D
Answer
is given by...
Cauchy-Riemann
Reynold
Laplace
Bernoulli.
C
Question If u, v, w are the components of the
velocity v of a moving particle,
the equation
represents…
A
one dimensional flow
B
two dimensional flow
C
three dimensional flow
D
none of these.
Answer
C
Question The flow net shown in figure is drawn for
A
B
C
D
Retarding flow through converging boundaries
Accelerating flow through Diverging boundaries
Accelerating flow through converging boundaries
Retarding flow through diverging boundaries
Answer
D
Question The relation ∂2Φ/∂x2+∂2Φ/∂y2=0
for an irrotational flow is referred to as
A
Euler's equation
B
Laplace equation
C
Reynolds equation
D
Cauchy-Reimann's equation.
Answer
B
Question Select the correct statement about
equipotential line
A
has a constant dynamic pressure
B
C
D
Answer
connects the mid points of a flow
cross section
exists in case of rotational flows
lies orthogonal to streamlines for the
flow pattern
D
Question The pipe cross section and fluid flow rate are shown in
figure. The velocity in pipe A, is
A
B
C
D
Answer
1.5m/s
3.0 m/s
15 m/s
30 m/s
A
Question For the straight converging streamlines shown
the type of acceleration applicable
A
B
C
D
Answer
No acceleration
Convective tangential acceleration
Local acceleration only
Both local and convective acceleration
B
Question If a stream function exists for a flow field and it
satisfies the Laplace
equation, then
A
flow is rotational
B
continuity equation is satisfied and
the flow is
Irrotational
C
Flow is Irrotational but does not
necessarily
represent a possible flow field
D
the function represents a possible flow field but
does not necessarily satisfy condition for
irrotational motion.
Answer
B
Question Which is not true in the context of
velocity
potential function?
A
is defined as the integral of the
tangential
velocity component along a closed contour
B
exists for irrotational motion of fluids whether
compressible or
incompressible
C
satisfies the Laplace equation
D
lines of constant velocity potential
Answer
A
Question During motion, a fluid element is
stated to undergo a change in angle
between adjacent sides when it
moves from one position to another.
The type of motion is called
A
linear deformation
B
angular deformation
C
rotation
D
Circulatory motion.
Answer
B
Question ... used to describe the motion of
fluid.
A
Eulerian method
B
Langrangian method
C
both (a) and (b)
D
none of these.
Answer
C
Question ... is branch of fluid mechanics which
deals with the study of velocity and
acceleration of the particles of fluid
in motion and their distribution in
space without considering any force
or energy.
A
Fluid Dynamics
B
Fluid Kinematics
C
Fluid Statics
D
none of these.
Answer
B
Question An observer sitting on the bank of a
river and studying the movement of fluid
particle or floating body is a example of …
A
B
C
D
Answer
Eulerian method
Langrangian method
both (a) and (b)
none of these.
A
Question An observer sitting in moving boat
and studying the flow is a example of
…
A
Eulerian method
B
Langrangian method
C
both (a) and (b)
D
none of these.
Answer
B
Question The shortcomings of the Langrangian
method to describe the motion of
fluid are…
A
Cumbersome and Complex
B
Equation of motion are very difficult
to solve
C
The motion of fluid is hard to
understand
D
All of the above.
Answer
D
Question
A
B
C
D
Answer
O out of the following which
method is used exclusively in fluid
mechanics to describe the motion of
fluid, especially because of its
mathematical simplicity?
both (b) and (c)
Langrangian method
Eulerian method
none of these.
C
Question The acceleration of fluid particle
consists of …..
A
both (b) and (c)
B
connective acceleration
C
local acceleration
D
none of these.
Answer
A
Question …..is scalar function of space and
time such that its negative derivative
w.r.t. any direction gives the fluid
velocity in that direction.
A
Φ
B
Ψ
C
both (a) and (b)
D
none of the above.
Answer
A
Question Any function Φ satisfies the …
equation is a possible irrotational
flow (potential flow) case since the
continuity is satisfied.
A
Euler’s
B
Bernoulli’s
C
Newton’s
D
Laplace.
Answer
D
Question Which of the following equation
represents the possible case of an
irrotational flow?
A
B
C
D
Answer
both (a) and (b).
A
Question The mathematical expression shows
that...(u/v)(-v/u)=-1
A
stream lines and equipotential lines
do not meet orthogonally
B
stream lines and equipotential lines
meet orthogonally
C
both (a) and (b)
D
None of the above.
Answer
B
Question Which one of the following velocity fields
represents a possible fluid flow?
A
u=x, v=y
B
u=x2 , v = y2
C
u= xy , v = x2y2
D
u=x , v= -y
Answer
D
Question Two flow patterns are represented by their stream
functions Ψ1 and Ψ2as 1 = x2+y2and Ψ2= 2xy. If
these two patterns are superposed on one another
, the resulting streamline pattern can be
represented by one of the following
A
A family of parallel streamlines
B
A family of circles
C
A family of parabolas
D
A family of hyperbolas
Answer
D
Question In a compressible flow, the area of flow, the velocity
of flow and the mass density are denoted by a,v
and m respectively. At a particular section, the
differential form of the continuity equation is
A
da/a = dv/v +dm/m
B
da/a = dv/v -dm/m
C
da/a =- dv/v +dm/m
D
da/a =- dv/v -dm/m
Answer
D
Question Consider the following parameters related to fluid
flow
1 Vorticity
2 Velocity potential
3 Stream function
Among these , those which exist both in rotational flows and
Irrotational flows would include
A
1 and 2
B
2 and 3
C
1 and 3
D
1,2 and 3
Answer
C
Question An inert tracer is injected continuously from a point
in an unsteady flow field. The locus of locations of
all the tracer particles at an instance of time
represents
A
streamline
B
Path line
C
stream tube
D
streak line
Answer
D
Question The rate of rotation of a fluid particle
is given
A
ωy = 0 , ωz = - y/2h
B
ωy = 0 , ωz = y/2h
C
ωy = y/h , ωz = y/h
D
none of these
Answer
A
Question Which of the following conditions
will be
satisfied by steady Irrotational flow?
1 ∂u/∂y+∂v/∂x =0
2 - ∂u/∂y+∂v/∂x =0
3 ∂u/∂x+∂v/∂y =0
select the correct answer using the codes given below codes
A
B
C
D
Answer
1 and 2
2 and 3
1 and 3
1,2 and 3
B
Question The relation that must hold for the
flow to be Irrotational
A
∂u/∂ y –∂ v /∂ x = 0
B
∂ u/∂ x –∂ v /∂ y = 0
C
∂2u/∂ x2+∂2v /∂y2=0
D
∂u/∂ y +∂v /∂ x = 0
Answer
A
Question The following stream function ψ = x3/3 –x2–xy2+y2
will represent /satisfy
A
rotational flow and Laplace equation
B
Irrotational flow and Laplace equation
C
Irrotational flow and equation of
continuity
D
Answer
Irrotational flow ,Laplace equation and equation of
continuity
D
Question Consider the following statements
1.In Lagrangian method of describing the motion of fluid , an
observer concentrates on a point in the fluid system .
2. The components of acceleration of the fluid particle are v
∂v/∂s and ∂v/∂s
3. A particle moving in a curved path will always have a
normal acceleration v2/r towards the centre of the curved
path.
Which of these statements are
A
1,2 and 3
B
1 and 2
C
1 and 3
D
2 and 3
Answer
D
Question Acceleration in the normal direction to a stream
line is represented by (symbols have usual
meanings)
A
∂Vn/∂t + Vs2/r
B
∂Vs/∂t + Vn2/r
C
∂Vn/∂t + ∂Vs /∂t
D
∂Vs/∂t + ∂Vs /∂ t
Answer
A
Question A two dimensional flow is described by velocity
components u= 2x and v =-2y . The discharge
between points (1,1) and (2,2 ) is equal to
A
9 units
B
8 units
C
7 units
D
6 units
Answer
A
Question The flow through an irrigation canal
is an example of ….
A
Steady flow
B
Unsteady flow
C
Uniform flow
D
Non-uniform.
Answer
A
Question The flow around a uniform diameter
pipe-bend or canal bend is an
example of ….
A
Steady flow
B
Unsteady flow
C
Uniform flow
D
Non-uniform.
Answer
D
Question The flow in pipe where average flow
parameters are considered for
analysis” is an example of ….
A
One dimensional flow
B
Three dimensional flow
C
Both (a) and (b)
D
Two dimensional flow.
Answer
A
Question The flow between parallel plates of
infinite extent is an example of ….
A
B
C
D
Answer
One dimensional flow
Three dimensional flow
Both (a) and (b)
Two dimensional flow.
D
Question
….
A
B
C
D
Answer
Ground water flow is an example of
Two dimensional flow
Uniform flow
Rotational flow
Laminar flow.
D
Question Flow in natural streams, artificial
channel, water supply pipes, sewers
are the example of…
A
Turbulent flow
B
Uniform flow
C
Rotational flow
D
Laminar flow.
Answer
A
Question In experimental work often a colour
or dye or some other substance
(such as smoke in case of gases) is
injected into the flowing fluid, in
order to trace the motion of the fluid
particles. The resulting trail of colour
is known as a …
A
Stream line
B
Stream tube
C
Path line
D
Streak line.
Answer
D
Question To study the basic principles of fluid
flow; a definite volume with fixed
boundary shape is chosen in space
along the fluid flow passage, this
volume is known as….
A
Stream volume
B
Control volume
C
Proper volume
D
Streak volume.
Answer
B
Question If the fluid particles move in straight
lines and all the line are parallel to
the surface, the flow is called
A
B
C
D
Answer
steady
uniform
compressible
laminar
D
Question If the velocity in a fluid flow changes
with respect to length along the
direction of flow, it is called
A
unsteady flow
B
compressible flow
C
Irrotational flow
D
none of the above
Answer
D
Question Irrotational flow means
A
fluid does not rotate while moving.
B
C
D
Answer
fluid moves in straight lines.
net rotation of fluid particles about
their mass centers is zero.
none of the above.
C
Question If the Reynolds number of the flow is
less than 2000, the flow is said to be
A
B
C
D
Answer
Laminar flow
Transit
Turbulent flow
none of these
A
Question The acceleration of a fluid particle in
the direction of x is given by _
A
ax=u ∂u/∂x+ v∂v/∂y + w∂w/∂z+∂u/∂t
B
ax=u ∂u/∂x+ v∂u/∂y + w∂u/∂z+∂u/∂t
C
ax=u ∂u/∂x+ u∂u/∂y + u∂u/∂z+∂u/∂t
D
None of the above
Answer
B
Question The convective acceleration of fluid
in the x-direction is given by
A
u ∂u/∂x+ v∂u/∂y + w∂u/∂z
B
u ∂u/∂x+ v∂v/∂y + w∂w/∂z
C
u ∂u/∂x+ u∂v/∂y + w∂w/∂z
D
∂u/∂t+ ∂v/∂t + ∂w/∂t
Answer
D
Question ΔΨbetween two stream lines
represents
A
head
B
pressure
C
velocity
D
discharge
Answer
D
Question Stream lines and equipotential lines
_
A
form meshes of any geometrical
shapes
B
are orthogonal wherever they meet
C
D
Answer
can be determined mathematically
for all boundary conditions
can be drawn graphically for viscous
flow around any boundary
B
Question If Ψ= x2- y2is the stream function in a
2D flow field, the magnitude of
resultant at point (2, 3) is,
A
√52 unit
B
√15 unit
C
√5 unit
D
√125 unit
Answer
A
Question A grid obtained by drawing a series
of streamlines Ψ and equipotential
lines Φ is known as
A
Stream line
B
Path line
C
Streak line
D
Flow net
Answer
D
Question For a Irrotational flow, the velocity
potential lines and the streamlines
are always
A
coplanar
B
Inclinedto the horizontal.
C
parallel to each other
D
orthogonal to each other
Answer
A
Question Stream lines and path lines always
coincide in case of
A
laminar flow
B
uniform flow
C
turbulent flow
D
steady flow
Answer
D
Question Consider the flowing statements.
For a two-dimensional potential flow
1. Laplace equation for stream function must
be satisfied
2. Laplace equation for potential function
must be satisfied
3. Streamlines and equipotential lines are
perpendicular
4. Stream function and potential function
and not interchangeable.
Which of these statements are correct ?
A
B
C
D
Answer
1 and 4
2 and 4
1, 2 and 3
2, 3 and 4.
C
Question For a two-dimensional fluid element
in x-y plane, the rotational
component is given as _
A
ωz=1/2(∂v/∂x-∂u/∂y)
B
ωz=1/2(∂u/∂x-∂v/∂y)
C
ωz=1/2(∂u/∂x+∂v/∂y)
D
ωz=1/2(∂v/∂x+∂u/∂y)
Answer
A
Question The flow of blood in small veins is an
example of
A
Laminar flow
B
Turbulent flow
C
Transitional
D
none of these
Answer
A
Question A flow whose streamline is
represented by a curve, is called _
A
B
C
D
Answer
two-dimensional flow
one dimensional flow
three dimensional flow
four dimensional flow
A
Question The existence of velocity potential in
fluid flow indicates that the
A
circulation around any closed curve
must have a finite value
B
flow is rotational and satisfies the
continuity equation
C
Vorticity must be non-zero.
D
flow must be Irrotational
Answer
D
Question The local acceleration in the
direction of x is given by
A
∂u/∂t
B
u (∂u/∂x)
C
u (∂u/∂x+∂u/∂t)
D
None of the above
Answer
A
Question The rate of increase of velocity with
respect to changes in the position of
fluid particle in a flow field is called _
A
B
C
D
Answer
convective acceleration
local acceleration
material acceleration
none of these
A
Question The general form of expression for the
continuity equation in a Cartesian coordinate
system for incompressible or compressible 3-D
flow is given by _
A
∂ρ/∂t+ ∂/∂x(ρu)+∂/∂y (ρv )+∂/∂z(ρw) =0
B
∂ρ/∂t+ ∂/∂x(ρu)+∂/∂y (ρv )+∂/∂z(ρw) =1
C
D
∂u/∂x+∂v/∂y +∂w/∂z=0
∂/∂x(ρu)+∂/∂y (ρv )+∂/∂z(ρw) =0
Answer
A
Question Vorticity in the z-direction is given by,
A
B
C
D
Answer
2(∂v/∂x-∂u/∂y)
(∂u/∂x-∂v/∂y)
(∂u/∂x+∂v/∂y)
(∂v/∂x+∂u/∂y)
A
Question The motion is described as when the
components of rotation or vorticity are zero
throughout certain point of the
fluid.
A
rotational
B
irrotational
C
either of the above
D
None of the above
Answer
B
Question The concept of stream function which is based on
the principle of continuity is applicable to
A
rotational flow only
B
two-dimensional flow only
C
three-dimensional flow
D
uniform flow only.
Answer
B
Question -----is defined mathematically as the line integral of
the tangential velocity about a closed path (contour).
A
B
C
D
Answer
circulation
vorticity
either of the above
none of the above.
A
Question In a fluid-flow the stream lines are lines
A
B
along which the vorticity is zero
along which the stream function Ψ=constant
C
which are parallel to the equipotential lines
D
which exist in irrotational flow only.
Answer
B
Question . ...... is a curve which gives an instantaneous picture
of the location of the fluid particles which have
passed through a given point.
A
Path line
B
Stream line
C
Streak line
D
None of the above.
Answer
C
Question Which aspect is not true in the
context of a
flow-net?
A
is applicable to Irrational fluid flow
B
the bounding surface forms streamlines and the
equipotential lines intersect the boundaries at
right angles
C
spacing between streamlines as well as that
between equipotential lines is inversely
proportional to local velocities
D
for prescribed bounding surface, the flow net
changes with reversal in the flow direction.
Answer
D
Question If the Reynolds number is more than 4000, the flow in
a pipe is
A
laminar flow
B
turbulent flow
C
transition flow
D
none of the above.
Answer
B
Question
A
B
C
D
Answer
If the flow is Irrotational as well as steady it is known as
non-uniform flow
one-dimensional flow
potential flow
none of the above.
C
Question The flow in a pipe whose valve is being opened or
closed gradually is an example of
A
steady flow
B
unsteady flow
C
rotational flow
D
compressible flow.
Answer
B
Question Continuity equation for compressible fluid states
that
A
discharge at any section is constant
B
discharge is different at different section
C
density is constant at all sections along the flow
D
none of the above.
Answer
B
Question When a highly viscous fluid flows at a slow velocity,
the flow becomes
A
Laminar
B
turbulent
C
uniform
D
Steady.
Answer
A
Question A continuity equation for two-dimensional
compressible flow is given by
A
B
C
D
Answer
(∂u/∂x)+(∂v/∂y)=0
∂/∂x(ρu)+ ∂/∂y(ρv)=0
u∂u/∂y+v∂v/∂y=0
U(∂ρ/∂x)+v(∂ρ/∂y)=0
B
Question A continuity equation given as
∂u/∂x+∂v/∂y+∂w/∂z=0
A
is valid for steady flow whether the flow is
compressible or incompressible
B
is not valid for incompressible, unsteady flow
C
is valid for steady & incompressible flow
D
is valid for ideal fluid flow only.
Answer
C
Question A flow has diverging straight stream lines. If the
flow is steady, the flow
A
is uniform with local acceleration
B
has convective tangential acceleration
C
has convective normal acceleration
D
has both convective normal and tangential
accelerations.
Answer
B
Question Flow of fluid of fluid in a pipe takes
place from
A
Higher level to lower level
B
Higher pressure to lower pressure
C
Higher energy to lower energy
D
None of the above
Answer
C
Question
A
B
C
D
Answer
Vorticity is given by
Two time of rotation
1.5 times of rotation
3 times of rotation
Equal to rotation
A
Question Study of fluid motion with the forces
causing the flow is known as
A
Kinematics of fluid flow
B
Dynamics flow
C
Statics of flow
D
Kinematics of fluid flow
Answer
B
Question Cipolleti weir is a trapezoidal weir
having side slopes of
A
1 horizontal to 2 vertical
B
4 horizontal to 1 vertical
C
1 horizontal to 4 vertical
D
1 horizontal to 3 vertical
Answer
C
Question Francis formula for a rectangular weir for two
end contraction is given by
A
Q= 1.84( L -0.2 x 2H) H5/2
B
Q= 1.84 ( L -02H) H3/2
C
Q= 1.84 ( L -0.2 H)H5/2
D
None of the above
Answer
B
Question Irrotational flow means
A
Fluid does not rotate while flowing
B
C
D
Answer
Fluid moves in straight lines
Net rotation of fluid particles about
their mass centers is zero
None of the above
C
Question For irrotational flow the velocity potential
lines and stream lines are always
A
Parallel to each other
B
coplanar
C
Orthogonal to each other
D
Inclined to horizontal
Answer
B
Question Irrotational flow occurs when
A
Flow takes place in duct of uniform cross section
at constant mass flow rate
B
Streamlines are curved
C
There is no net rotation of fluid element about its
mass center
D
Fluid element does not undergo any change in
shape or size
Answer
C
Question The figure shows
A
B
C
D
Answer
Stream line
Streak line
Path line
None of the above
C
Question For the two dimensional flow, the stream function
is given by ψ = 2xy. The velocity at a point (3, 4) is
A
B
C
D
Answer
6 m/sec
8 m/sec
10 m/sec
12 m/sec
C
Question The flow in a river during the period of heavy
rainfall is :
A
steady ,uniform, two-dimensional
B
unsteady ,uniform, threedimensional
C
unsteady ,non-uniform and three –
dimensional
D
steady, non-uniform and three
dimensional
Answer
C
Question Two dimensional stream function
A
Relates velocity and pressure.
B
Is constant along a stream line.
C
Is constant along an equipotential
surface.
None of these.
D
Answer
B
Question What causes convective acceleration
in fluid flow ?
A
Steep slope in flow
B
Unsteady nature of flow
C
Non-uniformity of flow
D
Turbulence in flow
Answer
C
Question A flow at an instant is represented by curved v con verging
streamlines. The type of acceleration is
A
B
C
D
Normal acceleration only
Tangential acceleration only
Both normal and tangential acceleration
None of above
Answer
C
Question
A
B
C
D
Velocity of flow is independent of
temperature &pressure, when the flow is
Unsteady through unchanged cross-section.
Steady through changing cross-section.
Steady and the cross-section are unchanged.
Unsteady and the cross-section is changed.
Answer
C
A fluid element has a velocity V = (-y2.x)i +
(2yx2). j. The motion at (x, y) = (l/2, 1) is a
possible case of
rotational
Irrotational
Irrotational and compressible
Irrotational and incompressible
Question
A
B
C
D
Answer
B
Question An equipotential line is __________
to the streamline at every point.
A
B
C
D
Answer
Normal
Parallel
Tangential
None of these
A
Question Steady fluid flow occur when the
derivative of flow variables satisfy
the following condition.
A
∂v/∂t=0
B
∂v/∂t=1
C
∂x/∂t=0
D
∂t/∂s=0
Answer
A
Question Unsteady non-uniform flow is
represented by flow through an
A
B
C
Long pipe at constant rate.
Long pipe at decreasing rate
Expanding tube at increasing rate.
D
Expanding tube at constant rate.
Answer
C
Question Uniform fluid flow occurs, when the
derivative of the flow variables
satisfy the following condition.
A
B
C
D
Answer
∂s/∂t=0
∂v/∂t=0
∂x/∂t=0
∂t/∂s=0
A
Question A water supply pipeline changes its alignment
through a bend . when the flow in the pipeline is
increases by operating a valve , the flow in the bend
is classified as
A
unsteady, uniform flow
B
unsteady ,non-uniform flow
C
steady ,uniform flow
D
steady, non-uniform flow
Answer
B
Question The pressure gradient in the direction of flow is
equal to the
A
shear gradient parallel to the direction of flow
B
shear gradient normal to the direction of flow
C
velocity gradient parallel to the direction of flow
D
Answer
velocity gradient normal to the direction of flow
B
Question A velocity field with no components in the y and z
directions is given by, v = 6 + 2xy + t2The
acceleration along the x-direction at a point (3, 1,2)
at time 2, is
A
36 units
B
8 units
C
16 units
D
46 units
Answer
A
Question Velocity field in fluid V = 4x3i - 10 x2yj + 2 tk. The velocity
of particle at (2, 3, 1) and t = 2 sec. is,
A
124 m/s
B
12 m/s
C
24 m/s
D
111 m/s
Answer
A
Question The velocity potential function for 2D flow is
Φ= x(2y -1). At point P(1,1), the velocity is,
A
√5 unit
B
√15 unit
C
√1.5 unit
D
√2.5 unit
Answer
A
Question The circulation ſ around a circle of radius 2 units for
the velocity field u = 2x +3y and v = -2y is
A
-6π units
B
-12π units
C
-18π units
D
-24π units
Answer
B
Question The x component of velocity in a two dimensional
incompressible flow is given by u= 1.5x . At the
point (x,y) =(1,0) , the y component of velocity v=0 .
The equation for the y component of velocity is
A
v=0
B
v = 1.5y
C
v= -1.5x
D
v= -1.5 y
Answer
D
Question A velocity field with no components in the y and z
direction is given by V= 6+2xy +t2. the acceleration
along the x- direction at a point (3,1,2) at time t=2 , is
A
B
C
D
Answer
8 units
16 units
20 units
36 units
C
Question The velocity in m/s at a point in a two –dimensional
flows is given as V =2i+3j . The equation of the
stream line passing through the point is
A
3dx-2dy =0
B
2x+3y =0
C
3dx +2dy =0
D
xy =6
Answer
A
Question Consider the following statements
1 In a source , equipotential lines are circles
2.Flow net is a representation of 2 dimensional Irrotational flow
of incompressible fluid.
3 Boundaries act as a limiting equipotential lines in a flow net
4 In a uniform flow region, streamlines will be parallel and
equidistant. Of these statements
A
1,2 and 3 are correct
B
1,2 and 4 are correct
C
2,3 and 4 are correct
D
1,3 and 4 are correct
Answer
B
Question If Φ=x(2y-1)find the velocity at (-3,-5)
A
B
C
D
Answer
12.04 units
12.52 units
18.06 units
5.55units
B
Question A steady three dimensional flow field is described
by a velocity vector as
V = (2x2 +3y) i+ (-2xy + 3y3 + 3yz)j + (-3z2/2 – 2xz +9y2z)k
Magnitude of
velocity at point (1,-2,1) is equal to
A
B
C
D
Answer
2.5 m/s
41.8
62.5
1784.25
B
Question Which one of the following velocity
represents a possible fluid flow?
A
u = x; v = y
B
u = xy; v = x2y2
C
u = x; v = - y
D
u = x2; v= y2
Answer
C
fields
Question Velocity field in fluid V = 4x3i - 10 x2y j + 2 tk. The
acceleration component in x-direction at (1, 1, 1) and t
= 3 sec is,
A
78m/s2
B
98m/s2
C
28m/s2
D
48m/s2
Answer
D
Question The stream function for two
dimensional flow is given by ψ = 2xy. The
resultant velocity at a point P(2,3)
A
8.45 units /s
B
7.21 units /s
C
6.44 units /s
D
5.18 units /s
Answer
B
Question Water flows through a straight uniform pipe in
which the discharge is reduced from 100 lps to
zero in 10 seconds. If the cross sectional area of
pipe is 200sq-cm,find the acceleration and its
type.
A
Tangential acceleration with a value of -0.5m/s2
B
Uniform acceleration with a value of -0.1m/s2
C
Normal acceleration with a value of 1.5m/s2
D
Convective acceleration with a value of -0.5m/s2
Answer
A
Question If the stream function in flow is given by Ψ=1.5 x2.
What is the nature of the flow represented by this function.
A
B
C
D
Answer
Parallel to y axis in downward direction
Parallel to Parallel to x axis
Concentric circle
Normal to y-axis in upward direction
A
Question In a 3-D incompressible flow,the velocity components
are u=x2+z2+5,and v= y2+z2-3,find the missing
component so that it satisfy continuity equation.
A
w= -2(x+y)z + f(x,y,z)
B
w=(y+z)x + f(x,y,z)
C
w=-(x+y)+ f(x,y,z)
D
w= 2x+y)z + f(x,y,z)
Answer
A
Question The velocity along a streamline passing through
origin is given by
V=2√x2+y2 the velocity and acceleration at (4,3)
A
25 m/s &30m/s2
B
15 m/s &30m/s2
C
10 m/s &20m/s2
D
2.5 m/s &3.0m/s2
Answer
C
Question A Stream function is given by Ψ=3x2+ 3y2.Is the flow
possible,if so find the magnitude of the
velocity.
A
15.25m/s
B
20.83m/s
C
21.63m/s
D
12.58m/s
Answer
C
Question A diverges uniformly from 0.1m to 0,2m diameter
over a length of 1m.Determine the local and
convective acceleration at the mid section assuming a
flow rate of 0.1m3/s
A
5 m/s2&22.25 m/s2
B
0 & -42.76m/s2
C
0.5m/s2
D
0 &0.15 m/s2
Answer
B
Question Water flows through a pipe which diverges from
20cms from one end to 40 cms at the other. If a
constant discharge of 150 lps flows through it find
the velocity at both ends to maintain the discharge.
A
B
C
D
Answer
12.5 m/s&15.56m/s
1.83m/s&0.85m/s
2.83 m/s&1.5m/s
4.83 m/s &1.25m/s
D
.
Question The red lines shown indicates ----A
Stream line
B
Streak line
C
Path line
D
None of the above
Answer
D
Question The area of 2 long tapered duct decreases as A
=0.5-0.2 x) where x,is the distance in meters. At a
given instant a discharge of 0.5m3/s is flowing in the
duct and is found to increase at a rate of 0.2m3/s.
The local acceleration at x=0 will be
A
1.4
B
1.0
C
0.4
D
0.667
Answer
B
Question A liquid flows downwards through a tapered
vertical portion of a pipe. At the entrance and exit
of the pipe the static pressure are equal. If for a
vertical height 'h' velocity becomes 4 times the ratio
of 'h'the velocity head at the entrance will be
A
3
B
8
C
15
D
24
Answer
C
Question
In the figure the line joining the points is called as
A
B
C
D
Answer
Stream line
Streak line
Path line
None of the above
B
Question A stream function is give by(x 2- y 2)
function of the flow will be
A
2xy + f(x)
B
2xy + constant
C
2(x2- y2)
D
2Xy + f(y)
Answer
B
the potential
Question A Pitot-static tube is used to measure the velocity of
water using a differential gauge which contain
manometric liquid of relative density 1.4.The
defection in gauge when water flows at a velocity of
1.2m/s will be (assume coefficient of tube to be 1)
A
B
C
D
Answer
183.5mm
52.4mm
5.24mm
73.4mm
B
Question The fig shows ----
A
Stream tube which is a fluid mass bounded by a group of stream lines.
B
C
D
Pipe consisting of network of potential lines .
Pipe consisting of network of path lines
None of the above
Answer
A
Question The flow through pipe shown in
figure is a---
A
B
C
D
Answer
One dimensional flow
Two dimensional flow
Three dimensional flow
Four dimensional flow
C
Question The flow through pipe shown in figure is
A
B
C
D
Answer
Laminar flow
Turbulent flow
Transitional flow
None of the above
A
Question The flow through pipe shown in figure is
A
B
C
D
Answer
Laminar flow
Turbulent flow
Transitional flow
None of the above
B
Question The path taken by smoke coming out of chimney
shows ----lines
A
B
C
D
Answer
Stream line
Streak line
Path line
None of the above
B
Question The velocity components in x and y
directions in terms of velocity
potential Φ are
A
u= - ∂Φ/∂x, v= - ∂Φ/∂y
B
u= ∂Φ/∂x, v= - ∂Φ/∂y
C
u= ∂Φ/∂y, v= ∂Φ/∂x
D
u= - ∂Φ/∂x v= ∂Φ/∂y
Answer
A
Question The velocity components in x and y
directions in terms of stream
function Ψ are
A
u= - ∂Ψ/∂y, v= ∂Ψ/∂x
B
u= ∂Ψ/∂x, v= ∂Ψ/∂y
C
u= ∂Ψ/∂y, v= ∂Ψ/∂x
D
u=- ∂Ψ/∂x, v= ∂Ψ/∂y
Answer
A
Question Which of the following statement is false for
two-dimensional flow field ?
A
If Φexists, Ψ will also exist
B
If Ψexists, Φ will also exist
C
If Φ exists the flow will be rotational
D
If Ψ exists flow will be either rotational or
irrotational.
Answer
D
Question The figure illustrates
A
B
C
D
Pure or linear translation of fluid particles
Linear motion with deformation fluid particles
Rotational motion fluid particles
Angular deformation fluid particles
Answer
D
Question The figure illustrates
A
B
C
D
Pure or linear translation of fluid particles
Linear motion with deformation fluid particles
Rotational motion fluid particles
Angular deformation fluid particles
Answer
D
Question The flow pattern represented in fig (a),(b) &(c) can be
expressed respectively as
A
B
C
D
y=c, x=c &y= mx+c
y=f(x), x=y2&y= mx+c
y=mx c,x=y2& x= my+c
y= 0,x=0 &y= x2
Answer
A
Question The flow pattern represented in fig (d) and (e) can
be expressed respectively as -
A
B
C
D
Answer
y=c, y= mx+c
y= f(x), x2+y2=c
y=mx ,x=y2& x= my+c
y= x&y= x2
B
Question The figure shows 2 pipes of different size. Find the loss
of energy between section (1) &(2)
A
B
C
D
Answer
1.276 kg-m
1.00 kg-m
0,725 kg-m
0.15 kg-m
C
Question An elbow nozzle assembly shown in figure is in a
horizontal plane .The velocity of flow from nozzle is
A
B
C
D
Answer
4 m/s
16 m/s
24 m/s
30 m/s
C
Question The component of velocity u and v
along x
and y directions in a 2D incompressible fluid are
A
u=x2cos y ; v=2x siny
B
u= x+2; v=1-y
C
u=xyt; v=x3– y2t/2
D
U= ln x+ y; v= xy – y/x
Answer
A
Question A flow in a 2D was represented by mesh consisting of
intersection of the two lines. The graphical representation is known as
A
B
C
D
Answer
Intersection of flow and potential line
Intersection of velocity and flow lines
Flow net
None of the above
C
Question The flow net shown in figure is drawn for
A
B
C
D
Retarding flow through converging boundaries
Accelerating flow through Diverging boundaries
Accelerating flow through converging boundaries
Retarding flow through diverging boundaries
Answer
C
Question The head loss in case of hot water flow through a
pipe compared to cold water will be
A
same
B
more
C
less
D
More or less depending on temperature
Answer
C
Question For a flow through a horizontal pipe,
gradient in the flow direction is
A
+ve
B
1
C
zero
D
-ve
Answer
D
the pressure
Question The differential manometer connected to pitot static
tube used for measuring fluid velocity gives
A
Static pressure
B
Total pressure
C
Dynamic pressure
D
Difference between total and dynamic pressure
Answer
C
Question The realization of velocity potential in fluid flow indicates
that the
A
Flow must be irrotational
B
Circulation around any close curve must have a finite value
C
Flow is rotational and and satisfy the contunity equation
D
Vorticity must be non zero
Answer
A
Question The figure illustrates
A
B
C
D
Pure or linear translation of fluid particles
Linear motion with deformation fluid particles
Rotational motion fluid particles
Angular deformation fluid particles
Answer
A
Question In a 2-D flow in a x-y plane, if ∂u/∂y =∂v/∂x then
fluid element will undergo
A
Translation only
B
Translation and rotation
C
Translation and deformation
D
Rotation and deformation
Answer
A
Question Path line can cross the stream line at right angles
when flow is
A
rotational
B
Irrotational and unsteady
C
Irrotational and steady
D
Unsteady
Answer
D
Question The following are the practical examples of continuity equation
A
For one dimensional flow-if mean velocity at one section is
known, the mean velocity at any other section can be found out
B
For two dimensional flow-if any one velocity component is
known, its perpendicular component at that point can be
computed
Both A &B
None of the above
C
D
Answer
C
Question The method of drawing flow net by graphical method
A
B
C
D
Answer
Velocity potential lines are drawn first
Streamlines are drawn first
Velocity potential lines and stream lines are drawn
simultaneously
None of the above
B
Question If u=2yz+t2 , v=x2z-t, w=xy2,find the acceleration
along ax at point(2,1,2) direction at time t=1sec
A
30 m/s2
B
28.5 m/s2
C
15 m/s2
D
20.5 m/s2
Answer
A
Question Flow is represented by the stream function Ψ =xy. the
velocity components u and v are------and flow is --------
A
B
C
D
Answer
U=x2,v=y2 and rotational
u=x, v=-y and flow is irrotational
u=x, v=-y and flow is rotational
none of these
B
Question A flow is represented by a group of concentric
streamlines as shown in fig. The type of acceleration in
such flow is
A
B
C
D
Answer
Local Acceleration
Total Acceleration
No acceleration
Convective normal acceleration
D
Question The magnitude of the component of velocity at a
point (1,1) for a stream function ψ=x2-y2 is equal to
A
B
C
D
Answer
2
2√2
4
4√2
B
Question In a two dimensional incompressible steady flow
around an airfoil , the stream lines are 2cm apart
at a great distance from the airfoil , where the
velocity is 30m/s . The velocity near the airfoil ,
where the stream lines are 1.5cm apart , is
A
22.5 m/s
B
33 m/s
C
40 m/s
D
90 m/s
Answer
C
Question
A
B
C
D
Answer
Stream function y = uy –vx represents
free vortex motion
uniform flow parallel to x axis
uniform flow parallel to y axis
uniform flow inclined to x axis
D
Question For the streamline shown if fig the type of acceleration
applicable is
A
B
C
D
Answer
Convective acceleration
Local Acceleration
Total Acceleration
No acceleration
D
Question Identify the statements pertaining to laminar flow
(1) fluid particles exhibit a regular pattern of flow
(2) fluid flows through a narrow passage
(3) momentum transfer is on macroscopic level
(4) the injection of smoke or dye fills the pipe
A
1 &2
B
2
C
1
D
1 &4
Answer
A
Question
A
B
C
D
Answer
A flow through a long pipe at varying
rate is called __________ uniform flow.
steady
unsteady
One dimensional flow
Rotational flow
B
Question
A
B
C
D
Answer
A flow in which each liquid particle
has a definite path and their paths do
not
cross each other, is called
Steady flow
Uniform flow.
Streamline flow
Turbulent flow
C
Question
A stream line is
A
The line of equal velocity in a flow
B
The line along which the rate of pressure drop is
uniform
C
The line along the geometrical center of the flow
D
Fixed in space in steady flow.
Answer
D
Question
Separation of flow occurs due to
reduction of pressure gradient to
A
B
C
Zero
Negligibly low value
The extent such that vapour formation starts
D
.
None of the above
Answer
C
Question A flow through an expanding tube at
constant rate is called
A
Steady uniform flow
B
Steady non-uniform flow
C
Unsteady uniform flow
D
Unsteady non-uniform flow
Answer
B
Question The continuity equation
A
Expresses the relationship between
work and energy
B
Relates the momentum per unit volume between two points
on a stream line
C
Relates mass rate of flow along a stream line
D
Requires that Newton's second law of motion be satisfied at
every point in fluid.
Answer
C
Question If u, v, w are the components of the
velocity V of a moving particle, the
equation represents
A
One-dimensional flow
B
Two dimensional flow
C
Three dimensional flow
D
None of these
Answer
C
Question The figure illustrates
A
B
C
D
Pure or linear translation of fluid particles
Linear motion with deformation fluid particles
Rotational motion fluid particles
Angular deformation fluid particles
Answer
B
Question In an experimental work to trace the motion of fluid
particles, a coloured dye may be injected into the flowing fluid and the
resulting coloured filament lines at a given location give -------line
A
B
C
D
Answer
Stream line
Streak line
Path line
None of the above
B
Question A flow, in which the quantity of liquid
flowing per second is constant, is
called __________ flow.
A
Steady
B
Streamline
C
Turbulent
D
Unsteady
Answer
A
Question For steady flow of a perfect fluid
through a contracted section in a
horizontal tube, which of the
following statements are true
A
The mass flow rate is the same inside
and outside the contracted section.
B
C
D
Answer
The pressure is higher inside the
contracted section
The fluid slows down as it passes
through the contracted section
None of the above
A
Question The resistance wire used in a hot
wire anemometer for conducting
electrical current is made of
A
Copper
B
Tungsten
C
Chromium
D
Aluminum
Answer
A
Question A steady uniform flow is through
A
A long pipe at decreasing rate
B
C
A long pipe at constant rate
An expanding tube at constant rate
D
An expanding tube at increasing rate
Answer
B
Question Pick out the wrong statement about
a streamline.
A
It is always parallel to the main
direction of the fluid flow
B
It is a line across which there is no
flow and it is equivalent to a rigid
boundary.
C
Streamlines intersect at isolated
point of zero velocity and infinite
velocity.
D
The mass of fluid between any two
streamlines can be considered
constant
Answer
C
Question Steady non-uniform flow is
exemplified by flow through an
A
B
Long pipe at constant rate.
Expanding tube at increasing rate.
C
Expanding tube at constant rate.
D
None of above
Answer
C
Question If velocities of fluid particles vary
from point to point in magnitude and
direction, as well as from instant to
instant, the flow is said to be
A
Laminar
B
Turbulent flow
C
Uniform flow
D
Non-uniform flow
Answer
B
Question What type of motion the fluid
element undergoes, when it changes
from one position to another
position, such that the angle
between the two sides changes in
direction?
A
Rotation
B
Translation
C
Linear deformation
D
Angular deformation
Answer
D
Question Uniform flow is said to occur when
A
Size and shape of the cross-section in
a particular length remain constant
B
Size and shape of the cross-section
change along a length
Frictional loss in the particular length
of the pipe will the more than the
drop in its elevation
Frictional loss in the particular length
of the pipe, will be less than the drop
in elevation.
C
D
Answer
A
Question The continuity equation in ideal fluid
flow states that
A
Net rate of flow into any small
volume must be zero.
B
Energy is not constant along a
streamline.
C
There exists a velocity potential.
D
Answer
None of above
A
Question Equation of continuity of flow is
principle of
conservation of
A
Mass
B
Momentum
C
Force
D
None of these.
Answer
A
based on the
Question
A
B
C
D
For an irrotational motion
the fluid elements do not undergo a circular motion
the velocity is constant at every point in the flow field
the fluid particles do not rotate
about their mass
centres while
moving along a streamline
the fluid elements do not experience any shear.
Answer
C
Question
A
B
C
D
Flow is rotational if the
fluid element undergoes linear deformation
fluid element undergoes angular deformation
fluid element undergoes net rotation in a plane about an axis
normal to the plane
flow takes place in a circular path.
Answer
C
Question
A
B
C
D
Answer
During the opening of a valve, the flow is
laminar
unsteady
uniform
rotational.
B
Question Mark the wrong statement:
A
streamlines cannot start or end
anywhere
except at the interface or infinity
B
streamline spacing varies directly as the flow
velocity
C
streamlines can meet at a stagnation point where
the velocity is zero
D
the flow is only possible in direction of falling
velocity potential
Answer
B
Question For a two-dimensional flow field, the
equation of a streamline is given as
A
B
C
D
Answer
u/dx=dy/v
du/dx= dv/ dy/=0
dy/u= dx/v
dx/u= dy/v
D
Question The flow-net analysis can be used to determine
A
quantity of seepage and upward lift press
B
the efficient boundary shapes, for which the flow
does not separate.
C
the velocity and pressure distribution for given
boundaries of flow (provided the velocity
distribution and pressure at any reference section
are known).
D
all of the above.
Answer
D
Question If velocity potential Φ satisfies the Laplace’s
equation, it represents the possible ..... flow.
A
unsteady, compressible, rotational
B
steady, compressible, irrotational
C
unsteady, incompressible, rotational
D
Steady, incompressible, irrotational.
Answer
D
Question ---------is defined as a scalar function of space and
time such that its negative derivative with respect
to any direction gives the fluid velocity in that
direction.
A
potential function
B
Stream function
C
Circulation
D
Vorticity.
Answer
A
Question Body perfume is sprayed. The flow of spray mist so
generated will represent,
A
B
C
D
Answer
Path line
Streamline
Streak line
flow line
C