AnswerD QuestionIn steady flow, which one of the following changes with time AVelocity BPressure...

Answer D

Question In steady flow, which one of the following changes with time

A VelocityB PressureC DensityD None of these.

Answer A

Question 'Flow net' analysis cannot be applied toA Region close to boundary where viscosity effects are predominantB Sharp turnsC When flow is TurbulentD Rotational flow

Answer D

Question Pick up the correct statement from the following :

A In incompressible flow the density of a fluid remains constant

B In compressible flow, the density of a fluid changes from point to point

C In uniform flow, the velocity of a fluid does not change with respect to length of flow direction

D All of the above

Answer B

Question The line traced by a single fluid particle as it moves over a period of time is called __________ line.

A StreamB PathC EquipotentialD None of these

Answer B

Question A stream tube is that, which has __________ cross-section entirely bounded by stream lines.

A A circularB Any convenientC A smallD A large

Answer D

Question Equation of continuity for 1-D flow is applicable when,

A Flow is steadyB Flow is one dimensionalC Velocity is not uniform over the

cross-sectionsD All the above.

Answer B

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 Path lineB Stream lineC Potential lineD Streak line.

Answer C

Question One dimensional flow impliesA Steady uniform flow.B Unsteady uniform flow.C A flow which does not account for

changes in transverse direction.

D None of above

Answer B

Question The flow is called rotational if its velocity normal to the plane of area is equal to

A Angular velocity vectorB 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 MomentumB MassC EnergyD Both (b) &(c)

Answer C

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.

D None of these.

Answer A

Question Potential function is applicable only for __________ flow.

A IrrotationalB TurbulentC SteadyD None of these

Answer D

Question The property of steam function ψ is

A constant everywhere on any stream line

B The rate of change of ψ with distance in an arbitrary direction, is proportional to the component of velocity normal to that directionC The velocity vector may be found by

differentiating the stream function

D All the above.

Answer B

Question A three dimensional flow is one in which A The flow region has a width ,depth and lengthB 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 flowD The velocity distribution over parallel planes is identical throughout the flow region

Answer D

Question A stream tube is oneA which is bounded by a closed surface

containing the streamlinesB which has constant area throughout

its length so that the velocity remains constantC in which the flow cannot cross the

bounding surfaceD Both A and C

Answer C

Question Normal acceleration in fluid flow situations exists only when

A the streamlines are straight and parallel

B the flow is two dimensionalC the streamlines are curvedD 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 the fluid does not rotate as it moves along

C the net rotation of fluid particles about their mass centres remains zero

D the streamlines of flow are curved and closely spaced

Answer C

Question The existence of velocity potential in fluid flow indicates that

A the flow must be IrrotationalB the flow is rotational and satisfies

the continuity equationC the vorticity must be zeroD All of above

Answer B

Question The concept of stream function which is based on the principle of continuity and is applicable to

A three-dimensional flowB Two-dimensional flow onlyC Uniform flow cases onlyD For all types of flow

Answer B

Question Streamlines in fluid flow are A Equipotential lines along which the

velocity potential Φ= constant

B Lines along which the stream function Ψ = constant

C 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 vectorB These lines intersect each other orthogonally forming curvilinear squaresC These lines intersect each other at various different

angles forming irregular shaped netsD The velocity potential Φ increases in the direction of

flow

Answer B

Question Streamline, pathline and streakline are identical when

A The flow is uniformB The flow is steadyC The flow is unsteadyD The flow is neither steady nor

uniform

Answer B

Question The mass acceleration is zero for a

A steady flowB steady and uniform flowC unsteady and uniform flowD unsteady and non-uniform flow

Answer D

Question A control volume impliesA an isolated systemB a closed systemC a specific mass in a fluid flowD a fixed region in space

Answer B

Question If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections.A TrueB FalseC Depends on pipe sizeD Can't say

Answer A

Question In a steady flow of a fluid , the total acceleration of any fluid particle

A can be zero B is never zero C is always zero D is independent of coordinates

Answer C

Question For an Irrotational flow, the equation

is given by...A Cauchy-RiemannB ReynoldC LaplaceD Bernoulli.

Answer C

Question If u, v, w are the components of the velocity v of a moving particle, the equation

represents…A one dimensional flowB two dimensional flowC three dimensional flowD none of these.

Answer D

Question The flow net shown in figure is drawn for

A Retarding flow through converging boundariesB Accelerating flow through Diverging boundariesC Accelerating flow through converging boundariesD Retarding flow through diverging boundaries

Answer B

Question The relation ∂2Φ/∂x2+∂2Φ/∂y2=0 for an irrotational flow is referred to as

A Euler's equationB Laplace equationC Reynolds equationD Cauchy-Reimann's equation.

Answer D

Question Select the correct statement about equipotential line

A has a constant dynamic pressure

B connects the mid points of a flow cross section

C exists in case of rotational flows

D lies orthogonal to streamlines for the flow pattern

Answer A

Question The pipe cross section and fluid flow rate are shown in figure. The velocity in pipe A, is

A 1.5m/sB 3.0 m/sC 15 m/sD 30 m/s

Answer B

Question For the straight converging streamlines shown the type of acceleration applicable

A No accelerationB Convective tangential accelerationC Local acceleration onlyD Both local and convective acceleration

Answer B

Question If a stream function exists for a flow field and it satisfies the Laplace equation, then

A flow is rotationalB continuity equation is satisfied and the flow is

IrrotationalC Flow is Irrotational but does not necessarily

represent a possible flow fieldD the function represents a possible flow field but does not necessarily satisfy condition for irrotational motion.

Answer A

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 contourB exists for irrotational motion of fluids whether compressible or incompressibleC satisfies the Laplace equationD lines of constant velocity potential

Answer B

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 deformationB angular deformationC rotationD Circulatory motion.

Answer C

Question ... used to describe the motion of fluid.

A Eulerian methodB Langrangian methodC both (a) and (b)D none of these.

Answer B

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 DynamicsB Fluid KinematicsC Fluid StaticsD none of these.

Answer A

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 Eulerian methodB Langrangian methodC both (a) and (b)D none of these.

Answer B

Question An observer sitting in moving boat and studying the flow is a example of

…A Eulerian methodB Langrangian methodC both (a) and (b)D none of these.

Answer D

Question The shortcomings of the Langrangian method to describe the motion of fluid are…

A Cumbersome and ComplexB Equation of motion are very difficult

to solveC The motion of fluid is hard to

understandD All of the above.

Answer C

Question 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?

A both (b) and (c)B Langrangian methodC Eulerian methodD none of these.

Answer A

Question The acceleration of fluid particle consists of …..

A both (b) and (c)B connective accelerationC local accelerationD 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 ΦB ΨC both (a) and (b)D none of the above.

Answer D

Question Any function Φ satisfies the … equation is a possible irrotational flow (potential flow) case since the continuity is satisfied.

A Euler’sB Bernoulli’sC Newton’sD Laplace.

Answer A

Question Which of the following equation represents the possible case of an irrotational flow?

A

B

C

D both (a) and (b).

Answer B

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 orthogonallyC both (a) and (b)D None of the above.

Answer D

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 followingA A family of parallel streamlinesB A family of circlesC A family of parabolasD 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 C

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 D

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 streamlineB Path line C stream tube D streak line

Answer A

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 B

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 1 and 2 B 2 and 3 C 1 and 3 D 1,2 and 3

Answer A

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=0D ∂u/∂ y +∂v /∂ x = 0

Answer D

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 Irrotational flow ,Laplace equation and equation of continuity

Answer 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 A

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 flowB Unsteady flowC Uniform flowD Non-uniform.

Answer D

Question The flow around a uniform diameter pipe-bend or canal bend is an example of ….

A Steady flowB Unsteady flowC Uniform flowD Non-uniform.

Answer A

Question The flow in pipe where average flow parameters are considered for analysis” is an example of ….

A One dimensional flowB Three dimensional flowC Both (a) and (b)D Two dimensional flow.

Answer D

Question The flow between parallel plates of infinite extent is an example of ….

A One dimensional flowB Three dimensional flowC Both (a) and (b)D Two dimensional flow.

Answer D

Question Ground water flow is an example of ….A Two dimensional flowB Uniform flowC Rotational flowD Laminar flow.

Answer A

Question Flow in natural streams, artificial channel, water supply pipes, sewers are the example of…

A Turbulent flowB Uniform flowC Rotational flowD Laminar flow.

Answer D

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 lineB Stream tubeC Path lineD Streak line.

Answer B

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 volumeB Control volumeC Proper volumeD Streak volume.

Answer D

Question If the fluid particles move in straight lines and all the line are parallel to the surface, the flow is called

A steady B uniform C compressible D laminar

Answer D

Question If the velocity in a fluid flow changes with respect to length along the direction of flow, it is called

A unsteady flowB compressible flowC Irrotational flow D none of the above

Answer C

Question Irrotational flow means A fluid does not rotate while moving.

B fluid moves in straight lines.C net rotation of fluid particles about

their mass centers is zero.D none of the above.

Answer A

Question If the Reynolds number of the flow is less than 2000, the flow is said to be

A Laminar flowB TransitC Turbulent flowD none of these

Answer B

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 D

Question The convective acceleration of fluid in the x-direction is given by

A u ∂u/∂x+ v∂u/∂y + w∂u/∂zB u ∂u/∂x+ v∂v/∂y + w∂w/∂zC u ∂u/∂x+ u∂v/∂y + w∂w/∂zD ∂u/∂t+ ∂v/∂t + ∂w/∂t

Answer D

Question ΔΨbetween two stream lines represents

A headB pressureC velocityD discharge

Answer B

Question Stream lines and equipotential lines _A form meshes of any geometrical

shapesB are orthogonal wherever they meet

C can be determined mathematically for all boundary conditions

D can be drawn graphically for viscous flow around any boundary

Answer A

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 unitC √5 unitD √125 unit

Answer D

Question A grid obtained by drawing a series of streamlines Ψ and equipotential lines Φ is known as

A Stream lineB Path line C Streak lineD Flow net

Answer A

Question For a Irrotational flow, the velocity potential lines and the streamlines are always

A coplanarB Inclinedto the horizontal.C parallel to each otherD orthogonal to each other

Answer D

Question Stream lines and path lines always coincide in case of

A laminar flowB uniform flowC turbulent flowD steady flow

Answer C

Question Consider the flowing statements.For a two-dimensional potential flow

1. Laplace equation for stream function must be satisfied2. Laplace equation for potential function must be satisfied3. Streamlines and equipotential lines are perpendicular4. Stream function and potential function and not interchangeable.Which of these statements are correct ?

A 1 and 4 B 2 and 4C 1, 2 and 3 D 2, 3 and 4.

Answer A

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 flowB Turbulent flowC Transitional D none of these

Answer A

Question A flow whose streamline is represented by a curve, is called _A two-dimensional flowB one dimensional flowC three dimensional flowD four dimensional flow

Answer D

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 A

Question The local acceleration in the direction of x is given byA ∂u/∂tB 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 convective accelerationB local accelerationC material accelerationD none of these

Answer 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 ∂u/∂x+∂v/∂y +∂w/∂z=0D ∂/∂x(ρu)+∂/∂y (ρv )+∂/∂z(ρw) =0

Answer A

Question Vorticity in the z-direction is given by,

A 2(∂v/∂x-∂u/∂y)B (∂u/∂x-∂v/∂y)C (∂u/∂x+∂v/∂y)D (∂v/∂x+∂u/∂y)

Answer B

Question The motion is described as when the components of rotation or vorticity are zero throughout certain point of the fluid.A rotational B irrotationalC either of the aboveD 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 onlyB two-dimensional flow onlyC three-dimensional flowD uniform flow only.

Answer A

Question -----is defined mathematically as the line integral of the tangential velocity about a closed path (contour).

A circulation B vorticityC either of the above D none of the above.

Answer B

Question In a fluid-flow the stream lines are linesA along which the vorticity is zeroB along which the stream function Ψ=constant

C which are parallel to the equipotential lines

D which exist in irrotational flow only.

Answer C

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 lineB Stream lineC Streak lineD None of the above.

Answer D

Question Which aspect is not true in the context of a flow-net?

A is applicable to Irrational fluid flowB 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 velocitiesD for prescribed bounding surface, the flow net changes with reversal in the flow direction.

Answer B

Question If the Reynolds number is more than 4000, the flow in a pipe is

A laminar flowB turbulent flowC transition flow D none of the above.

Answer C

Question If the flow is Irrotational as well as steady it is known asA non-uniform flowB one-dimensional flowC potential flowD none of the above.

Answer B

Question The flow in a pipe whose valve is being opened or closed gradually is an example of

A steady flowB unsteady flowC rotational flowD compressible flow.

Answer B

Question Continuity equation for compressible fluid states that

A discharge at any section is constantB discharge is different at different sectionC density is constant at all sections along the flowD none of the above.

Answer A

Question When a highly viscous fluid flows at a slow velocity, the flow becomes

A Laminar B turbulentC uniform D Steady.

Answer B

Question A continuity equation for two-dimensional compressible flow is given by

A (∂u/∂x)+(∂v/∂y)=0B ∂/∂x(ρu)+ ∂/∂y(ρv)=0C u∂u/∂y+v∂v/∂y=0D U(∂ρ/∂x)+v(∂ρ/∂y)=0

Answer C

Question A continuity equation given as ∂u/∂x+∂v/∂y+∂w/∂z=0A is valid for steady flow whether the flow is compressible or incompressibleB is not valid for incompressible, unsteady flowC is valid for steady & incompressible flow D is valid for ideal fluid flow only.

Answer B

Question A flow has diverging straight stream lines. If the flow is steady, the flowA is uniform with local accelerationB has convective tangential accelerationC has convective normal accelerationD has both convective normal and tangential accelerations.

Answer C

Question Flow of fluid of fluid in a pipe takes place from

A Higher level to lower levelB Higher pressure to lower pressure

C Higher energy to lower energy

D None of the above

Answer A

Question Vorticity is given byA Two time of rotationB 1.5 times of rotationC 3 times of rotationD Equal to rotation

Answer B

Question Study of fluid motion with the forces causing the flow is known as

A Kinematics of fluid flowB Dynamics flowC Statics of flowD Kinematics of fluid flow

Answer C

Question Cipolleti weir is a trapezoidal weir having side slopes of

A 1 horizontal to 2 verticalB 4 horizontal to 1 verticalC 1 horizontal to 4 verticalD 1 horizontal to 3 vertical

Answer B

Question Francis formula for a rectangular weir for two end contraction is given byA 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 C

Question Irrotational flow meansA Fluid does not rotate while flowing

B Fluid moves in straight linesC Net rotation of fluid particles about

their mass centers is zeroD None of the above

Answer B

Question For irrotational flow the velocity potential lines and stream lines are alwaysA Parallel to each otherB coplanarC Orthogonal to each otherD Inclined to horizontal

Answer C

Question Irrotational flow occurs whenA Flow takes place in duct of uniform cross section

at constant mass flow rateB Streamlines are curvedC There is no net rotation of fluid element about its

mass centerD Fluid element does not undergo any change in shape or size

Answer C

Question The figure shows

A Stream line B Streak line C Path line D None of the above

Answer C

Question For the two dimensional flow, the stream function is given by ψ = 2xy. The velocity at a point (3, 4) is

A 6 m/secB 8 m/secC 10 m/secD 12 m/sec

Answer C

Question The flow in a river during the period of heavy rainfall is :A steady ,uniform, two-dimensionalB unsteady ,uniform, three- dimensionalC unsteady ,non-uniform and three –dimensionalD steady, non-uniform and three dimensional

Answer B

Question Two dimensional stream function

A Relates velocity and pressure.

B Is constant along a stream line.

C Is constant along an equipotential surface.

D None of these.

Answer C

Question What causes convective acceleration in fluid flow ?

A Steep slope in flowB Unsteady nature of flowC Non-uniformity of flowD 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 Normal acceleration onlyB Tangential acceleration onlyC Both normal and tangential accelerationD None of above

Answer C

Question Velocity of flow is independent of temperature &pressure, when the flow is

A Unsteady through unchanged cross-section.B Steady through changing cross-section.C Steady and the cross-section are unchanged.D Unsteady and the cross-section is changed.

Answer B

Question 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

A rotational B Irrotational C Irrotational and compressibleD Irrotational and incompressible

Answer A

Question An equipotential line is __________ to the streamline at every point.

A NormalB ParallelC TangentialD None of these

Answer A

Question Steady fluid flow occur when the derivative of flow variables satisfy the following condition.

A ∂v/∂t=0B ∂v/∂t=1C ∂x/∂t=0D ∂t/∂s=0

Answer C

Question Unsteady non-uniform flow is represented by flow through an

A Long pipe at constant rate.B Long pipe at decreasing rateC Expanding tube at increasing rate.

D Expanding tube at constant rate.

Answer A

Question Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.

A ∂s/∂t=0B ∂v/∂t=0C ∂x/∂t=0D ∂t/∂s=0

Answer B

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 flowB unsteady ,non-uniform flowC steady ,uniform flowD 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 velocity gradient normal to the direction of flow

Answer A

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 unitsB 8 unitsC 16 unitsD 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/sB 12 m/sC 24 m/sD 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 unitC √1.5 unitD √2.5 unit

Answer B

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 D

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 C

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 8 units B 16 units C 20 units D 36 units

Answer A

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 B

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 correctD 1,3 and 4 are correct

Answer B

Question If Φ=x(2y-1)find the velocity at (-3,-5)

A 12.04 unitsB 12.52 unitsC 18.06 unitsD 5.55units

Answer 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 2.5 m/s B 41.8 C 62.5 D 1784.25

Answer C

Question Which one of the following velocity fields represents a possible fluid flow?A u = x; v = yB u = xy; v = x2y2

C u = x; v = - yD u = x2; v= y2

Answer D

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 B

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 A

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 Parallel to y axis in downward directionB Parallel to Parallel to x axis C Concentric circleD Normal to y-axis in upward direction

Answer 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 C

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/sB 20.83m/sC 21.63m/sD 12.58m/s

Answer B

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/sA 5 m/s2&22.25 m/s2

B 0 & -42.76m/s2

C 0.5m/s2

D 0 &0.15 m/s2

Answer D

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 12.5 m/s&15.56m/sB 1.83m/s&0.85m/sC 2.83 m/s&1.5m/sD 4.83 m/s &1.25m/s

Answer D

.

Question The red lines shown indicates -----A Stream line B Streak line C Path line D None of the above

Answer B

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 beA 1.4B 1.0C 0.4D 0.667

Answer C

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 beA 3B 8C 15D 24

Answer B

Question

In the figure the line joining the points is called as


Answer B

Question A stream function is give by(x 2- y 2) the potential function of the flow will be

A 2xy + f(x)B 2xy + constantC 2(x2- y2) D 2Xy + f(y)

Answer B

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 183.5mmB 52.4mmC 5.24mmD 73.4mm

Answer A

Question The fig shows ----

A Stream tube which is a fluid mass bounded by a group of stream lines.

B Pipe consisting of network of potential lines .C Pipe consisting of network of path lines D None of the above

Answer C

Question The flow through pipe shown in figure is a---

A One dimensional flowB Two dimensional flowC Three dimensional flowD Four dimensional flow

Answer A

Question The flow through pipe shown in figure is

A Laminar flow B Turbulent flow C Transitional flow D None of the above

Answer B

Question The flow through pipe shown in figure is

A Laminar flow B Turbulent flow C Transitional flow D None of the above

Answer B

Question The path taken by smoke coming out of chimney shows ----lines


Answer A

Question The velocity components in x and y directions in terms of velocity potential Φ are

A u= - ∂Φ/∂x, v= - ∂Φ/∂yB u= ∂Φ/∂x, v= - ∂Φ/∂yC u= ∂Φ/∂y, v= ∂Φ/∂xD u= - ∂Φ/∂x v= ∂Φ/∂y

Answer A

Question The velocity components in x and y directions in terms of stream

function Ψ areA u= - ∂Ψ/∂y, v= ∂Ψ/∂xB u= ∂Ψ/∂x, v= ∂Ψ/∂yC u= ∂Ψ/∂y, v= ∂Ψ/∂xD u=- ∂Ψ/∂x, v= ∂Ψ/∂y

Answer D

Question Which of the following statement is false for two-dimensional flow field ?A If Φexists, Ψ will also existB If Ψexists, Φ will also existC If Φ exists the flow will be rotationalD If Ψ exists flow will be either rotational or irrotational.

Answer D

Question The figure illustrates

A Pure or linear translation of fluid particlesB Linear motion with deformation fluid particlesC Rotational motion fluid particlesD Angular deformation fluid particles

Answer A

Question The flow pattern represented in fig (a),(b) &(c) can be expressed respectively as

A y=c, x=c &y= mx+cB y=f(x), x=y2&y= mx+c C y=mx c,x=y2& x= my+cD y= 0,x=0 &y= x2

Answer B

Question The flow pattern represented in fig (d) and (e) can be expressed respectively as -

A y=c, y= mx+cB y= f(x), x2+y2=c C y=mx ,x=y2& x= my+cD y= x&y= x2

Answer C

Question The figure shows 2 pipes of different size. Find the loss of energy between section (1) &(2)

A 1.276 kg-mB 1.00 kg-mC 0,725 kg-mD 0.15 kg-m

Answer C

Question An elbow nozzle assembly shown in figure is in a horizontal plane .The velocity of flow from nozzle is

A 4 m/sB 16 m/sC 24 m/sD 30 m/s

Answer A

Question The component of velocity u and v along x and y directions in a 2D incompressible fluid areA u=x2cos y ; v=2x sinyB u= x+2; v=1-yC u=xyt; v=x3– y2t/2D U= ln x+ y; v= xy – y/x

Answer C

Question A flow in a 2D was represented by mesh consisting of intersection of the two lines. The graphical representation is known as

A Intersection of flow and potential lineB Intersection of velocity and flow linesC Flow netD None of the above

Answer C

Question The flow net shown in figure is drawn for

A Retarding flow through converging boundariesB Accelerating flow through Diverging boundariesC Accelerating flow through converging boundariesD 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 sameB moreC lessD More or less depending on temperature

Answer D

Question For a flow through a horizontal pipe, the pressure gradient in the flow direction is

A +veB 1C zeroD -ve

Answer C

Question The differential manometer connected to pitot static tube used for measuring fluid velocity gives

A Static pressureB Total pressureC Dynamic pressureD Difference between total and dynamic pressure

Answer A

Question The realization of velocity potential in fluid flow indicates that the A Flow must be irrotationalB Circulation around any close curve must have a finite valueC Flow is rotational and and satisfy the contunity equationD Vorticity must be non zero

Answer A



Answer A

Question In a 2-D flow in a x-y plane, if ∂u/∂y =∂v/∂x then fluid element will undergoA Translation onlyB Translation and rotationC Translation and deformationD Rotation and deformation

Answer D

Question Path line can cross the stream line at right angles when flow is

A rotationalB Irrotational and unsteadyC Irrotational and steadyD Unsteady

Answer C

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

C Both A &BD None of the above

Answer B

Question The method of drawing flow net by graphical method

A Velocity potential lines are drawn first B Streamlines are drawn firstC Velocity potential lines and stream lines are drawn

simultaneouslyD None of the above

Answer A

Question If u=2yz+t2 , v=x2z-t, w=xy2,find the acceleration along ax at point(2,1,2) direction at time t=1secA 30 m/s2

B 28.5 m/s2

C 15 m/s2

D 20.5 m/s2

Answer B

Question Flow is represented by the stream function Ψ =xy. the velocity components u and v are------and flow is --------

A U=x2,v=y2 and rotationalB u=x, v=-y and flow is irrotationalC u=x, v=-y and flow is rotationalD none of these

Answer D

Question A flow is represented by a group of concentric streamlines as shown in fig. The type of acceleration in such flow is

A Local AccelerationB Total AccelerationC No accelerationD Convective normal acceleration

Answer B

Question The magnitude of the component of velocity at a point (1,1) for a stream function ψ=x2-y2 is equal to

A 2B 2√2 C 4D 4√2

Answer C

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 D

Question Stream function y = uy –vx represents A free vortex motion B uniform flow parallel to x axisC uniform flow parallel to y axis D uniform flow inclined to x axis

Answer D

Question For the streamline shown if fig the type of acceleration applicable is

A Convective accelerationB Local AccelerationC Total AccelerationD No acceleration

Answer A

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 pipeA 1 &2B 2C 1 D 1 &4

Answer B

Question A flow through a long pipe at varying rate is called __________ uniform flow.

A steadyB unsteadyC One dimensional flowD Rotational flow

Answer C

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

A Steady flowB Uniform flow.C Streamline flowD Turbulent flow

Answer D

Question A stream line isA The line of equal velocity in a flowB The line along which the rate of pressure drop is

uniformC The line along the geometrical center of the flow

D Fixed in space in steady flow.

Answer C

Question Separation of flow occurs due to reduction of pressure gradient to

A ZeroB Negligibly low valueC The extent such that vapour formation starts

D None of the above.

Answer B

Question A flow through an expanding tube at constant rate is called

A Steady uniform flowB Steady non-uniform flowC Unsteady uniform flowD Unsteady non-uniform flow

Answer C

Question The continuity equationA Expresses the relationship between work and energyB Relates the momentum per unit volume between two points

on a stream lineC Relates mass rate of flow along a stream lineD 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 flowB Two dimensional flowC Three dimensional flowD None of these

Answer B



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


Answer A

Question A flow, in which the quantity of liquid flowing per second is constant, is

called __________ flow.A SteadyB StreamlineC TurbulentD 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 The pressure is higher inside the contracted section

C The fluid slows down as it passes through the contracted section

D None of the above

Answer A

Question The resistance wire used in a hot wire anemometer for conducting electrical current is made of

A CopperB TungstenC ChromiumD Aluminum

Answer B

Question A steady uniform flow is through

A A long pipe at decreasing rate

B A long pipe at constant rateC An expanding tube at constant rate

D An expanding tube at increasing rate

Answer C

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 anA Long pipe at constant rate.B Expanding tube at increasing rate.

C Expanding tube at constant rate.

D None of above

Answer B

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 LaminarB Turbulent flowC Uniform flowD Non-uniform flow

Answer D

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 RotationB TranslationC Linear deformationD Angular deformation

Answer A

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

C Frictional loss in the particular length of the pipe will the more than the drop in its elevation

D Frictional loss in the particular length of the pipe, will be less than the drop in elevation.

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 None of above

Answer A

Question Equation of continuity of flow is based on the principle of conservation of

A MassB MomentumC ForceD None of these.

Answer C

Question For an irrotational motionA the fluid elements do not undergo a circular motionB the velocity is constant at every point in the flow fieldC the fluid particles do not rotate about their mass centres while moving along a streamlineD the fluid elements do not experience any shear.

Answer C

Question Flow is rotational if theA fluid element undergoes linear deformationB fluid element undergoes angular deformationC fluid element undergoes net rotation in a plane about an axis

normal to the planeD flow takes place in a circular path.

Answer B

Question During the opening of a valve, the flow isA laminarB unsteadyC uniformD rotational.

Answer B

Question Mark the wrong statement:A streamlines cannot start or end anywhere

except at the interface or infinityB streamline spacing varies directly as the flow velocityC streamlines can meet at a stagnation point where

the velocity is zeroD the flow is only possible in direction of falling velocity potential

Answer D

Question For a two-dimensional flow field, the equation of a streamline is given as

A u/dx=dy/vB du/dx= dv/ dy/=0C dy/u= dx/vD dx/u= dy/v

Answer D

Question The flow-net analysis can be used to determineA quantity of seepage and upward lift pressB 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, rotationalB steady, compressible, irrotationalC unsteady, incompressible, rotationalD Steady, incompressible, irrotational.

Answer A

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 functionB Stream functionC CirculationD Vorticity.

Answer C

Question Body perfume is sprayed. The flow of spray mist so generated will represent,

A Path lineB StreamlineC Streak lineD flow line

AnswerD QuestionIn steady flow, which one of the following changes with time AVelocity BPressure...

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Transcript of AnswerD QuestionIn steady flow, which one of the following changes with time AVelocity BPressure...