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Recent questions and answers in Fluid Mechanics
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GATE2020-ME-2: 14
Which of the following conditions is used to determine the stable equilibrium of all partially submerged floating bodies? Centre of buoyancy must be above the centre of gravity Centre of buoyancy must be below the centre of gravity Metacentre must be at a higher level than the centre of gravity Metacentre must be at a lower level than the centre of gravity
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Fluid Mechanics
Sep 18, 2020
by
go_editor
5.0k
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gateme-2020-set2
stability-of-floating-bodies
fluid-mechanics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 16
A closed vessel contains pure water, in thermal equilibrium with its vapour at $25^\circ C$(Stage$\#1$ ... Valve $A$ Nothing will happen - the vessel will continue to remain in equilibrium All the vapor inside the vessel will immediately condense
go_editor
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in
Fluid Mechanics
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
fluid-mechanics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 49
Water (density $1000 \: kg/m^3$) flows through an inclined pipe of uniform diameter. The velocity, pressure and elevation at section $\textbf{A}$ are $V_A=3.2 \: m/s, \: p_A=186 \text{kPa}$ and $z_A=24.5 \: m$ ... acceleration due to gravity is $10 \: m/s^2$ then the head lost due to friction is ________ $m$ (round off to one decimal place)
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asked
in
Fluid Mechanics
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
fluid-mechanics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-2: 51
Water flows through a tube of $3$ cm internal diameter and length $20$ m. The outside surface of the tube is heated electrically so that it is subjected to uniform heat flux circumferentially and axially. The mean inlet and exit temperatures of the water are ... The inner surface temperature at the exit section of the tube is ___________ $^\circ C$ (round off to one decimal place
go_editor
asked
in
Fluid Mechanics
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
fluid-mechanics
fluid-mechanics-and-thermal-science
1
answer
1
vote
Self doubt
With increase in pressure the bulk modulus of elasticity__?
nadim96
answered
in
Fluid Mechanics
Jul 3, 2020
by
nadim96
210
points
0
answers
0
votes
GATE2020-ME-1: 14
Froude number is the ratio of buoyancy forces to viscous forces inertia forces to viscous forces buoyancy forces to inertia forces inertia forces to gravity forces
go_editor
asked
in
Fluid Mechanics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
buoyancy
0
answers
0
votes
GATE2020-ME-1: 15
Match the following non-dimensional numbers with the corresponding definitions: ... $P-3, Q-1, R-2, S-4$ $P-4, Q-3, R-1, S-2$ $P-3, Q-1, R-4, S-2$
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asked
in
Fluid Mechanics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2020-ME-1: 16
The velocity field of an incompressible flow in a Cartesian system is represented by $\overrightarrow{V}=2\left ( x^{2}-y^{2} \right )\widehat{i}+v\widehat{j}+3\widehat{k}$ Which one of the following expressions for $v$ is valid? $-4xz + 6xy$ $ – 4xy – 4xz$ $4xz – 6xy$ $4xy + 4xz$
go_editor
asked
in
Fluid Mechanics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2020-ME-1: 49
Consider steady, viscous, fully developed flow of a fluid through a circular pipe of internal diameter $\text{D}$. We know that the velocity profile forms a paraboloid about the pipe centre line, given by: $V=-C\left(r^{2}-\dfrac{D^{2}}{4}\right) m/s$ ... the control surface $\text{A-B}$, as shown in the figure, is proportional to $D^{n}$. The value of $n$ is ________.
go_editor
asked
in
Fluid Mechanics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
0
answers
0
votes
GATE2020-ME-1: 50
Air discharges steadily through a horizontal nozzle and impinges on a stationary vertical plate as shown in figure. The inlet and outlet areas of the nozzle are $0.1\:m^{2}\:\text{and}\:0.02\:m^{2}$ ... is $0.36\:kPa$, the gauge pressure at point $O$ on the plate is __________ $kPa$ (round off to two decimal places).
go_editor
asked
in
Fluid Mechanics
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2019 ME-2: 9
A two-dimensional incompressible frictionless flow field is given by $\overrightarrow{u} = x \hat{i} – y \hat{j}$. If $\rho$ is the density of the fluid, the expression for pressure gradient vector at any point in the flow field is given as $\rho(x \hat{i}+y \hat{j})$ $ – \rho(x \hat{i}+y \hat{j})$ $\rho(x \hat{i} – y \hat{j})$ $ – \rho(x^2 \hat{i}+y^2 \hat{j})$
Arjun
asked
in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
fluid-mechanics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2019 ME-2: 23
Water enters a circular pipe of length $L=5.0$ m and diameter $D=0.20$m with Reynolds number $Re_D=500$. The velocity profile at the inlet of the pipe is uniform while it is parabolic at the exit. The Reynolds number at the exit of the pipe is _________
Arjun
asked
in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
0
answers
0
votes
GATE2019 ME-2: 43
Water flows through two different pipes $A$ and $B$ of the same circular cross-section but at different flow rates. The length of pipe $A$ is $1.0 \: m$ and that of pipe $B$ is $2.0 \: m$. The flow in both the pipes is laminar and fully ... head loss across the length of the pipes is same, the ratio of volume flow rates $Q_B/Q_A$ is __________ (round off to two decimal places).
Arjun
asked
in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
0
answers
0
votes
GATE2019 ME-2: 44
The aerodynamic drag on a sports car depends on its shape. The car has a drag coefficient of $0.1$ with the windows and the roof closed. With the windows and the roof open, the drag coefficient becomes $0.8$. The car travels at $44$ km/h with the ... round off to two decimal places), is __________ $km/h$ (The density of air and the frontal area may be assumed to be constant).
Arjun
asked
in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
numerical-answers
fluid-mechanics
0
answers
0
votes
GATE2019 ME-2: 47
Water flowing at the rate of $1$ kg/s through a system is heated using an electric heater such that the specific enthalpy of the water increases by $2.50 \: kJ/kg$ and the specific entropy increases by $0.007 \: kJ/kg \cdot K$. The power input ... an ambient temperature of $300 \: K$, the irreversibility rate of the system is __________ $kW$ (round off to two decimal places).
Arjun
asked
in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
0
answers
0
votes
GATE2019 ME-2: 48
An idealized centrifugal pump (blade outer radius of $50 \: mm$) consumes $2 \: kW$ power while running at $3000 \: rpm$. The entry of the liquid into the pump is axial and exit from the pump is radial with respect to impeller. If the losses are neglected, then the mass flow rate of the liquid through the pump is ___________ $kg/s$ (round off to two decimal places)
Arjun
asked
in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2019 ME-1: 9
For a hydrodynamically and thermally fully developed laminar flow through a circular pipe of constant cross-section, the Nusselt number at constant wall heat flux $(Nu_q)$ and that at constant wall temperature $(Nu_T)$ are related as $Nu_q > Nu_T$ $Nu_q < Nu_T$ $Nu_q = Nu_T$ $Nu_q = (Nu_T)^2$
Arjun
asked
in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
0
answers
0
votes
GATE2019 ME-1: 23
Water flows through a pipe with a velocity given by $\overrightarrow{V}= \bigg( \dfrac{4}{t}+x+y \bigg) \hat{j} \: m/s$, where $\hat{j}$ is the unit vector in the $y$ direction, $t(>0)$ is in seconds, and $x$ and $y$ are in meters. The magnitude of total acceleration at the point $(x,y)=(1,1)$ at $t=2\: s$ is ______$m/s^2$
Arjun
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in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
0
answers
0
votes
GATE2019 ME-1: 32
The wall of a constant diameter pipe of length $1 \: m$ is heated uniformly with flux $q''$ by wrapping a heater coil around it. The flow at the inlet to the pipe is hydrodynamically fully developed. The fluid is incompressible and the flow is assumed to be laminar and ... the location P, Q and R, the flow is thermally developed at P, Q and R P and Q only Q and R only R only
Arjun
asked
in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
fluid-mechanics-and-thermal-science
fluid-mechanics
flow-through-pipes
0
answers
0
votes
GATE2019 ME-1: 45
Two immiscible, incompressible, viscous fluids having same densities but different viscosities are contained between two infinite horizontal parallel plates, $2 \: m$ apart as shown below. The bottom plate is fixed and the upper plate moves to the right with a constant ... fluid, $\mu_1$, then the velocity at the interface (round off to two decimal places) is _______ $m/s$.
Arjun
asked
in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2019 ME-1: 46
A cube of side $100 \: mm$ is placed at the bottom of an empty container on one of its faces. The density of the material of the cube is $800 \: kg/m^3$. Liquid of density $1000 \: kg/m^3$ is now poured into the container. The minimum height to which the liquid needs to be poured into the container for the cube to just lift up is __________$mm$.
Arjun
asked
in
Fluid Mechanics
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE ME 2012 | Question: 40
A large tank with a nozzle attached contains three immiscible, inviscid fluid as shown. Assuming that the changes in $h_1, h_2$ and $h_3$ ...
Andrijana3306
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in
Fluid Mechanics
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE ME 2012 | Question: 29
Consider two infinitely long thin concentric tubes of circular cross section as shown in the figure. If $D_1$ and $D_2$ are the diameters of the inner and outer tubes respectively, then the view factor $F_{22}$ is given by $\bigg( \dfrac{D_1}{D_2} \bigg) -1 \\$ $\text{zero} \\$ $\bigg( \dfrac{D_1}{D_2} \bigg) \\$ $1- \bigg( \dfrac{D_1}{D_2} \bigg)$
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Fluid Mechanics
Mar 20, 2018
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Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE ME 2012 | Question: 30
An incompressible fluid flows over a flat plate with zero pressure gradient. The boundary layer thickness is $1$ mm at a location where the Reynolds number is $1000$. If the velocity of the fluid alone is increased by a factor of $4$, then the boundary layer thickness at the same location, in mm will be $4$ $2$ $0.5$ $0.25$
Andrijana3306
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Fluid Mechanics
Mar 20, 2018
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Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
boundary-layer
0
answers
0
votes
GATE ME 2012 | Question: 17
The velocity triangles at the inlet and exit of the rotor of a turbomachine are shown. $V$ denotes the absolute velocity of the fluid, $W$ denotes the relative velocity of the fluid and $U$ denotes the blade velocity. Subscripts $1$ and $2$ refer to inlet and outlet respectively. If $V_2 =W_1$ and $V_1=W_2$, then the degree of reaction is $0$ $1$ $0.5$ $0.25$
Andrijana3306
asked
in
Fluid Mechanics
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE ME 2012 | Question: 19
An ideal gas of mass $m$ and temperature $T_1$ undergoes a reversible isothermal process from an initial pressure $P_1$ to final pressure $P_2$. The hear loss during the process is $Q$. The entropy change $\Delta S$ ... $mR \: \ln \bigg( \dfrac{P_2}{P_1} \bigg) - \dfrac{Q}{T_1} \\$ $\text{zero}$
Andrijana3306
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Fluid Mechanics
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE ME 2012 | Question: 10
A thin walled spherical shell is subjected to an internal pressure. If the radius of the shell is increased by $1 \%$ and the thickness is reduced by $1 \%$ with the internal pressure remaining the same, the percentage change in the circumferential (hoop) stress is $0$ $1$ $1.08$ $2.02$
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Fluid Mechanics
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE ME 2012 | Question: 5
Oil flows through a $200$ mm diameter horizontal cast iron pipe (friction factor, $f=0.0225$) of length $500 m$. The volumetric flow rate is $0.2 \: m^3/s$. The head loss (in m) due to friction is (assume $g=9.81 m/s^2$) $116.18$ $0.116$ $18.22$ $232.36$
Andrijana3306
asked
in
Fluid Mechanics
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
head-losses-in-pipes
0
answers
0
votes
GATE ME 2012 | Question: 6
For an opaque surface, the absorptivity ($\alpha$), transmissivity ($\tau$) and reflectivity ($\rho$) are related by the equation $\alpha + \rho = \tau$ $\rho + \alpha + \tau =0$ $\alpha + \rho =1$ $\alpha + \rho =0$
Andrijana3306
asked
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Fluid Mechanics
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE ME 2012 | Question: 1
In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate increases continuously decreases continuously decreases, becomes stable and then increases increases, becomes stable and then decreases
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Fluid Mechanics
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
ISRO2009-11
The transition Reynolds number for flow over a flat plate is $5\ast 10^5$. What is the distance from the leading edge at which transition will occur for flow of water with a uniform velocity of $1 \: \text{m/s}?\;($For water, the kinematic viscosity $v=0.86 \ast 10^{-6} \:\text{m}^2\text{/s})$ $0.43\;\text{m}$ $1\;\text{m}$ $43\;\text{m}$ $103\;\text{m}$
m2n037
asked
in
Fluid Mechanics
Mar 6, 2018
by
m2n037
940
points
isro2009
0
answers
0
votes
ISRO2009-8
The pressure drop for a relatively low Reynolds number flow in a $600 \: \text{mm}, \: 30 \: \text{m}$ long pipeline is $70 \;\text{kPa}$. What is the wall shear stress? $0 \;\text{Pa}$ $1400 \;\text{Pa}$ $700 \;\text{Pa}$ $350 \;\text{Pa}$
m2n037
asked
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Fluid Mechanics
Mar 6, 2018
by
m2n037
940
points
isro2009
0
answers
0
votes
ISRO2009-7
A metallic cube of side $10 \;\text{cm}$, density $6.8 \: gm/cc$ is floating in liquid mercury (density $13.6 \: \text{gm/cc}$), with $5 \;\text{cm}$ height of cube exposed above the mercury level. Water (density $1 \: \text{gm/cc}$) is filled over this, to submerge the cube ... of cube exposed above mercury level is $4.6 \;\text{cm}$ $5.4 \;\text{cm}$ $5.0 \;\text{cm}$ $5.8 \;\text{cm}$
m2n037
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Fluid Mechanics
Mar 6, 2018
by
m2n037
940
points
isro2009
0
answers
0
votes
ISRO2009-5
Across a normal shock Static pressure and the static temperature rise entropy remains constant velocity and static pressure decrease density and temperature decrease
m2n037
asked
in
Fluid Mechanics
Mar 6, 2018
by
m2n037
940
points
isro2009
0
answers
0
votes
ISRO2009-2
If the stream function is given by $\Psi=3xy$, then the velocity at a point $(2,3)$ will be $7.21 \: \text{unit}$ $18 \: \text{unit}$ $10.82 \: \text{unit}$ $54 \: \text{unit}$
m2n037
asked
in
Fluid Mechanics
Mar 6, 2018
by
m2n037
940
points
isro2009
0
answers
0
votes
ISRO2009-1
A hydraulic press has a ram of $15 \: \text{cm}$ diameter and plunger of $1.5 \: \text{cm}$. It is required to lift a mass of $1000 \: \text{kg}$. The force required on plunger is nearly equal to $100\;\text{N}$ $1000\;\text{N}$ $10000\;\text{N}$ $10\;\text{N}$
m2n037
asked
in
Fluid Mechanics
Mar 6, 2018
by
m2n037
940
points
isro2009
1
answer
0
votes
GATE2018-1-22
A flat plate of width $L=1 \: m$ is pushed down with a velocity $U=0.01 \: m/s$ towards a wall resulting in the drainage of the fluid between the plate and the wall as sown in the figure. Assume two-dimensional incompressible flow and that the plate remains ... $m/s$) draining out at the instant shown in the figure is ____ (correct to three decimal places).
kmlshvshwkrm
answered
in
Fluid Mechanics
Feb 26, 2018
by
kmlshvshwkrm
140
points
gateme-2018-set1
numerical-answers
fluid-mechanics-and-thermal-science
fluid-mechanics
0
answers
0
votes
GATE2018-2-40
A frictionless circular piston of area $10^{-2} \: m^2$ and mass $100 \: kg$ sinks into a cylindrical container of the same area filled with water of density $1000 \: kg/m^3$ ... water to be incompressible, the magnitude of the piston velocity (in $m/s$) at the instant shown is _____ (correct to three decimal places).
Arjun
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Fluid Mechanics
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set2
numerical-answers
0
answers
0
votes
GATE2018-2-34
Air flows at the rate of $1.5 \: m^3/s$ through a horizontal pipe with a gradually reducing cross-section as shown in the figure. The two cross-sections of the pipe have diameters of the $400 \: mm$ and $200 \: mm$. Take the air density as $1.2 \: kg/m^3$ and assume inviscid ... change in pressure $(p_2-p_1)$ (in $kPa$) between sections $1$ and $2$ is $-1.28$ $2.56$ $- 2.13$ $1.28$
Arjun
asked
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Fluid Mechanics
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set2
0
answers
0
votes
GATE2018-2-22
The viscous laminar flow of air over a flat plate results in the formation of a boundary layer. The boundary layer thickness at the end of the plate of length $L$ is $\delta_L$. When the plate length is increased to twice its original length, the ... laminar boundary layer thickness at the end of the plate (with respect to $\delta_L$ is _______ (correct to two decimal palces).
Arjun
asked
in
Fluid Mechanics
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set2
numerical-answers
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