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Recent questions and answers in Fluid Mechanics
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GATE2019 ME2: 9
A twodimensional incompressible frictionless flow field is given by $\overrightarrow{u} = x \hat{i} – y \hat{j}$. If $\rho$ is the density pf 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})$
asked
Feb 9
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Fluid Mechanics
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Arjun
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21.2k
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gate2019me2
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ISRO200911
The transition Reynolds number for flow over a flat plate is $5^*10^5$. What is the distance from the leading edge at which transition will occur for flow of water with a uniform velocity of $1 \: m/s$? (For water, the kinematic viscosity $v=0.86^*10^{6} \:m^2/s$) $0.43 \: m$ $1 \: m$ $43 \: m$ $103 \: m$
asked
Mar 6, 2018
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Fluid Mechanics
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m2n037
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940
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isro2009
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ISRO20098
The pressure drop for a relatively low Reynolds number flow in a $600 \: mm, \: 30 \: m$ long pipeline is $70 \: kPa$. What is the wall shear stress? $0 \: Pa$ $1400 \: Pa$ $700 \: Pa$ $350 \: Pa$
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Mar 6, 2018
in
Fluid Mechanics
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m2n037
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940
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isro2009
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ISRO20097
A metallic cube of side $10 \: cm$, density $6.8 \: gm/cc$ is floating in liquid mercury (density $13.6 \: gm/cc$), with $5 \: cm$ height of cube exposed above the mercury level. Water (density $1 \: gm/cc$) is filled over this, to submerge the cube fully. The new height of cube exposed above mercury level is $4.6 \: cm$ $5.4 \: cm$ $5.0 \: cm$ $5.8 \: cm$
asked
Mar 6, 2018
in
Fluid Mechanics
by
m2n037
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940
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isro2009
0
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ISRO20095
Across a normal shock Static pressure and the static temperature rise entropy remains constant velocity and static pressure decrease density and temperature decrease
asked
Mar 6, 2018
in
Fluid Mechanics
by
m2n037
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940
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isro2009
0
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ISRO20092
If the stream function is given by $\Psi=3xy$, then the velocity at a point $(2,3)$ will be $7.21 \: \text{unit}$ $18 \: \text{unit}$ $10.82 \: \text{unit}$ $54 \: \text{unit}$
asked
Mar 6, 2018
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Fluid Mechanics
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m2n037
(
940
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isro2009
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ISRO20091
A hydraulic press has a ram of $15 \: cm$ diameter and plunger of $1.5 \: cm$. It is required to lift a mass of $1000 \: kg$. The force required on plunger is nearly equal to $100 \: N$ $1000 \: N$ $10000 \: N$ $10 \: N$
asked
Mar 6, 2018
in
Fluid Mechanics
by
m2n037
(
940
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isro2009
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GATE2018240
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).
asked
Feb 17, 2018
in
Fluid Mechanics
by
Arjun
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21.2k
points)
gate2018me2
0
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GATE2018234
Air flows at the rate of $1.5 \: m^3/s$ through a horizontal pipe with a gradually reducing crosssections as shown in the figure. The two crosssections of the pipe have diameters of the $400 \: mm$ and $200 \: mm$. Take the air density as $1.2 \: kg/m^3$ and assume ... flow. The change in pressure $(p_2p_1)$ (in $kPa$) between sections 1 and 2 is $1.28$ $2.56$ $2.13$ $1.28$
asked
Feb 17, 2018
in
Fluid Mechanics
by
Arjun
(
21.2k
points)
gate2018me2
0
votes
0
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GATE2018222
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).
asked
Feb 17, 2018
in
Fluid Mechanics
by
Arjun
(
21.2k
points)
gate2018me2
0
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GATE2018143
A solid block of $2.0 \: kg$ mass slides steadily at a velocity $V$ along a vertical wall as shown in the figure below. A thin oil film of thickness $h=0.15 \: mm$ provides lubrication between the block and the wall. The surface area of the face of the block ... $V$ (in $m/s$) of the block is ______ (correct to one decimal place)
asked
Feb 17, 2018
in
Fluid Mechanics
by
Arjun
(
21.2k
points)
gate2018me1
0
votes
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GATE2018142
A sprinkler shown in the figure rotates about its hinge point in a horizontal plane due to water flow discharged through its two exit nozzles. The total flow rate Q through the sprinkler is 1 litre/sec and the crosssectional area of each exit nozzle is ... hinge, the steady state sngular speed of rotation (in rad/s) of the sprinkler is ______ (correct to two decimal places)
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Feb 17, 2018
in
Fluid Mechanics
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Arjun
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21.2k
points)
gate2018me1
0
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GATE2018134
IN a Lagrangian system, the position of a fluid particle in a flow is described as $x=x_0e^{kt}$ and $y=y_oe^{kt}$ where $t$ is the time while $x_o, \: y_o$, and $k$ are constants. The flow is unsteady and onedimensional steady and twodimensional steady and onedimensional unsteady and twodimensional
asked
Feb 17, 2018
in
Fluid Mechanics
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Arjun
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21.2k
points)
gate2018me1
0
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GATE2018133
A tank open at the top with a water level of 1 m, as shown in the figure, has a hole at a height of 0.5 m. A free jet leaves horizontally from the smooth hole. The distance X (in m) where the jet strikes the floor is 0.5 1.0 2.0 4.0
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Feb 17, 2018
in
Fluid Mechanics
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Arjun
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21.2k
points)
gate2018me1
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GATE201819
For a wodimensional incompressible flow field given by $\overrightarrow{u} = A(x \hat{i}  y \hat{j}), \text{ where } A>0$, which one of the following statements is FALSE? It satisfies continuity equation It is unidirectional when $x \rightarrow 0$ and $y \rightarrow \infty$ Its streamlines are given by $x=y$ It is irrotational
asked
Feb 17, 2018
in
Fluid Mechanics
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Arjun
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21.2k
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gate2018me1
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