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Recent questions and answers in Fluid Mechanics and Thermal Sciences
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ISRO200911
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Mar 6, 2018
in
Fluid Mechanics
by
m2n037
(
1.4k
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isro2009
0
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ISRO200910
asked
Mar 6, 2018
in
Applications
by
m2n037
(
1.4k
points)
isro2009
0
votes
0
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ISRO20099
asked
Mar 6, 2018
in
Heat Transfer
by
m2n037
(
1.4k
points)
isro2009
0
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ISRO20098
asked
Mar 6, 2018
in
Fluid Mechanics
by
m2n037
(
1.4k
points)
isro2009
0
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ISRO20097
asked
Mar 6, 2018
in
Fluid Mechanics
by
m2n037
(
1.4k
points)
isro2009
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ISRO20096
asked
Mar 6, 2018
in
Applications
by
m2n037
(
1.4k
points)
isro2009
0
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ISRO20095
asked
Mar 6, 2018
in
Fluid Mechanics
by
m2n037
(
1.4k
points)
isro2009
0
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ISRO20094
asked
Mar 6, 2018
in
Heat Transfer
by
m2n037
(
1.4k
points)
isro2009
0
votes
0
answers
ISRO20093
asked
Mar 6, 2018
in
Applications
by
m2n037
(
1.4k
points)
isro2009
0
votes
0
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ISRO20092
asked
Mar 6, 2018
in
Fluid Mechanics
by
m2n037
(
1.4k
points)
isro2009
0
votes
0
answers
ISRO20091
asked
Mar 6, 2018
in
Fluid Mechanics
by
m2n037
(
1.4k
points)
isro2009
0
votes
0
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GATE2018254
Steam in the condenser of a thermal power plant is to be condensed at a temperature of $30^oC$ with cooling water which enters the tubes of the condenser at $14^oC$ and exists at $22^oC$. The total surface area of the tubes is $50 \: m^2$, and the overall heat ... is $2000 \: W/m^2 \: K$. The heat transfer (in $MW$) to the condenser is _____ (correct to two decimal places).
asked
Feb 17, 2018
in
Heat Transfer
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
GATE2018255
A vehicle powered by a spark ignition engine follows air standard Otto cycle ($\gamma =1.4$). The engine generates 70 kW while consuming 10.3 kg/hr of fuel. The calorific value of the fuel is 44,000 kJ/kg. The compression ratio is _______ (correct to two decimal places.
asked
Feb 17, 2018
in
Applications
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
GATE2018245
A test is conducted on a onefifth scale model of a Francis turbine under a head of $2 \: m$ and volumetric flow rate of $1 \: m^3/s$ at $450 \: rpm$. Take the water density and the acceleration due to gravity as $10^3 \: kg/m^3$ ... turbines. The power (in$MW$) of a full sized turbine while working under a head of $30 ]: m$ is _______ (correct to two decimal places)
asked
Feb 17, 2018
in
Applications
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
GATE2018244
Ambient air is at a pressure of $100 \: kPa$, dry bulb temperature at $30^o C$ and $60%$ relative humidity. The saturation pressure of water at $30^o C$ id $4.24 \: kPa$. The specific humidity of air (in $g/kg$ of dry air) is _______ (correct to two decimal places).
asked
Feb 17, 2018
in
Thermodynamics
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
GATE2018243
A standard vapor compression refrigeration cycle operating with a condensing temperature of $35^oC$ and an evaporating temperature of $10^oC$ develops $15 \: kW$ of cooling. The $ph$ diagram shows teh enthalpies at various states. If the isentropic efficiency of the compressor is $0.75$, the magnitude of compressor power (in $kW$) is _________ (correct to two decimal places)
asked
Feb 17, 2018
in
Thermodynamics
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
GATE2018242
Air is held inside a noninsulated cylinder using a piston (mass $M=25 \: kg$ and area $A=100 \: cm^2$) and stoppers (of negligible area), as shown in the figure. The initial pressure $Pi$ and temperature $T_i$ ... The temperature of the air inside the cylinder ($^oC$) at which the piston will begin to move is ______ (correct to two decimal places).
asked
Feb 17, 2018
in
Applications
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
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
(
21.5k
points)
gate20182
0
votes
0
answers
GATE2018241
A $0.2 \:m$ thick infinite black plate having a thermal conductivity of $3.96 \: W/mK$ is exposed to two infinite black surfaces at $300 \: K$ and $400 \: K$ as shown in the figure. At steady state, the surface temperature of teh plate facing the ... $1D$ heat conduction, the magnitude of the heat flux through the place (in $W/m^2$) is ______ (correct to two decimal places)
asked
Feb 17, 2018
in
Heat Transfer
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
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
(
21.5k
points)
gate20182
0
votes
0
answers
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
(
21.5k
points)
gate20182
0
votes
0
answers
GATE2018223
An engine operates on the reversible cycle as shown in the figure. The work output from the engine (in ($kJ/cycle$) is ____ (correct to two decimal places).
asked
Feb 17, 2018
in
Applications
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
GATE201829
The peak wavelength of radiation emitted by a black body at a temperature of $2000 \: K$ is $1.45 \: \mu m$. If the peak wavelength of emitted radiation changes to $2.90 \: \mu m$, then the temperature (in $K$) of teh black body is 500 1000 4000 8000
asked
Feb 17, 2018
in
Heat Transfer
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
GATE2018210
For an ideal gas with constant properties undergoing a quasistatic process, which one of the following represents the change of entropy $(\Delta s$) from state 1 to 2? $\Delta s = C_p \text{ln} \bigg( \frac{T_2}{T_1} \bigg)  R\text{ln} \bigg( \frac{P_2}{P_1} \bigg)$ ... $\Delta s = C_V \text{ln} \bigg( \frac{T_2}{T_1} \bigg) + R\text{ln} \bigg( \frac{V_1}{V_2} \bigg)$
asked
Feb 17, 2018
in
Thermodynamics
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
GATE2018211
Select the correct statement for $50%$ reaction stage in a steam turbine. The rotor blade is symmetric The stator blade is symmetric The absolute inlet flow angle is equal to absolute exit flow angle The absolute exit flow angle is equal to inlet angle of rotor blade
asked
Feb 17, 2018
in
Applications
by
Arjun
(
21.5k
points)
gate20182
0
votes
0
answers
GATE2018147
A plan slab of thickness $L$ and thermal conductivity $k$ is heated heated with a fluid on one side $(P)$, and the other side (Q) is maintained at a constant temperature, $T_Q$ of $25^oC$, as shown in the figure, the fluid is at $45^oC$ and the ... 2K$. The steady state temperature, $T_P$ (in $^oC) of the side which is exposed to the fluid is _____ (correct to two decimal places)
asked
Feb 17, 2018
in
Heat Transfer
by
Arjun
(
21.5k
points)
gate20181
0
votes
0
answers
GATE2018145
Steam flows through a nozzle at a mess flow rate of $m=0.1 \: kg/s$ with a heat loss of $5 \: kW$. THe enthalpies at inlet and exit are $2500 \: kJ/kg$ and $2350 \: kJ/kg$, respectively. Assuming negligible velocity in inlet ($C_1 \approx 0$), the velocity ($C_2$) of steam (in $m/s$) at the nozzle exit is _____ (correct to two decimal places).
asked
Feb 17, 2018
in
Applications
by
Arjun
(
21.5k
points)
gate20181
0
votes
0
answers
GATE2018146
An engine working on air standard Otto cycle is supplied with air at $0.1 MPa$ and $35^o \: C$. The compression ratio is 8. The heat supplied is $500 \: kJ/kg \: K$. The maximum temperature (in $K$) of the cycle is _______ (correct to one decimal place)
asked
Feb 17, 2018
in
Applications
by
Arjun
(
21.5k
points)
gate20181
0
votes
0
answers
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)
asked
Feb 17, 2018
in
Fluid Mechanics
by
Arjun
(
21.5k
points)
gate20181
0
votes
0
answers
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
(
21.5k
points)
gate20181
0
votes
0
answers
GATE2018144
A tank of volume $0.05 \: m^3$ contains a mixture of saturated water amd saturated steam at $200 ^oC$. The mass of the liquid present is $8 \: kg$. The entropy (in $in kJ/kg \: K$ ...
asked
Feb 17, 2018
in
Thermodynamics
by
Arjun
(
21.5k
points)
gate20181
0
votes
0
answers
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
asked
Feb 17, 2018
in
Fluid Mechanics
by
Arjun
(
21.5k
points)
gate20181
0
votes
0
answers
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
by
Arjun
(
21.5k
points)
gate20181
0
votes
0
answers
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
by
Arjun
(
21.5k
points)
gate20181
0
votes
0
answers
GATE2018110
Which one of the following statements is correct for a superheated vapour? Its pressure is less than the saturation pressure at a given temperature Its temperature is less than the saturation temperature at a given pressure Its volume is less than the ... the saturated vapour at a given temperature Its enthalpy is less than the enthalpy of the saturated vapour at a given pressure
asked
Feb 17, 2018
in
Heat Transfer
by
Arjun
(
21.5k
points)
gate20181
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