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Recent questions and answers in Fluid Mechanics and Thermal Sciences
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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 $^oC) of the side which is exposed to the fluid is _____ (correct to two decimal places)
answered
Apr 26
in
Heat Transfer
by
GG
(
180
points)
gate2018me1
0
votes
1
answer
GATE2018223
An engine operates on the reversible cycle as shown in the figure. The work output from the engine (in ($kJ/cycle$) is ____ (correct to two decimal places).
answered
Apr 26
in
Applications
by
GG
(
180
points)
gate2018me2
0
votes
0
answers
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
in
Fluid Mechanics
by
Arjun
(
21.2k
points)
gate2019me2
0
votes
0
answers
GATE2019 ME2: 11
Onedimensional steady state heat conduction takes places through a solid whose crosssectional area varies linearly in the direction of heat transfer. Assume there is no heat generation in the solid and the thermal conductivity of the material is constant and independent of temperature. The temperature distribution in the solid is Linear Quadratic Logarithmic Exponential
asked
Feb 9
in
Heat Transfer
by
Arjun
(
21.2k
points)
gate2019me2
0
votes
0
answers
GATE2019 ME2: 12
For a simple compressible system, $v, s, p$ and $T$ are specific volume, specific entropy, pressure and temperature, respectively. As per Maxwell's relations, $\big( \frac{\partial v}{\partial s} \big) _p$ $\big( \frac{\partial s}{\partial T} \big) _p$ ... $  \big( \frac{\partial T}{\partial v} \big) _p$ $\big( \frac{\partial T}{\partial p} \big) _s$
asked
Feb 9
in
Thermodynamics
by
Arjun
(
21.2k
points)
gate2019me2
0
votes
0
answers
GATE2019 ME2: 13
Which one of the following modifications of the simple ideal Rankine cycle increases the thermal efficiency and reduces the moisture content of the steam at the turbine outlet? Increasing the boiler pressure Decreasing the boiler pressure Increasing the turbine inlet temperature decreasing the condenser pressure
asked
Feb 9
in
Thermodynamics
by
Arjun
(
21.2k
points)
gate2019me2
0
votes
0
answers
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
in
Fluid Mechanics
by
m2n037
(
940
points)
isro2009
0
votes
0
answers
ISRO200910
At the eye tip of a centrifugal impeller, blade velocity is $200 \: m/s$ while the uniform axial velocity at the inlet is $150 \: m/s$. If the sonic velocity is $300 \: m/s$, then the inlet Mach number of the flow will be $0.75$ $0.66$ $0.90$ $0.83$
asked
Mar 6, 2018
in
Applications
by
m2n037
(
940
points)
isro2009
0
votes
0
answers
ISRO20099
The radiative heat transfer rate per unit area $(W/m2)$ between two plane parallel grey surfaces (emissivity $0.9$) maintained at $400 \: K$ and $300 \: K$ is (Stefan Bottzman constant $\sigma=5.67 \times 10^{6} W/m^2K^4$) $1020$ $464$ $812$ $567$
asked
Mar 6, 2018
in
Heat Transfer
by
m2n037
(
940
points)
isro2009
0
votes
0
answers
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? $0 \: Pa$ $1400 \: Pa$ $700 \: Pa$ $350 \: Pa$
asked
Mar 6, 2018
in
Fluid Mechanics
by
m2n037
(
940
points)
isro2009
0
votes
0
answers
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
(
940
points)
isro2009
0
votes
0
answers
ISRO20096
A necessary percaution in selection of pumps for parallel operations is that HQ characteristics of both should be identical Both pumps should be centrifugal type Both pumps should be identical' There should not be change from positive to negative slope in HQ curve
asked
Mar 6, 2018
in
Applications
by
m2n037
(
940
points)
isro2009
0
votes
0
answers
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
(
940
points)
isro2009
0
votes
0
answers
ISRO20094
The relation ${p^{V}}^{\gamma}$= constant, where $\gamma$ is the ratio of the specific heats of ideal gad=s, is applicable o Any adiabatic process Only reversible adiabatic process Only irreversible adiabatic process Only isothermal process
asked
Mar 6, 2018
in
Heat Transfer
by
m2n037
(
940
points)
isro2009
0
votes
0
answers
ISRO20093
The correct sequence of the centrifugal pump components through which the fluid flows is Impeller, Suction pipe, Foot valve and strainer, Delivery pipe Foot valve and strainer, Suction pipe, Impeller, Delivery pipe Impeller, Suction pipe, Delivery pipe, Foot valve and strainer Suction pipe, Delivery pipe, Impeller, Foot valve and strainer
asked
Mar 6, 2018
in
Applications
by
m2n037
(
940
points)
isro2009
0
votes
0
answers
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
in
Fluid Mechanics
by
m2n037
(
940
points)
isro2009
0
votes
0
answers
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
points)
isro2009
0
votes
0
answers
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me2
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
(
21.2k
points)
gate2018me1
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
(
21.2k
points)
gate2018me1
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
(
21.2k
points)
gate2018me1
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
(
21.2k
points)
gate2018me1
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
(
21.2k
points)
gate2018me1
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
(
21.2k
points)
gate2018me1
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
(
21.2k
points)
gate2018me1
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
(
21.2k
points)
gate2018me1
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
(
21.2k
points)
gate2018me1
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