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Recent questions tagged heat-transfer
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GATE2020-ME-2: 50
The spectral distribution of radiation from a black body at $T_1=3000 \: K$ has a maximum at wavelength $\lambda_{\text{max}}$. The body cools down to a temperature $T_2$ ... the original wavelength $\lambda_{\text{max}}$, then the temperature $T_2$ is _________ $K$ (round off to nearest integer)
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in
Heat Transfer
Sep 18, 2020
by
go_editor
5.0k
points
gateme-2020-set2
numerical-answers
black-and-grey-surfaces
heat-transfer
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2020-ME-1: 11
Match the following ... $P-3,\:Q-3,\:R-1\:,S-3$ $P-4,\:Q-3,\:R-2\:,S-1$
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asked
in
Heat Transfer
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2020-ME-1: 25
In a concentric tube counter-flow heat exchanger, hot oil enters at $102^{\circ}C$ and leaves at $65^{\circ}C$. Cold water enters at $25^{\circ}C$ and leaves at $42^{\circ}C$. The log mean temperature difference $(LMTD)$ is ________ $^{\circ}C$ (round off to one decimal place).
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asked
in
Heat Transfer
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2020-ME-1: 34
A small metal bead $(\text{radius}\: 0.5\: mm)$, initially at $100^{\circ}C$ , when placed in a stream of fluid at $20^{\circ}C$ , attains a temperature of $28^{\circ}C$ in $4.35$ ... heat transfer coefficient $(in\:W/m^{2}.K)$ between the metal bead and the fluid stream is $283.3$ $299.8$ $149.9$ $449.7$
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asked
in
Heat Transfer
Feb 19, 2020
by
go_editor
5.0k
points
gateme-2020-set1
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2019 ME-2: 10
Sphere $1$ with a diameter of $0.1$ m is completely enclosed by another sphere $2$ of diameter $0.4$m. The view factor $F_{12}$ is $0.0625$ $0.25$ $0.5$ $1.0$
Arjun
asked
in
Heat Transfer
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
view-factors
heat-transfer
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2019 ME-2: 11
One-dimensional steady state heat conduction takes places through a solid whose cross-sectional 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
Arjun
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in
Heat Transfer
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
heat-transfer
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2019 ME-2: 24
A thin vertical flat plate of height $L$, and infinite width perpendicular to the plane of the figure, is losing heat to the surroundings by natural convection. The temperatures of the plate and the surroundings by natural convection. The temperatures of the plate and the ... plate is $h_1$ and that for the second plate is $h_2$, the value of the ratio $h_1/h_2$ is ____________
Arjun
asked
in
Heat Transfer
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2019 ME-2: 46
Hot and cold fluids enter a parallel flow double tube heat exchanger at $100^{\circ}C$ and $15^{\circ} C$, respectively. The heat capacity rates of hot and cold fluids are $C_h=2000 \: W/K$ and $C_c =1200 \: W/K$, respectively. If the outlet ... $45^{\circ} C$, the log mean temperature difference (LMTD) of the heat exchanger is __________ $K$ (round off to two decimal places).
Arjun
asked
in
Heat Transfer
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2019 ME-1: 11
A slender rod of length $L$, diameter $d$ $(L > >d)$ and thermal conductivity $k_1$ is joined with another rod of identical dimensions, but of thermal conductivity $k_2$, to form a composite cylindrical rod of length $2L$. The heat transfer in radial direction and ... composite rod is $k_1+k_2 \\$ $\sqrt{k_1k_2} \\$ $\dfrac{k_1k_2}{k_1+k_2} \\$ $\dfrac{2k_1k_2}{k_1+k_2}$
Arjun
asked
in
Heat Transfer
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2019 ME-1: 21
A solid cube of side $1$ m is kept at a room temperature of $32^{\circ} C$. The coefficient of linear thermal expansion of the cube material is $1 \times 10^{-5} / ^{\circ}C$ and the bulk modulus is $200$ GPa. If the cube is constrained all around and heated uniformly to $42^{\circ}C$, then the magnitude of volumetric (mean) stress (in MPa) included due to heating is _______
Arjun
asked
in
Heat Transfer
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2019 ME-1: 47
Three slabs are joined together as shown in the figure. There is no thermal contact resistance at the interfaces. The center slab experiences a non-uniform internal heat generation with an average value equal to $10000 \: Wm^{-3}$, while the left and right slabs have no ... $T_1$ is measured to be $100^{\circ} C$, the right extreme face temperature $T_2$ is ______$^{\circ} C$.
Arjun
asked
in
Heat Transfer
Feb 9, 2019
by
Arjun
27.4k
points
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
1
vote
GATE ME 2012 | Question: 53
Air enters an adiabatic nozzle at $300$ kPa, $500$ K with a velocity of $10$ m/s. It leaves the nozzle at $100$ kPa with a velocity of $180$ m/s. The inlet area is $80 \: cm^2$. The specific heat of air $C_p$ is $1008$ J/kg.K. The exit area of the nozzle in $cm^4$ is $90.1$ $56.3$ $4.4$ $12.9$
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Heat Transfer
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE ME 2012 | Question: 52
Air enters an adiabatic nozzle at $300$ kPa, $500$ K with a velocity of $10$ m/s. It leaves the nozzle at $100$ kPa with a velocity of $180$ m/s. The inlet area is $80 cm^2$. The specific heat of air $C_p$ is $1008$ J/kg.K. The exit temperature of the air is $516$ K $532$ K $484$ K $468$ K
Andrijana3306
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Heat Transfer
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE ME 2012 | Question: 42
A solid steel cube constrained on all six faces is heated so that the temperature rises uniformly by $\Delta T$. If the thermal coefficient of the material is $\alpha$, Young's modulus is $E$ and the Poisson's ratio is $\upsilon$, the thermal stress developed in the cube due to ... $-\dfrac{\alpha (\Delta T) E}{3 (1-2 \upsilon)}$
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Heat Transfer
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE ME 2012 | Question: 41
Water $(C_p=4.18 \: kJ/kg.K)$ at $80^{\circ} C$ enters a counterflow heat exchanger with a mass flow rate of $0.5 \: kg/s$. Air ($C_p=1 \: kJ/kg.K$) enters at $30^{\circ} C$ with a mass flow rate of $2.09 \: kg/s$. If the effectiveness of heat exchanger is $0.8$, the LMTD (in $^{\circ} C$) is $40$ $20$ $10$ $5$
Andrijana3306
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in
Heat Transfer
Mar 20, 2018
by
Andrijana3306
1.5k
points
gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
lmtd-and-ntu-methods
0
answers
0
votes
GATE ME 2012 | Question: 18
Which one of the following configurations has the highest fin effectiveness? Thin, closely spaced fins Thin, widely spaced fins Thick, widely spaced fins Thick, closely spaced fins
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Heat Transfer
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
fin
0
answers
0
votes
GATE ME 2012 | Question: 4
During $\textit{normalizing} $ process of steel, the specimen is heated between the upper and lower critical temperature and cooled in still air above the upper critical temperature and cooled in furnace above the upper critical temperature and cooled in still air between the upper and lower critical temperature and cooled in furnace
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Heat Transfer
Mar 20, 2018
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Andrijana3306
1.5k
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gateme-2012
fluid-mechanics-and-thermal-science
heat-transfer
1
answer
0
votes
GATE2018-1-47
A plane 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 $25^{\circ}C$ ... The steady state temperature, $T_P$ (in $^{\circ}$C) of the side which is exposed to the fluid is _____ (correct to two decimal places)
Arjun
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in
Heat Transfer
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set1
numerical-answers
heat-transfer
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2018-1-10
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
Arjun
asked
in
Heat Transfer
Feb 17, 2018
by
Arjun
27.4k
points
gateme-2018-set1
heat-transfer
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2017 ME-2: 47
A metal ball of diameter $60$ mm is initially at $220^{\circ}$ C. The ball is suddenly cooled by an air jet of $20^{\circ}$ C. The heat transfer coefficient is $200 W/m^{2}.K$ ... $^{\circ} C$) after $90$ seconds will be approximately $141$ $163$ $189$ $210$
Arjun
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in
Heat Transfer
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2017 ME-2: 46
In a counter-flow heat exchanger, water is heated at the rate of $1.5 \: kg/s$ from $40^{\circ}$ C to $80^{\circ} \: C$ by an oil entering at $120^{\circ}$ C and leaving at $60 ^{\circ}$ C. The specific heats of water and oil are $4.2 \: kJ/kg.K$ and ... transfer coefficient is $400 W/m^{2}.K$. The required heat transfer surface area (in $m^{2}$) is $0.104$ $0.022$ $10.4$ $21.84$
Arjun
asked
in
Heat Transfer
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2017 ME-2: 19
The emissive power of a blackbody is $P$. If its absolute temperature is doubled, the emissive power becomes $2 P$ $4 P$ $8 P$ $16 P$
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Heat Transfer
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
numerical-answers
black-and-grey-surfaces
heat-transfer
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2017 ME-2: 18
The heat loss from a fin is $6$ W. The effectiveness and efficiency of the fin are $3$ and $0.75$, respectively. The heat loss (in W) from the fin, keeping the entire fin surface at base temperature, is _______.
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in
Heat Transfer
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2017 ME-2: 10
A steel bar is held by two fixed supports as shown in the figure and is subjected to an increase of temperature $\Delta T=100^{\circ}C$. If the coefficient of thermal expansion and Young's modulus of elasticity of steel are $11 \times 10^{-6}/^{\circ} C$ and $200$ GPa, respectively, the magnitude of thermal stress (in MPa) induced in the bar is _______
Arjun
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in
Heat Transfer
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2017 ME-1: 38
Heat is generated uniformly in a long solid cylindrical rod (diameter$=10$ mm) at the rate of $4 \times 10^{7} W/m^{3}$. The thermal conductivity of the rod material is $25 W/m.K$. Under steady state conditions, the temperature difference between the centre and the surface of the rod is ______ $^{\circ} C$.
Arjun
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Heat Transfer
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2017 ME-1: 37
Two black surfaces, AB and BC, of lengths $5$ m and $6$ m, respectively, are oriented as shown. Both surfaces extend infinitely into the third dimension. Given that view factor $F_{12}=0.5, T_{1}=800 K, T_{2}=600 K, T_{\text{surrounding}}=300 K$ and Stefan- ... $2$ to the surrounding environment is _______ kW.
Arjun
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Heat Transfer
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2017 ME-1: 12
A heat pump absorbs $10$kW of heat from outside environment at $250$ K while absorbing $15$ kW of work. It delivers the heat to a room that must be kept warm at $300$ K. The Coefficient of Performance (COP) of the heat pump is ________.
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in
Heat Transfer
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2017 ME-1: 11
The molar specific heat at constant volume of an ideal gas is equal to $2.5$ times the universal gas constant ($8.314$ J/mol.K). When the temperature increases by $100$K, the change in molar specific enthalpy is __________ J/mol.
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Heat Transfer
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2017 ME-1: 10
Saturated steam at $100^{\circ} C$ condenses on the outside of a tube. Cold fluid enters the tube at $20^{\circ} C$ and exits at $50^{\circ} C$. The value of the Log mean Temperature Difference (LMTD) is ________ $^{\circ}$ C.
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Heat Transfer
Feb 27, 2017
by
Arjun
27.4k
points
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
1
answer
0
votes
GATE2016-3-52
Two optically flat plates of glass are kept at a small angle $\theta$ as shown in the figure. Monochromatic light is incident vertically. If the wavelength of light used to get a fringe spacing of $1$ $mm$ is $450$ $nm$, the wavelength of light (in $nm$) to get a fringe spacing of $1.5$ $mm$ is _________
Arjun
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in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
heat-transfer
fluid-mechanics-and-thermal-science
0
answers
0
votes
GATE2016-3-43
A cylindrical steel rod, $0.01 \: m$ in diameter and $0.2 \: m$ in length is first heated to $750^ \circ C$ and then immersed in a water bath at $100^ \circ C$. The heat transfer coefficient is $250 \: W/m^2-K$. The density, specific heat and thermal ... $k=43 \: W/m-K$, respectively. The time required for the rod to reach $300^ \circ C$ is ________ seconds.
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Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2016-3-42
Two large parallel plates having a gap of $10 \: mm$ in between them are maintained at temperatures $T_1 = 1000 \: K$ and $T_2 = 400 \: K$. Given emissivity values, $\epsilon _1 = 0.5$, $\epsilon _2=0.25$ and Stefan-Boltzmann constant $\sigma =5.67 \times 10^{−8} \: W/m^2-K^4$, the heat transfer between the plates (in $kW/m^2$) is __________
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Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-transfer-correlations-for-flow-over-flat-plates-and-through-pipes
0
answers
0
votes
GATE2016-3-18
For a heat exchanger, $\triangle T_{\text{max}}$ is the maximum temperature difference and $\triangle T_{\text{min}}$ is the minimum temperature difference between the two fluids. LMTD is the log mean temperature difference. $C_{\text{min}}$ and $C_{\text{max}}$ are the minimum ... $C_{\text{max}} \triangle T_{\text{max}}$ $C_{\text{max}} \triangle T_{\text{min}}$
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Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set3
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2016-3-17
The INCORRECT statement about the characteristics of critical point of a pure substance is that there is no constant temperature vaporization process it has point of inflection with zero slope the ice directly converts from solid phase to vapor phase saturated liquid and saturated vapor states are identical
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Heat Transfer
Feb 24, 2017
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Arjun
27.4k
points
gateme-2016-set3
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-3-15
Steady one-dimensional heat conduction takes place across the faces $1$ and $3$ of a composite slab consisting of slabs $A$ and $B$ in perfect contact as shown in the figure, where $k_A$ , $k_B$ denote the respective thermal conductivities. Using the data as given in the figure, the interface temperature $T_2$ (in $^\circ C$) is __________
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Heat Transfer
Feb 24, 2017
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Arjun
27.4k
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gateme-2016-set3
numerical-answers
one-dimensional-heat-conduction
heat-transfer
applied-mechanics-and-design
0
answers
0
votes
GATE2016-2-45
A reversible cycle receives $40 \: kJ$ of heat from one heat source at a temperature of $127^ \circ C$ and $37 \: kJ$ from another heat source at $97^ \circ C$. The heat rejected (in $kJ$) to the heat sink at $47^ \circ C$ is __________
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Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-2-43
Two cylindrical shafts $A$ and $B$ at the same initial temperature are simultaneously placed in a furnace. The surfaces of the shafts remain at the furnace gas temperature at all times after they are introduced into the furnace. The temperature variation in the axial ... required (in hours) for the centerline of the shaft B to attain the temperature of $400^ \circ C$ is _______ .
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Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-2-42
Consider a parallel-flow heat exchanger with area $A_p$ and a counter-flow heat exchanger with area $A_c$ . In both the heat exchangers, the hot stream flowing at $1 \: kg/s$ cools from $80^\circ C$ to $50^\circ C$. For the cold stream ... exchangers are of the same fluid. Also, both the heat exchangers have the same overall heat transfer coefficient. The ratio $A_c/A_p$ is _________
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Heat Transfer
Feb 24, 2017
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Arjun
27.4k
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gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
0
answers
0
votes
GATE2016-2-35
A circular metallic rod of length $250 \: mm$ is placed between two rigid immovable walls as shown in the figure. The rod is in perfect contact with the wall on the left side and there is a gap of $0.2 \: mm$ between the rod and the wall on the right side. If the ... material of the rod is $200 \: GPa$ and the coefficient of thermal expansion is $10^{−5}$ per $_{}^{\circ}\textrm{C}$.
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in
Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
points
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
0
answers
0
votes
GATE2016-2-16
Consider the radiation heat exchange inside an annulus between two very long concentric cylinders. The radius of the outer cylinder is $R_o$ and that of the inner cylinder is $R_i$ . The radiation view factor of the outer cylinder onto itself is $1-\sqrt{\dfrac{R_i}{R_o}}\\$ $\sqrt{1-\dfrac{R_i}{R_o}} \\$ $1-\dfrac{R_i}{R_o}^{1/3} \\$ $1-\dfrac{R_i}{R_o}$
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Heat Transfer
Feb 24, 2017
by
Arjun
27.4k
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gateme-2016-set2
fluid-mechanics-and-thermal-science
heat-transfer
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