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ISRO2009-9
The radiative heat transfer rate per unit area $(W/m2)$ between two plane parallel grey surfaces (emissivity $0.9$) maintained at $400 \: \text{K}$ and $300 \: \text{K}$ is (Stefan Bottzman constant $\sigma=5.67 \times 10^{-6} \;W/m^2K^4)$ $1020$ $464$ $812$ $567$
The radiative heat transfer rate per unit area $(W/m2)$ between two plane parallel grey surfaces (emissivity $0.9$) maintained at $400 \: \text{K}$ and $300 \: \text{K}$ ...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
edited
Jun 26, 2022
Heat Transfer
isro2009
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ISRO2009-4
The relation ${p^{V}}^{\gamma}=$ constant, where $\gamma$ is the ratio of the specific heats of ideal gas, is applicable to Any adiabatic process Only reversible adiabatic process Only irreversible adiabatic process Only isothermal process
The relation ${p^{V}}^{\gamma}=$ constant, where $\gamma$ is the ratio of the specific heats of ideal gas, is applicable toAny adiabatic processOnly reversible adiabatic ...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
edited
Jun 26, 2022
Heat Transfer
isro2009
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GATE2020-ME-1: 11
Match the following ... $P-3,\:Q-3,\:R-1\:,S-3$ $P-4,\:Q-3,\:R-2\:,S-1$
Match the following $$\begin{array}{|cl|cl|}\hline&\text{Heat treatment process} && \text{Effect}\\ \hlineP:& \text{Tempering} & 1.&\text{Strengthening} \\ \hlineQ:& ...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
recategorized
Mar 6, 2021
Heat Transfer
gateme-2020-set1
fluid-mechanics-and-thermal-science
heat-transfer
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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).
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^{\cir...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
recategorized
Mar 6, 2021
Heat Transfer
gateme-2020-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
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0
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0
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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$
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$ ...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
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Mar 6, 2021
Heat Transfer
gateme-2020-set1
fluid-mechanics-and-thermal-science
heat-transfer
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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$
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$
Lakshman Bhaiya
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Lakshman Bhaiya
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Heat Transfer
gateme-2019-set2
view-factors
heat-transfer
fluid-mechanics-and-thermal-science
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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 ____________
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 tempe...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
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Heat Transfer
gateme-2019-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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0
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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).
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 ar...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
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Heat Transfer
gateme-2019-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
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0
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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 $k_1+k_2 \\$ $\sqrt{k_1k_2} \\$ $\dfrac{k_1k_2}{k_1+k_2} \\$ $\dfrac{2k_1k_2}{k_1+k_2}$
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 $k_2$, ...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2019-set1
fluid-mechanics-and-thermal-science
heat-transfer
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0
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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 _______
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} / ^{\cir...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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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 ______$^{\circ} C$.
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 ...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
recategorized
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Heat Transfer
gateme-2019-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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1
answers
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)
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 temperatu...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
recategorized
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Heat Transfer
gateme-2018-set1
numerical-answers
heat-transfer
fluid-mechanics-and-thermal-science
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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
Which one of the following statements is correct for a superheated vapour?Its pressure is less than the saturation pressure at a given temperatureIts temperature is less ...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
recategorized
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Heat Transfer
gateme-2018-set1
heat-transfer
fluid-mechanics-and-thermal-science
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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 ______ $^{\circ} C$.
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 $...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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0
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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.
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 ...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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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 ________.
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. ...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
recategorized
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Heat Transfer
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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0
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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.
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,...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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0
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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.
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...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2017-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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0
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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 $141$ $163$ $189$ $210$
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^{...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2017-set2
fluid-mechanics-and-thermal-science
heat-transfer
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0
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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 $0.104$ $0.022$ $10.4$ $21.84$
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 ...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2017-set2
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
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0
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0
votes
GATE2017 ME-2: 19
The emissive power of a blackbody is $P$. If its absolute temperature is doubled, the emissive power becomes $2 P$ $4 P$ $8 P$ $16 P$
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$
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2017-set2
numerical-answers
black-and-grey-surfaces
heat-transfer
fluid-mechanics-and-thermal-science
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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 _______.
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...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2017-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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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 _______
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 exp...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2017-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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1
answers
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 _________
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 t...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2016-set3
numerical-answers
heat-transfer
fluid-mechanics-and-thermal-science
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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.
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 ...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
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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 __________
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, $\ep...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
recategorized
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Heat Transfer
gateme-2016-set3
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-transfer-correlations-for-flow-over-flat-plates-and-through-pipes
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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 ... $C_{\text{max}} \triangle T_{\text{max}}$ $C_{\text{max}} \triangle T_{\text{min}}$
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 tw...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2016-set3
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
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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
The INCORRECT statement about the characteristics of critical point of a pure substance is thatthere is no constant temperature vaporization processit has point of inflec...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
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Heat Transfer
gateme-2016-set3
fluid-mechanics-and-thermal-science
heat-transfer
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–
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 __________
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 fig...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
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Mar 5, 2021
Heat Transfer
gateme-2016-set3
numerical-answers
one-dimensional-heat-conduction
heat-transfer
applied-mechanics-and-design
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–
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 __________
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 ...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
recategorized
Mar 5, 2021
Heat Transfer
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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–
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 _______ .
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 temperatur...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
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Heat Transfer
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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–
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 _________
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 \: k...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
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Mar 5, 2021
Heat Transfer
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
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–
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 $_{}^{\circ}\textrm{C}$.
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 ...
Lakshman Bhaiya
21.7k
points
Lakshman Bhaiya
recategorized
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Heat Transfer
gateme-2016-set2
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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–
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 $1-\sqrt{\dfrac{R_i}{R_o}}\\$ $\sqrt{1-\dfrac{R_i}{R_o}} \\$ $1-\dfrac{R_i}{R_o}^{1/3} \\$ $1-\dfrac{R_i}{R_o}$
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 cylinde...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
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Heat Transfer
gateme-2016-set2
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger
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0
answers
0
votes
GATE2016-1-49
Heat is removed from a molten metal of mass $2$ $kg$ at a constant rate of $10$ $kW$ till it is completely solidified.The cooling curve is shown in the figure Assuming uniform temperature throughout the volume of the metal during solidification,the latent heat of fusion of metal ( in $kJ$/$kg$) is _________
Heat is removed from a molten metal of mass $2$ $kg$ at a constant rate of $10$ $kW$ till it is completely solidified.The cooling curve is shown in the figureAssuming uni...
Lakshman Bhaiya
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Heat Transfer
gateme-2016-set1
numerical
fluid-mechanics-and-thermal-science
heat-transfer
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0
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GATE2016-1-45
For water at $25^\circ C$, $dp_s/dT_s = 0.189 \: kPa/K$ ($p_s$ is the saturation pressure in $kPa$ and $T_s$ is the saturation temperature in $K$) and the specific volume of dry saturated vapour is $43.38 \: m^3/kg$. Assume that the ... vapour. Using the Clausius-Clapeyron equation, an estimate of the enthalpy of evaporation of water at $25^\circ C$ (in $kJ / kg$) is __________
For water at $25^\circ C$, $dp_s/dT_s = 0.189 \: kPa/K$ ($p_s$ is the saturation pressure in $kPa$ and $T_s$ is the saturation temperature in $K$) and the specific volum...
Lakshman Bhaiya
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Lakshman Bhaiya
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Heat Transfer
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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GATE2016-1-43
An infinitely long furnace of $0.5\:m\times 0. 4 \:m$ cross-section is shown in the figure below. Consider all surfaces of the furnace to be black. The top and bottom walls are maintained at temperature $T_1=T_3=927^\circ C$ ... loss or gain on side $1$ is_________ $W/m$. Stefan-Boltzmann constant = $5.67 \times 10^{-8}$ $W/m^2-K^4$
An infinitely long furnace of $0.5\:m\times 0. 4 \:m$ cross-section is shown in the figure below. Consider all surfaces of the furnace to be black. The top and bottom wal...
Lakshman Bhaiya
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Lakshman Bhaiya
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Heat Transfer
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
heat-transfer-correlations-for-flow-over-flat-plates-and-through-pipes
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0
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GATE2016-1-42
A steel ball of $10\:mm$ diameter at $1000\:K$ is required to be cooled to $350\:K$ by immersing it in a water environment at $300\:K$. The convective heat transfer coefficient is $1000\:W/m^2-K$. Thermal conductivity of steel is $40\:W/m-K$. The time constant for the cooling process $\tau$ is $16\:s$. The time required (in $s$) to reach the final temperature is __________
A steel ball of $10\:mm$ diameter at $1000\:K$ is required to be cooled to $350\:K$ by immersing it in a water environment at $300\:K$. The convective heat transfer coeff...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
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Mar 5, 2021
Heat Transfer
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
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GATE2016-1-41
A steady laminar boundary layer is formed over a flat plate as shown in the figure. The free stream velocity of the fluid is $U_o$. The velocity profile at the inlet $a-b$ is uniform, while that at a downstream location $c-d$ ... rate, $\dot{m}_{bd}$ leaving through the horizontal section $b-d$ to that entering through the vertical section $a-b$ is ___________
A steady laminar boundary layer is formed over a flat plate as shown in the figure. The free stream velocity of the fluid is $U_o$. The velocity profile at the inlet $a-b...
Lakshman Bhaiya
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Lakshman Bhaiya
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Heat Transfer
gateme-2016-set1
numerical-answers
fluid-mechanics-and-thermal-science
heat-transfer
thermal-boundary-layer
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0
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GATE2015-3-54
A brick wall $\left(k=0.9\displaystyle{\frac{W}{m.k}}\right)$ of thickness $0.18$ $m$ separates the warm air in a room from the cold ambient air. On a particular winter day, the outside air temperature is $−5^\circ C$ ... resistance of the air inside the room, the heat loss, in $\displaystyle{\frac{W}{m^2}}$, is $88$ $110$ $128$ $160$
A brick wall $\left(k=0.9\displaystyle{\frac{W}{m.k}}\right)$ of thickness $0.18$ $m$ separates the warm air in a room from the cold ambient air. On a particular winter d...
Lakshman Bhaiya
21.7k
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Lakshman Bhaiya
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Mar 4, 2021
Heat Transfer
gateme-2015-set3
fluid-mechanics-and-thermal-science
heat-transfer
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