GATE2017 ME-2: 18

Arjun asked in Heat Transfer Feb 27, 2017 recategorized Mar 5, 2021 by Lakshman Patel RJIT

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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 _______.

gateme-2017-set2
numerical-answers
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heat-transfer

Arjun asked in Heat Transfer Feb 27, 2017 recategorized Mar 5, 2021 by Lakshman Patel RJIT

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Arjun asked in Heat Transfer Feb 27, 2017

GATE2017 ME-2: 19
The emissive power of a blackbody is $P$. If its absolute temperature is doubled, the emissive power becomes $2 P$ $4 P$ $8 P$ $16 P$

Arjun asked in Heat Transfer Feb 27, 2017

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Arjun asked in Heat Transfer Feb 27, 2017

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 asked in Heat Transfer Feb 27, 2017

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Arjun asked in Heat Transfer Feb 27, 2017

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 asked in Heat Transfer Feb 27, 2017

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Arjun asked in Heat Transfer Feb 27, 2017

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

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gateme-2017-set2
fluid-mechanics-and-thermal-science
heat-transfer
heat-exchanger

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Arjun asked in Heat Transfer Feb 27, 2017

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 asked in Heat Transfer Feb 27, 2017

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GATE2017 ME-2: 18

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