1
GATE ME 2015 Set 3
MCQ (Single Correct Answer)
+2
-0.6
A solid sphere $$1$$ of radius $$'r'$$ is placed inside a hollow, closed hemispherical surface $$2$$ of radius $$'4r'.$$ The shape factor $${F_{2 - 1}}$$ is ... GATE ME 2015 Set 3 Heat Transfer - Radiation Question 2 English
A
$$1/12$$
B
$$1/2$$
C
$$2$$
D
$$12$$
2
GATE ME 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
The total emissive power of a surface is $$500$$ $$W/{m^2}$$ at a temperature $${T_1}$$ and $$1200$$ $$W/{m^2}$$ at a temperature $${T_2}$$, where the temperatures are in Kelvin. Assuming the emissivity of the surface to be constant, the ratio of the temperatures $${{{T_1}} \over {{T_2}}}$$ is
A
$$0.308$$
B
$$0.416$$
C
$$0.803$$
D
$$0.874$$
3
GATE ME 2014 Set 2
Numerical
+2
-0
A hemispherical furnace of $$1$$ $$m$$ radius has the inner surface (emissivity, $$\varepsilon = 1$$) of its roof maintained at $$800K,$$ while its floor $$\left( {\varepsilon = 0.5} \right)$$ is kept at $$600K$$. Stefan-Boltzmannn constant is $$\,5.668 \times {10^{ - 8}}$$ $$W/{m^2}.{K^4}.$$ The net radiative heat transfer (in $$kW$$) from the roof to the floor is __________.
Your input ____
4
GATE ME 2014 Set 4
MCQ (Single Correct Answer)
+2
-0.6
Two infinite parallel plates are placed at a certain distance apart. An infinite radiation shield is inserted between the plates without touching any of them to reduce heat exchange between the plates. Assume that the emissivities of plates and radiation shield are equal. The ratio of the net heat exchange between the plates with and without the shield is
A
$$1/2$$
B
$$1/3$$
C
$$1/4$$
D
$$1/8$$
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