1
GATE ME 2016 Set 2
MCQ (Single Correct Answer)
+1
-0.3
Consider the radiation heat exchange inside an annulus between two very long concentric cylinders. The radius of the outer cylinder is $${R_0}$$ and that of the inner cylinder is $${R_i}$$ . The radiation view factor of the outer cylinder onto itself is
A
$$1 - \sqrt {{{{R_i}} \over {{R_0}}}} $$
B
$$\sqrt {1 - {{{R_i}} \over {{R_0}}}} $$
C
$$1 - {\left( {{{{R_i}} \over {{R_0}}}} \right)^{1/3}}$$
D
$$1 - {{{R_i}} \over {{R_0}}}$$
2
GATE ME 2012
MCQ (Single Correct Answer)
+1
-0.3
For an opaque surface, the absorptivity $$\left( \alpha \right),$$ transmissivity $$\left( \tau \right)$$ and reflectivity $$\left( \rho \right)$$ are related by the equation:
A
$$\alpha + \rho = \tau $$
B
$$\rho + \alpha + \tau = 0$$
C
$$\alpha + \rho = 1$$
D
$$\alpha + \rho = 0$$
3
GATE ME 2005
MCQ (Single Correct Answer)
+1
-0.3
The following figure was generated from experimental data relating spectral black body emissive power to wave length at three temperatures $${T_1},{T_2}$$ and $${T_3}\left( {{T_1} > {T_2} > {T_3}} \right).$$ GATE ME 2005 Heat Transfer - Radiation Question 25 English

The conclusion is that the measurements are

A
correct because the maximum in $${E_{b\lambda }}$$ show the correct trend
B
correct because Planck's law is satisfied
C
wrong because the Stephen Boltzmannn law is not satisfied
D
wrong because Wien's displacement law is not satisfied
4
GATE ME 2003
MCQ (Single Correct Answer)
+1
-0.3
A plate having $$10\,\,c{m^2}$$ area each side is hanging in the middle of a room of $$100\,\,{m^2}$$ total surface area. The plate temperature and emissivity are respectively $$800$$ $$K$$ and $$0.6.$$

The temperature and emissivity values for the surfaces of the room are $$300$$ $$K$$ and $$0.3$$ respectively. Boltzmannn constant $$\sigma = 5.67 \times {10^{ - 8}}\,\,W/{m^2}{K^4}.$$ The total heat loss from the two surfaces of the plate is

A
$$13.66$$ $$W$$
B
$$27.32$$ $$W$$
C
$$27.87$$ $$W$$
D
$$13.66$$ $$MW$$
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