Radiation · Heat Transfer · GATE PI

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Marks 1

GATE PI 2012
For an opaque surface, the absorptivity $$\left( \alpha \right),$$ transmissivity $$\left( \tau \right)$$ and reflectivity $$\left( \rho \right)$$ ...

Marks 2

GATE PI 2012
Consider two infinitely long thin concentric tubes of circular cross section as shown in the figure. If $${D_1}$$ and $${D_2}$$ are the diameters of t...
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