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Question
The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by
Options:
A .  painting the surface black.
B .  painting the surface white (with aluminium paint).
C .  giving the surface a mirror finish.
D .  roughening the surface.
Answer: Option B
Answer: (b).painting the surface white (with aluminium paint).

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