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Heat is loss from a 100 mm diameter steam pipe placed horizontally in ambient air at 30 degree Celsius. If the Nusselt number is 25 W/m² K and thermal conductivity of the air is 0.03 W/m K, then heat transfer coefficient will be
A .  7.5 W/m² K
B .  16.5 W/m² K
C .  25 W/m² K
D .  30 W/m² K
Answer: Option A
Answer: (a).7.5 W/m² K

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