1504. The energy radiated from a surface Q at absolute temperature T is related as

By Admin / September 7, 2025

Q ∝ T²

Q ∝ T⁴

Q ∝ T³

None of these

✅ The correct answer is option B.

1502. Dropwise condensation occurs on __________ surfaces.

1507. A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time

1. A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm².

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2. Transformer cores are normally made from

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