Heat Transfer The energy radiated from a surface Q at absolute temperature T is related as None of these Q ∝ T⁴ Q ∝ T² Q ∝ T³ None of these Q ∝ T⁴ Q ∝ T² Q ∝ T³ ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer 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 Painting the surface white (with aluminium paint) Giving the surface a mirror finish Painting the surface black Roughening the surface Painting the surface white (with aluminium paint) Giving the surface a mirror finish Painting the surface black Roughening the surface ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer With increase in porosity, the thermal conductivity of a solid substance Remains unchanged Decreases Increases May increase or decrease; depends on the solid Remains unchanged Decreases Increases May increase or decrease; depends on the solid ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following is correct ? Rate = Driving force x Resistance Driving force = Rate x Resistance Resistance = Driving force x Rate Rate = Resistance/Driving force Rate = Driving force x Resistance Driving force = Rate x Resistance Resistance = Driving force x Rate Rate = Resistance/Driving force ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water. Boiling point (at the same pressure) Thermal conductivity Viscosity Density Boiling point (at the same pressure) Thermal conductivity Viscosity Density ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone. Low No High Extremely low Low No High Extremely low ANSWER DOWNLOAD EXAMIANS APP
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