Heat Transfer Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the Temperature gradient produced due to density difference Buoyancy of the bubbles produced at active nucleation site None of these Existence of thermal boundary layer Temperature gradient produced due to density difference Buoyancy of the bubbles produced at active nucleation site None of these Existence of thermal boundary layer ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For a perfectly transparent surface (like gases), the Absorptivity = 0 All of these Reflectivity = 0 Transmissivity = 1 Absorptivity = 0 All of these Reflectivity = 0 Transmissivity = 1 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second. 3 x l05 3 x l08 3 x l010 3 x l012 3 x l05 3 x l08 3 x l010 3 x l012 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Double pipe heat exchangers are preferably useful, when Overall heat transfer co-efficient is very high High viscosity liquid is to be cooled Requirement of heat transfer area is low A corrosive liquid is to be heated Overall heat transfer co-efficient is very high High viscosity liquid is to be cooled Requirement of heat transfer area is low A corrosive liquid is to be heated ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature) (ΔT)² √(ΔT) (ΔT)³ (ΔT)⁴ (ΔT)² √(ΔT) (ΔT)³ (ΔT)⁴ ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following has the highest thermal conductivity ? Air Black Water Silver Air Black Water Silver ANSWER DOWNLOAD EXAMIANS APP
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