Heat Transfer In sub-cooled boiling, Very large vapour space is necessary Bubbles from heating surface are absorbed by the mass of the liquid Temperature of the heating surface is more than the boiling point of the liquid Temperature of the heating surface is less than the boiling point of the liquid Very large vapour space is necessary Bubbles from heating surface are absorbed by the mass of the liquid Temperature of the heating surface is more than the boiling point of the liquid Temperature of the heating surface is less than the boiling point of the liquid ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the None of these Buoyancy of the bubbles produced at active nucleation site Temperature gradient produced due to density difference Existence of thermal boundary layer None of these Buoyancy of the bubbles produced at active nucleation site Temperature gradient produced due to density difference Existence of thermal boundary layer ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is 55.5 0.15 555 0.55 55.5 0.15 555 0.55 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is 0.0035 3.5 0.025 5.6 0.0035 3.5 0.025 5.6 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following has the minimum absorptivity? Coal dust Refractory bricks Iron plates Aluminium foil Coal dust Refractory bricks Iron plates Aluminium foil ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is Less Same More or less; depends on the nature of solution More Less Same More or less; depends on the nature of solution More ANSWER DOWNLOAD EXAMIANS APP
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