Heat Transfer For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of 37 1.74 6.1 1 37 1.74 6.1 1 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 0.55 0.15 55.5 555 0.55 0.15 55.5 555 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer An insulator should have Low thermal conductivity High thermal conductivity A porous structure Less resistance to heat flow Low thermal conductivity High thermal conductivity A porous structure Less resistance to heat flow ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides Lower economy Higher economy Lower capacity Both A & B Lower economy Higher economy Lower capacity Both A & B ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The thermal boundary layer at NPr > 1 Disappears Is thicker than hydrodynamic boundary layer And the hydrodynamic boundary layer are identical Is thinner than hydrodynamic boundary layer Disappears Is thicker than hydrodynamic boundary layer And the hydrodynamic boundary layer are identical Is thinner than hydrodynamic boundary layer ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For evaporation of viscous solution in a multiple effect evaporator, the prefered feeding scheme is Forward None of these Backward Parallel Forward None of these Backward Parallel ANSWER DOWNLOAD EXAMIANS APP
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