Heat Transfer The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation. May increase or decrease ; depends on the material Decreases Increases Remains constant May increase or decrease ; depends on the material Decreases Increases Remains constant ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a backward feed multiple effect evaporator Feed is introduced in the first effect No pumps are required between successive effects None of these Feed flows from low pressure to high pressure Feed is introduced in the first effect No pumps are required between successive effects None of these Feed flows from low pressure to high pressure ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The non-dimensional temperature gradient in a liquid at the wall of a pipe is the Prandtl number Nusselt number Heat flux Schmidt number Prandtl number Nusselt number Heat flux Schmidt number ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Natural convection is characterised by Peclet number Grashhoff number Prandtl number Reynolds number Peclet number Grashhoff number Prandtl number Reynolds number 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 55.5 0.15 555 0.55 55.5 0.15 555 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Dietus-Boelter equation cannot be used for molten metals mainly due to its very low viscosity thermal conductivity Grashoff number Prandtl number viscosity thermal conductivity Grashoff number Prandtl number ANSWER DOWNLOAD EXAMIANS APP
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