Heat Transfer Which of the following is generally considered as opaque surface towards radiations? Solids Gases Both solids & liquids Liquids Solids Gases Both solids & liquids Liquids ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In Fourier's law, the proportionality constant is called the Thermal conductivity Thermal diffusivity Stefan-Boltzman constant Heat transfer co-efficient Thermal conductivity Thermal diffusivity Stefan-Boltzman constant Heat transfer co-efficient 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 0.55 0.15 555 55.5 0.55 0.15 555 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is Dependent on NRe only 1.66 88.66 3.66 Dependent on NRe only 1.66 88.66 3.66 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Analogy between mass and heat transfer is not applicable in case of Both B and C Same velocity profile or equal eddy diffusivities Thermal or pressure mass diffusion Viscous heating or chemical reaction Both B and C Same velocity profile or equal eddy diffusivities Thermal or pressure mass diffusion Viscous heating or chemical reaction ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In forced convection, the Nusselt number is a function of Re and Sc Re and Gr Re and Pr Pr and Gr Re and Sc Re and Gr Re and Pr Pr and Gr ANSWER DOWNLOAD EXAMIANS APP
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