Heat Transfer Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is Thick walled Having the value of Ao/Ai > 2 Thin walled having the value of Ao Ai/< 2 Both B and C Thick walled Having the value of Ao/Ai > 2 Thin walled having the value of Ao Ai/< 2 Both B and C ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation. Remains constant Decreases Increases May increase or decrease ; depends on the material Remains constant Decreases Increases May increase or decrease ; depends on the material ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Rate of heat transfer by vaporisation from pools of water is affected by the Viscosity of water All of these Nature of heating surface and distribution of bubbles Surface tension of water Viscosity of water All of these Nature of heating surface and distribution of bubbles Surface tension of water ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A black body does not __________ radiation. Absorb or emit Refract Both B & C Reflect Absorb or emit Refract Both B & C Reflect ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be Equal to 45°C More than 45°C Less than 45°C Initially decreases and remains constant thereafter Equal to 45°C More than 45°C Less than 45°C Initially decreases and remains constant thereafter ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The most conducive surface for dropwise condensation to occur is the __________ surface. Oily Glazed & polished Coated Smooth Oily Glazed & polished Coated Smooth ANSWER DOWNLOAD EXAMIANS APP
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