Heat Transfer Radiator of an automobile engine is a __________ type of heat exchanger. Direct contact Cross-current Counter-current Co-current Direct contact Cross-current Counter-current Co-current ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The absorptivity of a body is equal to its emissivity at a particular temperature under thermal equilibrium none of the listed here for circular bodies at a particular temperature under thermal equilibrium none of the listed here for circular bodies ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by Painting the surface black Roughening the surface Painting the surface white (with aluminium paint) Giving the surface a mirror finish Painting the surface black Roughening the surface Painting the surface white (with aluminium paint) Giving the surface a mirror finish ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a shell and tube heat exchanger, square pitch compared to triangular pitch None of these Gives a higher shell side pressure drop Can pack more surface area into a shell of given diameter Gives a lower shell side pressure drop None of these Gives a higher shell side pressure drop Can pack more surface area into a shell of given diameter Gives a lower shell side pressure drop ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer When warm and cold liquids are mixed, the heat transfer is mainly by conduction convection radiation none of the listed here conduction convection radiation none of the listed here ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for Cube Sphere Cylinder Equal for all the three Cube Sphere Cylinder Equal for all the three ANSWER DOWNLOAD EXAMIANS APP
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