Heat Transfer A sphere of radius 'R₁' is enclosed in a sphere of radius 'R₂'. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is (R₁/R₂)2 1 R₂/(R₁+R₂) (R₁/R₂)2 1 R₂/(R₁+R₂) 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 Roughening the surface Painting the surface black Giving the surface a mirror finish Painting the surface white (with aluminium paint) Roughening the surface Painting the surface black Giving the surface a mirror finish Painting the surface white (with aluminium paint) ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Overall heat transfer co-efficient for cooling of hydrocarbons by water is about 50 -100 BTU/hr. ft.2°F 50 -100 Kcal/hr.m².°C 1000 - 1500 BTU/hr. ft.2°F 50 -100 W/m² . °K 50 -100 BTU/hr. ft.2°F 50 -100 Kcal/hr.m².°C 1000 - 1500 BTU/hr. ft.2°F 50 -100 W/m² . °K ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer __________ paint has the minimum absorption co-efficient. White lead Light cream Black Grey White lead Light cream Black Grey ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface? Liquid density Interfacial tension Hot surface temperature Liquid viscosity Liquid density Interfacial tension Hot surface temperature Liquid viscosity ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would Decrease First increase and then decrease First decrease and then increase Increase Decrease First increase and then decrease First decrease and then increase Increase ANSWER DOWNLOAD EXAMIANS APP
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