Heat Transfer The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body) α T⁴ α 1/T Independent of T αT α T⁴ α 1/T Independent of T αT ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A BTU/hr.ft.2 °F is equal to 1 kcal/hr. m².°K 4.88 kcal/hr. m.2°C 1 kcal/hr. m²°C None of these 1 kcal/hr. m².°K 4.88 kcal/hr. m.2°C 1 kcal/hr. m²°C None of these ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that There is no internal heat generation Boundary surfaces are isothermal Constant temperature gradient exists Material is anisotropic There is no internal heat generation Boundary surfaces are isothermal Constant temperature gradient exists Material is anisotropic ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Heat flux, as defined in heat flow is analogous to __________ in electricity flow. Current Voltage None of these Resistance Current Voltage None of these Resistance ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone. laminar highly turbulent transition None of the listed here laminar highly turbulent transition None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Which of the following situations can be approximated to a steady state heat transfer system? A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmosheric air at 35°C 10 kg of dry saturated steam at 8 kgf/cm² flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmosheric air at 35°C 10 kg of dry saturated steam at 8 kgf/cm² flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C ANSWER DOWNLOAD EXAMIANS APP
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