Heat Transfer Which of the following has the lowest Prandtl number? Dilute H₂SO₄ Molten sodium (a coolant used in fast breeder reactor) Transformer oil Water Dilute H₂SO₄ Molten sodium (a coolant used in fast breeder reactor) Transformer oil Water ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time t = 356 s t = 283 s t = 800 s t = 400 s t = 356 s t = 283 s t = 800 s t = 400 s ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is 120.36 4.36 2.36 Dependent on NRe only 120.36 4.36 2.36 Dependent on NRe only ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used In low range of temperature differences In high range of temperature differences To prevent corrosion of the tube bundles Because of its low cost In low range of temperature differences In high range of temperature differences To prevent corrosion of the tube bundles Because of its low cost ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The value of Stefan-Boltazman constant in SI unit is 5.6697 x 10-8kcal/m² . °K4 0.1714 x 10-8W/m².°K4 5.6697 x 10-8W/m².°K4 0.1714 x 10-8kcal/m². °K4 5.6697 x 10-8kcal/m² . °K4 0.1714 x 10-8W/m².°K4 5.6697 x 10-8W/m².°K4 0.1714 x 10-8kcal/m². °K4 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 Giving the surface a mirror finish Painting the surface black Painting the surface white (with aluminium paint) Roughening the surface Giving the surface a mirror finish Painting the surface black Painting the surface white (with aluminium paint) Roughening the surface ANSWER DOWNLOAD EXAMIANS APP
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