Heat Transfer Nucleate boiling is promoted None of these In the absence of agitation On polished surfaces On rough surfaces None of these In the absence of agitation On polished surfaces On rough surfaces ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Overall heat transfer co-efficient for cooling of hydrocarbons by water is about 50 -100 W/m² . °K 1000 - 1500 BTU/hr. ft.2°F 50 -100 Kcal/hr.m².°C 50 -100 BTU/hr. ft.2°F 50 -100 W/m² . °K 1000 - 1500 BTU/hr. ft.2°F 50 -100 Kcal/hr.m².°C 50 -100 BTU/hr. ft.2°F ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Film condensation is promoted on a/an __________ surface. dirty clean & smooth oily coated dirty clean & smooth oily coated ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is 55.5 555 0.15 0.55 55.5 555 0.15 0.55 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a laboratory test run, the rate of drying was found to be 0.5 x 10-3 kg/m².s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m²/kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is 2000 6000 5000 4000 2000 6000 5000 4000 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In a heat exchanger, floating head is provided to facilitate cleaning of the exchanger increase log mean temperature gradient increase the heat transfer area relieve stresses caused by thermal expansion facilitate cleaning of the exchanger increase log mean temperature gradient increase the heat transfer area relieve stresses caused by thermal expansion ANSWER DOWNLOAD EXAMIANS APP
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