TS EAMCET 5 May 2018 Shift 2 Solved Paper

Heat loss takes place from a body maintained at a temperature of400°C to the surrounding air at 30°C by convection and to thesurrounding surfaces at 30°C by radiation. The Newton'scooling coefficient is 20W∕m2K and the Stefan-Boltzmannconstant is 5.67×10−8W∕m2K4. If the rate of heat loss byconvection is equal to the rate of heat loss by radiation, theemissivity of the body surface is