# E-PolyLearning

 16. Dielectric heating apparatus consists of a. 4 electrodes b. Elemental strip c. No Insulating material d. 4 plates

 17. A slab of insulating material of thickness 6 cm and thermal conductivity 1.4kJ/m hr deg is placed between and is in contact with two parallel electrodes, and is then subjected to high frequency dielectric heating at a uniform rate of 140,000kJ/m³ hr. At steady state coefficients of combined radiation and convection are 42 and 48 kJ/m² hr deg. If atmospheric temperature is 25 degree Celsius, find surface temperatures? a. 144.10 degree Celsius and 134.47 degree Celsius b. 123.50 degree Celsius and 154.34 degree Celsius c. 121.60 degree Celsius and 115.45 degree Celsius d. 165.40 degree Celsius and 165.45 degree Celsius