All of the above
The heating method has maximum power factor is Resistance heating.
Dielectric heating has leading power factor.
Dielectric heating is used for heating non-conducting materials.
Electric resistance heating
Electric resistance heating is not dependent on the frequency of supply.
Temperature of the two bodies must be different
Temperatures of the two bodies are identical
Heat transfer by condition will not occur when Temperatures of the two bodies are identical.
Absorbs all incident radiations
A perfect black body is one which Absorbs all incident radiations.
Inside boiler furnaces
Heat is transferred simultaneously by condition, convection and radiation inside boiler furnaces.
The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as Ablation.
Solid ice has the highest value of thermal conductivity.
Electro-magnetic induction principle
Induction heating process is based on Electro-magnetic induction principle.
Diatomaceous earth is suitable for low temperature applications.
A non-dimensional number generally associated with natural convection heat transfer is Grashoff number.
The temperature inside a furnace is usually measured by Optical pyrometer.
Temperature on the outer surface of furnace walls will drop
If the thickness of refractory wall of furnace is increased, then the temperature on the outer surface of furnace walls will drop.
High specific resistance
The material of the heating element for a furnace should have High specific resistance.
In a resistance furnace the atmosphere is Oxidizing.
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