Heating and Welding

A. inside boiler furnaces
B. during melting of ice
C. through the surface of the insulted pipe carrying steam
D. from refrigerator coils to freezer of a refrigerator

A. temperature of the two bodies must be different
B. both bodies must be solids
C. both bodies must be in contact
D. at least one of the bodies must have some source of heating

A. transmits all incident radiations
B. absorbs all incident radiations
C. reflects all incident radiations
D. absorbs, reflects and transmits all incident radiations

A. white body
B. grey body
C. black body
D. transparent body

A. Eddy current heating
B. Arc heating
C. Induction heating
D. Dielectric heating

A. Copper
B. Aluminium
C. Brass
D. Steel

A. Arc heating
B. Dielectric heating
C. Induction heating
D. Resistance heating

A. Quicker operation
B. Higher efficiency
C. Absence of flue gases
D. All of the above

A. Resistance heating
B. Dielectric heating
C. Arc heating
D. Induction heating

A. Induction heating
B. Dielectric heating
C. Electric resistance heating
D. All of the above