A. Heat treatment of castings
B. Heating of insulators
C. Melting aluminium
D. None of the above
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. transmits all incident radiations
B. absorbs all incident radiations
C. reflects all incident radiations
D. absorbs, reflects and transmits all incident radiations
A. it is filled below core level
B. it is filled above core level
C. it is fully empty
D. none of the above
A. Thermostat
B. Thermocouple
C. Auto-transformer
D. Heating elements of variable resis-tance material
A. Quicker operation
B. Higher efficiency
C. Absence of flue gases
D. All of the above
A. Asbestos paper
B. Diatomaceous earth
C. 80 percent magnesia
D. Cork