Category: Heating and Welding

A. Asbestos paper
B. Diatomaceous earth
C. 80 percent magnesia
D. Cork

A. Heat treatment of castings
B. Heating of insulators
C. Melting aluminium
D. None of the above

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

A. Thermostat
B. Thermocouple
C. Auto-transformer
D. Heating elements of variable resis-tance material

A. induction heating of steel
B. dielectric heating
C. induction heating of brass
D. resistance heating

A. bad, good
B. bad, bad
C. good, bad
D. good, good

A. tungsten
B. graphite
C. silver
D. copper

A. Heat loss through furnace wall will increase
B. Temperature inside the furnace will fall
C. Temperature on the outer surface of furnace walls will drop
D. Energy consumption will increase

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. Insulating materials
B. Conducting materials which are magnetic
C. Conducting materials which are non-magnetic
D. Conducting materials which may or may not be magnetic