Heating and Welding

A. Coreless transformers
B. Current transformers
C. Motor-generator set
D. Multi-phase transformer

A. Optical pyrometer
B. Mercury thermometer
C. Alcohol thermometer
D. Any of the above

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

A. lower melting point
B. higher temperature coefficient
C. high specific resistance
D. all of the above

A. arc heating
B. resistance heating
C. induction heating
D. dielectric heating

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

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. Prandtl number
B. Grashoff number
C. Pecelet number
D. Nusselt number

A. Thermal ion release principle
B. Nucleate heating principle
C. Resistance heating principle
D. Electro-magnetic induction princi¬ple

A. ablation
B. radiation
C. viscous dissipation
D. irradiation