Category: Heating and Welding

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

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

A. series
B. parallel
C. series-parallel connections
D. star-delta connections
E. all of the above ways

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

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

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

A. induced current flow through the charge
B. hysteresis loss taking place below curie temperature
C. due to hysteresis loss as well as eddy current loss takingplace in the charge
D. none of the above factors

A. To avoid initial rush of current
B. To avoid change in kW rating with temperature
C. Both (A) and (B)
D. Either (A) or (B)

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

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