Heating and Welding

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. zero
B. 0.707 lagging
C. unity
D. 0.707 leading

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. T1
B. T2
C. T3
D. T*

A. Variation of resistance
B. Variation of voltage
C. Periodical switching on and off of the supply
D. All of the above methods

A. to stabilize the arc
B. to imprpve, power factor
C. to reduce severity of the surge
D. none of the above

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