A. Current
B. Voltage
C. Power factor
D. All of the above
A. to stabilize the arc
B. to imprpve, power factor
C. to reduce severity of the surge
D. none of the above
A. Resistance heating
B. Dielectric heating
C. Arc heating
D. Induction heating
A. nickel copper
B. nichrome
C. silicon carbide
D. silver
A. Unity
B. Low, lagging
C. Low, leading
D. Any of the above
A. Water
B. Steam
C. Sold ice
D. Melting ice
A. Variation of resistance
B. Variation of voltage
C. Periodical switching on and off of the supply
D. All of the above methods