A. Voltage drop in arc
B. Voltage drop at the anode
C. Voltage drop at the cathode
D. All of the above
A. Mechanical rectifiers
B. Copper oxide rectifiers
C. Selenium rectifiers
D. Electrolytic rectifiers
E. Mercury arc rectifiers
A. 80%
B. 70%
C. 60%
D. 40%
A. graphite
B. boron carbide
C. aluminium
D. copper
A. Yes
B. No
A. Yes
B. No
A. Yes
B. No
A. Resistance only
B. Inductance only
C. Capacitance only
D. Inductance and capacitance
A. variation in coil current
B. variation in voltage to the coil
C. change of number of turns of coil
D. the resistance of magnetic path
A. unchanged inductance
B. increased inductance
C. zero inductance
D. reduced inductance