- (A) self restoring property of mercury
- (B) high ionization potential
- (C) energy spent in overcoming the electrostatic field
- (D) high temperature inside the rectifier
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- (A) anode drop and cathode drop
- (B) anode drop and arc drop
- (C) cathode drop and arc drop
- (D) anode drop, cathode drop and arc drop
- (A) 5.4 V
- (B) 8.4 V
- (C) 10.4 V
- (D) 16.4 V
- (A) 2000 A
- (B) 1500 A
- (C) 1000 A
- (D) 500 A
- (A) low power factor
- (B) high power factor
- (C) zero power factor
- (D) none of the above
- (A) Illumination
- (B) Electrolysis
- (C) Variable speed operation
- (D) Traction
- (A) anode
- (B) cathode
- (C) shell bottom
- (D) mercury pool
- (A) Telephones
- (B) Relays
- (C) Time switches
- (D) All of the above
- (A) Synchronous motor
- (B) Squirrel cage induction motor
- (C) Slip ring induction motor
- (D) Any of the above
- (A) same
- (B) less
- (C) double
- (D) three times
