Rectifiers and Converters To produce cathode spot in a mercury arc rectifier an auxiliary electrode is used anode is heated tube is evacuated low mercury vapour pressures are used an auxiliary electrode is used anode is heated tube is evacuated low mercury vapour pressures are used ANSWER DOWNLOAD EXAMIANS APP
Rectifiers and Converters In phase-shift control method the control is carried out by varying the of grid voltage. polarity All of the listed here magnitude phase polarity All of the listed here magnitude phase ANSWER DOWNLOAD EXAMIANS APP
Rectifiers and Converters In a rotary converter armature currents are partly a.c. and partly d.c. a.c. only None of the listed here d.c. only partly a.c. and partly d.c. a.c. only None of the listed here d.c. only ANSWER DOWNLOAD EXAMIANS APP
Rectifiers and Converters The ionization potential of mercury is approximately 5.4 V None of the listed here 16.4 V 10.4 V 5.4 V None of the listed here 16.4 V 10.4 V ANSWER DOWNLOAD EXAMIANS APP
Rectifiers and Converters Ageing of a selenium rectifier may change the output voltage by 15 to 20 per cent 25 to 30 per cent None of the listed here 5 to 10 per cent 15 to 20 per cent 25 to 30 per cent None of the listed here 5 to 10 per cent ANSWER DOWNLOAD EXAMIANS APP
Rectifiers and Converters A commutating rectifier consists of commutator driven by A D.C. shunt motor A D.C. series motor A synchronous motor An induction motor A D.C. shunt motor A D.C. series motor A synchronous motor An induction motor ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS