Power Electronics An SCR is considered to be a semi controlled device because it conducts only during one half cycle of an alternating current wave. it can be turned ON but not OFF with a gate pulse. it can be turned OFF but not ON with a gate pulse. it can be turned ON only during one half cycle of an AC. it conducts only during one half cycle of an alternating current wave. it can be turned ON but not OFF with a gate pulse. it can be turned OFF but not ON with a gate pulse. it can be turned ON only during one half cycle of an AC. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Which of the following is disadvantage of fast recovery diodes? Recovery is only 50 µs. None of these. Doping is carried out. Recovery is only 5 µs. Recovery is only 50 µs. None of these. Doping is carried out. Recovery is only 5 µs. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be 7, 5. 6, 4. 5, 7. 4, 6. 7, 5. 6, 4. 5, 7. 4, 6. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance? 108 ohm 11.19 ohm 111.9 ohm 115 ohm 108 ohm 11.19 ohm 111.9 ohm 115 ohm ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Why resistor is used in Snubber circuit ? To minimize the loss . To minimize the charging current. All of these. To minimize the discharging current. To minimize the loss . To minimize the charging current. All of these. To minimize the discharging current. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Dynamic equalising circuit is useful to limit di / dt of SCR. to limit dV / dt of SCR. both B and C. for voltage equalisation. to limit di / dt of SCR. to limit dV / dt of SCR. both B and C. for voltage equalisation. ANSWER DOWNLOAD EXAMIANS APP
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