Power Electronics Power electronics essentially deals with control of a.c. power at ___________. Frequencies above 20 kHz 50 Hz frequency Frequencies above 1000 kHz Frequencies less than 10 Hz Frequencies above 20 kHz 50 Hz frequency Frequencies above 1000 kHz Frequencies less than 10 Hz 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 Leakage current flows through the thyristor in reverse blocking mode. forward conduction mode. both forward and reverse blocking mode. forward blocking mode. reverse blocking mode. forward conduction mode. both forward and reverse blocking mode. forward blocking mode. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Example of a voltage clamping device snubber circuit. fast acting fuse. metal oxide varistor. aluminium block. snubber circuit. fast acting fuse. metal oxide varistor. aluminium block. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics The function of snubber circuit connected across the SCR is to decrease di / dt. suppress dV / dt. increase dV / dt. decrease dV / dt. decrease di / dt. suppress dV / dt. increase dV / dt. decrease dV / dt. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics An SCR is considered to be a semi controlled device because it can be turned OFF but not ON with a gate pulse. it can be turned ON but not OFF with a gate pulse. it conducts only during one half cycle of an alternating current wave. it can be turned ON only during one half cycle of an AC. it can be turned OFF but not ON with a gate pulse. it can be turned ON but not OFF with a gate pulse. it conducts only during one half cycle of an alternating current wave. it can be turned ON only during one half cycle of an AC. ANSWER DOWNLOAD EXAMIANS APP
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