Power Electronics A diac has ___________ pn junctions Three None of these Four Two Three None of these Four Two ANSWER DOWNLOAD EXAMIANS APP
Power Electronics In a UJT, the p-type emitter is ___________ doped None of these Moderately Lightly Heavily None of these Moderately Lightly Heavily ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Anode current in an SCR consists of electrons only. holes only. Both electron and holes. either electron or holes. electrons only. holes only. Both electron and holes. either electron or holes. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Power electronics essentially deals with control of a.c. power at ___________. 50 Hz frequency Frequencies above 20 kHz Frequencies less than 10 Hz Frequencies above 1000 kHz 50 Hz frequency Frequencies above 20 kHz Frequencies less than 10 Hz Frequencies above 1000 kHz 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. 4, 6. 6, 4. 5, 7. 7, 5. 4, 6. 6, 4. 5, 7. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt? 600 V/µs. 800 V/µs. 1000 V/µs. 1200 V/µs. 600 V/µs. 800 V/µs. 1000 V/µs. 1200 V/µs. ANSWER DOWNLOAD EXAMIANS APP
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