Power Electronics When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ? CB. Fast acting current limiting device (FACL fuse). Snubber circuit. Voltage clamping device. CB. Fast acting current limiting device (FACL fuse). Snubber circuit. Voltage clamping device. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Power electronics essentially deals with control of a.c. power at ___________. Frequencies less than 10 Hz 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 ANSWER DOWNLOAD EXAMIANS APP
Power Electronics 60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is 76.3 %. 83.3 %. 90.9 %. 91.6 %. 76.3 %. 83.3 %. 90.9 %. 91.6 %. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Spread time is defined as the interval during which anode current rises from 90 % to its final value. anode voltage drops from 10 % of its initial value to zero. both (A) and (B). anode current rises from 10 % to 90 % of its final value. anode current rises from 90 % to its final value. anode voltage drops from 10 % of its initial value to zero. both (A) and (B). anode current rises from 10 % to 90 % of its final value. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics What may happen high dV / dt? Both A and B. Unwanted turn ON. Anyone of these. Breakdown of J2 junction. Both A and B. Unwanted turn ON. Anyone of these. Breakdown of J2 junction. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics The UJT may be used as ___________. A rectifier Am amplifier None of these A sawtooth generator A rectifier Am amplifier None of these A sawtooth generator ANSWER DOWNLOAD EXAMIANS APP
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