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 83.3 %. 91.6 %. 76.3 %. 90.9 %. 83.3 %. 91.6 %. 76.3 %. 90.9 %. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics In a UJT, the p-type emitter is ___________ doped Moderately Lightly None of these Heavily Moderately Lightly None of these Heavily 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
Power Electronics The maximum di/dt in a SCR is Inversely proportional to supply voltage. Both A and B. Directly proportional to inductance in the circuit. Directly proportional to supply voltage. Inversely proportional to supply voltage. Both A and B. Directly proportional to inductance in the circuit. Directly proportional to supply voltage. ANSWER DOWNLOAD EXAMIANS APP
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 ? Voltage clamping device. Snubber circuit. Fast acting current limiting device (FACL fuse). CB. Voltage clamping device. Snubber circuit. Fast acting current limiting device (FACL fuse). CB. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Why resistor is used in Snubber circuit ? To minimize the loss . All of these. To minimize the discharging current. To minimize the charging current. To minimize the loss . All of these. To minimize the discharging current. To minimize the charging current. ANSWER DOWNLOAD EXAMIANS APP
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