Power Electronics Power electronics essentially deals with control of a.c. power at ___________. 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 50 Hz frequency Frequencies above 20 kHz 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? 1200 V/µs. 600 V/µs. 800 V/µs. 1000 V/µs. 1200 V/µs. 600 V/µs. 800 V/µs. 1000 V/µs. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Which statement is true for latching current ? It is related to conduction process of device. It is related to turn off process of the device. Both C and D. It is related to turn on process of the device. It is related to conduction process of device. It is related to turn off process of the device. Both C and D. It is related to turn on process of the device. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics SCR will be turned off when anode current is less than holding current. < latching current but greater than holding current and gate signal is 0. both (A) and (B). < latching current but greater than holding current and gate signal is present. less than holding current. < latching current but greater than holding current and gate signal is 0. both (A) and (B). < latching current but greater than holding current and gate signal is present. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics SCRs are used in series to meet low current demand. high voltage demand. high current demand. low voltage demand. low current demand. high voltage demand. high current demand. low voltage demand. 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 ? Snubber circuit. Fast acting current limiting device (FACL fuse). Voltage clamping device. CB. Snubber circuit. Fast acting current limiting device (FACL fuse). Voltage clamping device. CB. ANSWER DOWNLOAD EXAMIANS APP
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