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_____________?

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In reverse blocking mode of a thyristor______?

A. junction J2 is in reverse bias and J1, J3 is in forward bias. B. junction J3 is in forward bias and J1, J2 in reverse bias. C. junction J1, J3 is in reverse bias and J2 is in forward bias. D. junction J1 and J2 is in forward bias and J3 is in reverse … In reverse blocking mode of a thyristor______?Read More...

If the anode current is 800 A, then the amount of current required to turn off the GTO is about____________?

A. 20 A B. 200 A C. 600 A D. 400 A...

The typical time of rising time lies between______________?

A. 10 – 20 µs B. 40 – 60 µs C. 1 – 4 µs D. 90 – 100 µs...

The control method used for PWM dc – dc converter is______________?

A. Voltage mode control B. Current mode control C. Hysteric control D. All of these...

A carrier based PWM technique in CSI is composed of____________?

A. A switching pulse generator and a shorting pulse generator B. A shorting pulse distributor C. A switching and shorting pulse combination D. All of these...