The latching current of GTO should be of order

Related Mcqs:

1. If holding current of a thyristor is 2 mA then latching current should be_____?

   A. 0.01 A. B. 0.002 A. C. 0.009 A. D. 0.004 A....

2. 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...

3. Which statement is true for latching current ___________?

   A.It is related to turn off process of the device. B. It is related to conduction process of device. C. It is related to turn on process of the device. D. Both C and D....

4. A GTO can be turned on by applying___________?

   A. Positive gate signal B. Positive drain signal C. Positive source signal D. None of these...

5. An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be_____?

   A. 1500 A. B. 6000 A. C. 2121.32 A. D. 4242.64 A....

6. CB used for over current protection of thyristor operates when the fault current is__________?

   A. of long period B. of short duration C. both (A) and (B) D. neither (A) nor (B)...

7. The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is___________?

   A. 130 μs B. 135 μs C. 140 μs D. 145 μs...

8. 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_____________?

   A. 5, 7 B. 4, 6 C. 7, 5 D. 6, 4...

9. In a full bridge VSI, in order to avoid the short circuit across the DC bus and the undefined AC output voltage condition, the modulating technique should ensure that___________?

   A. Top switch of each leg is on at any instant B. Bottom switch of each leg is on at any instant C. Either A. or B. D. None of these...

10. To meet high current demand we use SCRs in______________?

    A. series connection. B. parallel connection. C. anti parallel connection. D. both B and C....