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Thyristor

4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is_____________________?

by

A. 0.75
B. 0.7
C. 0.2
D. 0.25

Categories Electronics MCQs Tags Thyristor Leave a comment

Typical range of thyristor turn OFF time is______________?

by

A. 3 – 10 µs
B. 3 – 50 µs
C. 3 – 100 µs
D. 3 – 500 µs

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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_____________?

by

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

Categories Electronics MCQs Tags Thyristor Leave a comment

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______________________?

by

A. 76.3 %
B. 91.6 %
C. 83.3 %
D. 90.9 %

Categories Electronics MCQs Tags Thyristor Leave a comment

Dynamic equalizing circuit is used for________________?

by

A. Equal division of voltage across each thyristor
B. Equal division of current through each thyristor in parallel
C. Equal division of voltage across each thyristor in parallel
D. Equal division of current through each thyristor in series

Categories Electronics MCQs Tags Thyristor Leave a comment

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

by

A. Of Long Period
B. Of short duration
C. Both (A) and (B)
D. Neither (A) nor (B)

Categories Electronics MCQs Tags Thyristor Leave a comment
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