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Power Electronics

Power Electronics
The typical time of rising time lies between

 40 - 60 µs.
 90 - 100 µs.
 10 - 20 µs.
  1 - 4 µs.

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Power Electronics
After proper turn on of thyristor

  gate signal must be removed.
 gate signal is always present.
None of these
 gate signal should present but can be removed.

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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 %.
 90.9 %.
  76.3 %.
 91.6 %.

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Power Electronics
Leakage current flows through the thyristor in

 forward conduction mode.
  both forward and reverse blocking mode.
 forward blocking mode.
 reverse blocking mode.

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Power Electronics
Spread time is defined as the interval during which

 both (A) and (B).
 anode current rises from 10 % to 90 % of its final value.
 anode voltage drops from 10 % of its initial value to zero.
  anode current rises from 90 % to its final value.

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Power Electronics
Which of following devices has highest di/dt and dv/dt capability?

  GTO.
 SITH.
 SCR.
 SIT.

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