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Power Electronics

Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 65.
 3.714.
  37.14.
 60.

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 1500 A.
 2121.32 A.
 4242.64 A.
 6000 A.

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Power Electronics
A GTO can be turned on by applying

 Positive source signal.
 Positive drain signal.
  Positive gate signal.
 None of these.

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

  GTO.
 SITH.
 SIT.
 SCR.

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Power Electronics
The typical time of rising time lies between

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

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Power Electronics
The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will

 Turn on if pulse frequency us increased to two times.
 Turn on if inductance is removed.
  Turn on.
 Not turn on.

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