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Power Electronics

Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

 100 A.
  150 A.
 120 A.
 110 A.

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Power Electronics
During reverse recovery time

 charge carrier of junction J2 recombined.
 charge carrier of junction J1 is swept out.
  both B and C.
 charge carrier of junction J3 is swept out.

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Power Electronics
Which of following is not a power transistor?

 COOLMOS.
  TRIAC.
 IGBTs.
 SITS.

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Power Electronics
What is used to protect a thyristor from high di / dt conditions?

 Snubber circuit.
  Inductor.
 Fuse.
 Voltage clamping device.

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Power Electronics
Dynamic equalising circuit is useful

 to limit di / dt of SCR.
 for voltage equalisation.
  both B and C.
 to limit dV / dt of SCR.

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Power Electronics
Which semiconductor device acts like a diode and two transistor?

 UJT.
  Triac.
 SCR.
 Diac.

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