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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

  150 A.
 110 A.
 100 A.
 120 A.

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Power Electronics
What happen due to high di / dt?

 Breakdown of junction.
 None of these.
 Insulation failure.
  Local hot spot.

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Power Electronics
Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.

 200 µs.
 150 µs.
  100 µs.
 300 µs.

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Power Electronics
BCT is used for

 High power current control.
  High power phase control.
 Low power current control.
 Low power phase control.

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Power Electronics
Materials used in heat sink should have

 high melting point.
 large surface area.
  All of these.
 high thermal conductivity.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Rise time.
 Delay time.
 Same for every case.
  Spread time.

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