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Power Electronics

Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

 P1.
 P2.
  N1.
 N2.

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Power Electronics
Switching frequency of SITH is

 5 KHz.
  100 KHz.
 60 KHz.
 10 KHz.

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

 110 A.
 100 A.
 120 A.
  150 A.

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Power Electronics
When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ?

 Snubber circuit.
 CB.
  Fast acting current limiting device (FACL fuse).
 Voltage clamping device.

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Power Electronics
Which of following is not a power transistor?

 SITS.
  TRIAC.
 IGBTs.
 COOLMOS.

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Power Electronics
A modern power semiconductor device that combines the characteristic of BJT and MOSFET is

 MCT.
 GTO.
 FCT.
  IGBT.

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