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Power Electronics

Power Electronics
Which following is a two terminal three layer device?

 BJT.
 MOSFET.
 None of above.
  Power dioed.

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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 current rises from 90 % to its final value.
 anode voltage drops from 10 % of its initial value to zero.

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Power Electronics
SITH is also known as

 Silicon controlled rectifier.
 None of these.
  Filled controlled diode.
 Filled controlled rectifier.

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Power Electronics
During reverse recovery time

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

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Power Electronics
How can we protect SCR from thermal conditions ?

  Using heat sink.
 Using CB and fuse.
 Using equalizing circuit.
 Use of snubber circuit.

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

 N2.
 P2.
 P1.
  N1.

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