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Power Electronics

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

 MOSFET.
 None of above.
 BJT.
  Power dioed.

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Power Electronics
Dynamic equalising circuit is useful

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

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Power Electronics
Snubber circuit is used with SCR

 either series or parallel.
  in parallel.
 anti parallel.
 in series.

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Power Electronics
A diac is simply ___________.

None of these
A triac without gate terminal
A single junction device
A three junction device

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

  N1.
 P1.
 N2.
 P2.

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

  76.3 %.
 83.3 %.
 91.6 %.
 90.9 %.

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