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Power Electronics

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

 P1.
 P2.
 N2.
  N1.

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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 %.
 90.9 %.
 91.6 %.
 83.3 %.

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Power Electronics
Compared to transistor, ______________ have lower on state conduction losses and higher power handling capability

  Thyristor.
 MOSFETs.
 Semi conductor diodes.
 TRIACs.

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Power Electronics
When the temperature increases, the intrinsic stand off ratio ___________.

Essentially remains the same
Increases
None of these
Decreases

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Power Electronics
Thermal voltage VT can be given by

 KT/q.
 qT/K.
 (K2/q)(T + 1/T - 1).
  Kq/T.

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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.
  150 A.
 120 A.

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