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Power Electronics

Power Electronics
Which of following is not a power transistor?

 SITS.
 COOLMOS.
 IGBTs.
  TRIAC.

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Power Electronics
A diac has ___________ pn junctions

Four
None of these
Two
Three

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Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

 600 V/µs.
  800 V/µs.
 1000 V/µs.
 1200 V/µs.

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Power Electronics
A triac is equivalent to two SCRs ___________.

In parallel
None of these
In series
In inverse-parallel

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Power Electronics
A GTO can be turned on by applying

 None of these.
 Positive source signal.
  Positive gate signal.
 Positive drain signal.

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Power Electronics
What may happen high dV / dt?

 Unwanted turn ON.
 Breakdown of J2 junction.
  Both A and B.
 Anyone of these.

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