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Power Electronics

Power Electronics
Which semiconductor device acts like a diode and two transistor?

 SCR.
  Triac.
 Diac.
 UJT.

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

None of these
Essentially remains the same
Increases
Decreases

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Power Electronics
Which of the following is disadvantage of fast recovery diodes?

  Doping is carried out.
 Recovery is only 50 µs.
 None of these.
 Recovery is only 5 µs.

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Power Electronics
Thermal voltage VT can be given by

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

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Power Electronics
For series connected SCR’s dynamic equalising circuit consists of

 series R and diode with C across R.
 series R and diode with C across R.
 R and C in series but with diode across C.
  R and C in series but with diode across R.

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Power Electronics
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

Cut-off
None of these
Negative resistance
Saturation

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