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Power Electronics

Power Electronics
The device that exhibits negative resistance region is ___________.

Diac
UJT
Triac
Transistor

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Power Electronics
The typical time of rising time lies between

 40 - 60 µs.
 90 - 100 µs.
 10 - 20 µs.
  1 - 4 µs.

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Power Electronics
How can we protect SCR from thermal conditions ?

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

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Power Electronics
Practical way of obtaining static voltage equalization in series connected SCRs is by the use of

 one resistor across the string.
 resistors of different values across each SCR.
 one resistor in series with each SCR.
  resistors of the same value across each SCR.

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Power Electronics
Which of following is normally ON device

 IGBT.
  SIT.
 TRIAC.
 BJT.

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

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

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