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Power Electronics

Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

 0.2.
  0.25.
 0.7.
 0.75.

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Power Electronics
The normal way to turn on a diac is by ___________.

None of these
Breakover voltage
Gate current
Gate voltage

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

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

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

 P2.
 N2.
 P1.
  N1.

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Power Electronics
After proper turn on of thyristor

 gate signal is always present.
 gate signal should present but can be removed.
None of these
  gate signal must be removed.

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

Diac
Triac
Transistor
UJT

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