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Power Electronics

Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.009 A.
  0.004 A.
 0.01 A.
 0.002 A.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Rise time.
 Same for every case.
 Delay time.
  Spread time.

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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.
 0.7.
  0.25.
 0.75.

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Power Electronics
The triac is ___________.

None of these
Like a bidirectional SCR
Not a thyristor
A four-terminal device

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Power Electronics
A triac has ___________ semiconductor layers.

Four
Five
Three
Two

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

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

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