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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.
 0.7.
 0.75.
  0.25.

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Power Electronics
Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then

  Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
 Vc1 = Vc2 = Vc3 any value of Ig.
 Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
 Vc1 > Vc2 > Vc3 when Ig1= Ig2

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Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 60.
 65.
 3.714.
  37.14.

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Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

Decreases
Increases
Remains the same
None of these

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Power Electronics
A diac has ___________ semiconductor layers

None of these
Three
Four
Two

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Power Electronics
The typical value of SCR for modern alternator is

 1.5.
 0.5.
 1.0.
 1.2.

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