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Power Electronics

Power Electronics
A triac is equivalent to two SCRs ___________.

None of these
In series
In inverse-parallel
In parallel

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Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

 120 A.
 100 A.
 110 A.
  150 A.

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

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

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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.
 0.75.
 0.7.
  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
  Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
 Vc1 = Vc2 = Vc3 any value of Ig.
 Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.

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Power Electronics
A diac is simply ___________.

A triac without gate terminal
A single junction device
None of these
A three junction device

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