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Power Electronics

Power Electronics
A triac is equivalent to two SCRs ___________.

None of these
In series
In parallel
In inverse-parallel

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

 P2.
 P1.
 N2.
  N1.

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Power Electronics
A power semiconductor may undergo damage due to

 Low dv/dt.
  High di/dt.
 Low di/dt.
 High dv/dt.

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Power Electronics
The function of snubber circuit connected across the SCR is to

  suppress dV / dt.
 decrease di / dt.
 increase dV / dt.
 decrease dV / dt.

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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
 Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.

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Power Electronics
A thyristor can termed as

 Both a and B.
 Square wave switch.
 AC switch.
  DC switch.

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