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Power Electronics

Power Electronics
COOLMOS device can be used in application up to power range of

  2 KVA.
 1 KVA.
 500 VA.
 100 KVA.

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Power Electronics
Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.

  100 µs.
 300 µs.
 200 µs.
 150 µs.

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Power Electronics
A diac has ___________ pn junctions

Four
None of these
Three
Two

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Power Electronics
What may happen high dV / dt?

 Breakdown of J2 junction.
  Both A and B.
 Anyone of these.
 Unwanted turn ON.

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Power Electronics
A triac is equivalent to two SCRs ___________.

In series
In parallel
None of these
In inverse-parallel

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

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