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Power Electronics

Power Electronics
A diac has ___________ terminals.

Three
Four
Two
None of these

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

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Power Electronics
The maximum di/dt in a SCR is

  Both A and B.
 Directly proportional to inductance in the circuit.
 Directly proportional to supply voltage.
 Inversely proportional to supply voltage.

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Power Electronics
Power transistor are type of

 IGBTs.
  All of above.
 MOSFETs.
 BJTs.

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Power Electronics
The normal way to turn on a diac is by ___________.

Gate current
Gate voltage
None of these
Breakover voltage

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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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