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Power Electronics

Power Electronics
Which of following is not a power transistor?

 IGBTs.
 COOLMOS.
 SITS.
  TRIAC.

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Power Electronics
IGBT combines the advantages of

 SITs and MOSFETs.
  BJTs and MOSFETs.
 None of these.
 BJTs and SITs.

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Power Electronics
A triac can pass a portion of ___________ half-cycle through the load.

Only positive
None of these
Both positive and negative
Only negative

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

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Power Electronics
Which of the following is not a characteristic of UJT?

Intrinsic stand off ratio
Bilateral conduction
Peak-point voltage
Negative resistance

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Power Electronics
In a UJT, the p-type emitter is ___________ doped

Lightly
Moderately
None of these
Heavily

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