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Power Electronics

Power Electronics
Which of following is normally ON device

  SIT.
 IGBT.
 TRIAC.
 BJT.

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Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

  37.14.
 3.714.
 65.
 60.

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Power Electronics
IGBT combines the advantages of

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

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

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Power Electronics
A diac has ___________ pn junctions

Three
None of these
Two
Four

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Power Electronics
During reverse recovery time

 charge carrier of junction J1 is swept out.
 charge carrier of junction J2 recombined.
  both B and C.
 charge carrier of junction J3 is swept out.

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