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Power Electronics

Power Electronics
A diac has ___________ semiconductor layers

Three
None of these
Four
Two

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

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Power Electronics
The typical time of rising time lies between

 10 - 20 µs.
 90 - 100 µs.
 40 - 60 µs.
  1 - 4 µs.

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Power Electronics
To meet high current demand we use SCRs in

 anti parallel connection.
  parallel connection.
 series connection.
 both B and C.

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Power Electronics
For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?

 108 ohm
  111.9 ohm
 115 ohm
 11.19 ohm

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Power Electronics
Which semiconductor device acts like a diode and two transistor?

 Diac.
  Triac.
 SCR.
 UJT.

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