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Power Electronics

Power Electronics
A UJT has ___________.

One pn junction
Two pn junctions
None of these
Three pn junctions

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Power Electronics
A power semiconductor may undergo damage due to

 High dv/dt.
  High di/dt.
 Low di/dt.
 Low dv/dt.

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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

 60.
 3.714.
  37.14.
 65.

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

Lightly
Moderately
Heavily
None of these

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Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

 0.75.
  0.25.
 0.7.
 0.2.

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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?

  111.9 ohm
 115 ohm
 108 ohm
 11.19 ohm

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