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Power Electronics

Power Electronics
A thyristor can termed as

 AC switch.
  DC switch.
 Square wave switch.
 Both a and B.

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Power Electronics
After peak point, the UJT operates in the ___________ region.

Saturation
Cut-off
None of these
Negative resistance

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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

 60.
 70.
 90.
  80.

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Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

Less than
None of these
More than
Equal to

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Power Electronics
The function of snubber circuit connected across the SCR is to

 increase dV / dt.
  suppress dV / dt.
 decrease dV / dt.
 decrease di / dt.

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

None of these
Gate voltage
Gate current
Breakover voltage

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