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Power Electronics

Power Electronics
The UJT may be used as ___________.

Am amplifier
None of these
A sawtooth generator
A rectifier

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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.
 0.7.
 0.2.
  0.25.

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Power Electronics
Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

 10 KV.
  8 KV.
 6 KV.
 2 KV.

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

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

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Power Electronics
How can we protect SCR from thermal conditions ?

  Using heat sink.
 Use of snubber circuit.
 Using equalizing circuit.
 Using CB and fuse.

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Power Electronics
Compared to transistor, ______________ have lower on state conduction losses and higher power handling capability

 MOSFETs.
 TRIACs.
  Thyristor.
 Semi conductor diodes.

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