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Power Electronics

Power Electronics
Snubber circuit is used with SCR

 anti parallel.
 in series.
  in parallel.
 either series or parallel.

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Power Electronics
What may happen high dV / dt?

  Both A and B.
 Breakdown of J2 junction.
 Anyone of these.
 Unwanted turn ON.

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Power Electronics
The UJT may be used as ___________.

A sawtooth generator
Am amplifier
None of these
A rectifier

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Power Electronics
Thyristor can be protected from over voltages by using

  voltage clamping device.
 snubber circuit.
 heat sink.
 fuse.

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

  Thyristor.
 MOSFETs.
 TRIACs.
 Semi conductor diodes.

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 91.6 %.
 83.3 %.
  76.3 %.
 90.9 %.

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