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Power Electronics

Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

 infinity.
 moderate.
  low.
 high.

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Power Electronics
Typical range of thyristor turn OFF time is

 3 - 500 µs.
 3 - 10 µs.
  3 - 100 µs.
 3 - 50 µs.

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Power Electronics
By which one of the following we can measure the reliability of a string?

  Derating factor.
 Reliability factor.
 Factor of safety.
 String efficient.

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Power Electronics
A UJT has ___________.

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

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Power Electronics
A Triac has three terminals viz ___________

Two main terminal and a gate terminal
Drain, source, gate
Cathode, anode, gate
None of these

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Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

 110 A.
 100 A.
 120 A.
  150 A.

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