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Power Electronics

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

Equal to
More than
None of these
Less than

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Power Electronics
A diac is turned on by ___________.

Gate current
None of these
Gate voltage
A breakover voltage

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Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

 P1.
  N1.
 P2.
 N2.

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Power Electronics
Gate circuit or triggering circuit of a thyristor is

 high power circuit.
 magnetic circuit.
  lower power circuit.
 may be low power or high power circuit.

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Power Electronics
What may happen high dV / dt?

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

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Power Electronics
What is used to protect a thyristor from high di / dt conditions?

  Inductor.
 Fuse.
 Voltage clamping device.
 Snubber circuit.

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