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Power Electronics

Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

Remains the same
Increases
None of these
Decreases

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

  Inductor.
 Snubber circuit.
 Voltage clamping device.
 Fuse.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Rise time.
 Same for every case.
  Spread time.
 Delay time.

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Power Electronics
During reverse recovery time

  both B and C.
 charge carrier of junction J2 recombined.
 charge carrier of junction J1 is swept out.
 charge carrier of junction J3 is swept out.

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Power Electronics
The typical value of SCR for modern alternator is

 1.2.
 1.0.
 1.5.
 0.5.

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

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

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