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Power Electronics

Power Electronics
After peak point, the UJT operates in the ___________ region.

Saturation
Cut-off
Negative resistance
None of these

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Power Electronics
Thyristor is nothing but a

 Amplifier with higher gain.
 Amplifier with large current gain.
  Controlled switch.
 Controlled transistor.

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Power Electronics
Dynamic equalising circuit is useful

 to limit dV / dt of SCR.
 to limit di / dt of SCR.
  both B and C.
 for voltage equalisation.

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Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 23 mA.
  10 mA.
 40 mA.
 60 mA.

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Power Electronics
Under normal operating condition voltage clamping device offers impedance of

 low value.
 moderate value.
  high value.
 zero value.

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Power Electronics
Power electronics essentially deals with control of a.c. power at ___________.

50 Hz frequency
Frequencies above 20 kHz
Frequencies above 1000 kHz
Frequencies less than 10 Hz

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