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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.

Less than
More than
None of these
Equal to

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Power Electronics
Which of the following is disadvantage of fast recovery diodes?

  Doping is carried out.
 Recovery is only 50 µs.
 None of these.
 Recovery is only 5 µs.

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

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

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Power Electronics
A diac is simply ___________.

A triac without gate terminal
A three junction device
None of these
A single junction device

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Power Electronics
A single phase full bridge inverter can operate in load commutation mode in case load consists of

  RLC underdamped.
 RLC overdamped.
 RL.
 RLC critically damped.

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Power Electronics
Thyristor is nothing but a

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

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