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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
None of these
More than
Less than

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Power Electronics
The normal way to turn on a diac is by ___________.

None of these
Gate voltage
Breakover voltage
Gate current

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Power Electronics
The typical value of SCR for modern alternator is

 1.0.
 1.5.
 1.2.
 0.5.

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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
A triac is equivalent to two SCRs ___________.

In series
In inverse-parallel
In parallel
None of these

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

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

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