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Power Electronics

Power Electronics
A diac is turned on by ___________.

Gate current
None of these
Gate voltage
A breakover voltage

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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
The typical value of SCR for modern alternator is

 0.5.
 1.5.
 1.2.
 1.0.

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Power Electronics
A diac is simply ___________.

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

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Power Electronics
The maximum di/dt in a SCR is

 Directly proportional to supply voltage.
  Both A and B.
 Inversely proportional to supply voltage.
 Directly proportional to inductance in the circuit.

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

None of these
More than
Equal to
Less than

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