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Power Electronics

Power Electronics
The triac is ___________.

Not a thyristor
A four-terminal device
Like a bidirectional SCR
None of these

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Power Electronics
Gate circuit or triggering circuit of a thyristor is

 may be low power or high power circuit.
 high power circuit.
 magnetic circuit.
  lower power circuit.

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Power Electronics
A power semiconductor may undergo damage due to

 Low di/dt.
 Low dv/dt.
 High dv/dt.
  High di/dt.

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Power Electronics
The maximum di/dt in a SCR is

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

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Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

 3 µs.
 3.1 µs
 3.2 µs
  3.3 µs

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Power Electronics
What happen due to high di / dt?

 None of these.
  Local hot spot.
 Breakdown of junction.
 Insulation failure.

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