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Power Electronics

Power Electronics
A diac is turned on by ___________.

Gate current
Gate voltage
A breakover voltage
None of these

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Power Electronics
Typical range of thyristor turn OFF time is

 3 - 50 µs.
 3 - 10 µs.
  3 - 100 µs.
 3 - 500 µs.

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Power Electronics
The function of snubber circuit connected across the SCR is to

 decrease dV / dt.
 decrease di / dt.
  suppress dV / dt.
 increase dV / dt.

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Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

 moderate.
 high.
 infinity.
  low.

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Power Electronics
Gate circuit or triggering circuit of a thyristor is

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

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Power Electronics
The maximum di/dt in a SCR is

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

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