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Power Electronics

Power Electronics
Typical range of thyristor turn OFF time is

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

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Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

  N1.
 P1.
 N2.
 P2.

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Power Electronics
Anode current in an SCR consists of

  electrons only.
  holes only.
  Both electron and holes.
  either electron or holes.

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Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

 600 V/µs.
  800 V/µs.
 1000 V/µs.
 1200 V/µs.

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

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

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Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

 0.75.
  0.25.
 0.7.
 0.2.

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