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Power Electronics

Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

  10 mA.
 60 mA.
 23 mA.
 40 mA.

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Power Electronics
Light triggering mainly used in

  high voltage direct current transmission.
 medium voltage direct current transmission.
  all of these.
 low - voltage direct current transmission.

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

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

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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?

 3.1 µs
 3.2 µs
 3 µs.
  3.3 µs

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Power Electronics
Which of the following is not a characteristic of UJT?

Bilateral conduction
Peak-point voltage
Negative resistance
Intrinsic stand off ratio

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Power Electronics
A single phase full bridge inverter can operated in load commutation mode in case load consist of

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

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