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Power Electronics

Power Electronics
The normal way to turn on a diac is by ___________.

None of these
Gate current
Breakover voltage
Gate voltage

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Power Electronics
Power electronics essentially deals with control of a.c. power at ___________.

Frequencies above 20 kHz
Frequencies less than 10 Hz
Frequencies above 1000 kHz
50 Hz frequency

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Power Electronics
Which triggering is the most reliable?

  Gate triggering.
  Forward voltage triggering.
  Thermal triggering.
  dV / dt triggering.

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Power Electronics
Thyristor is nothing but a

 Amplifier with large current gain.
 Amplifier with higher gain.
 Controlled transistor.
  Controlled switch.

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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
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 65.
 3.714.
  37.14.
 60.

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