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Power Electronics

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

 60.
 65.
  37.14.
 3.714.

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Power Electronics
Which statement is true for latching current ?

  It is related to turn on process of the device.
 It is related to conduction process of device.
 It is related to turn off process of the device.
 Both C and D.

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Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

Less than
None of these
More than
Equal to

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Power Electronics
Materials used in heat sink should have

 large surface area.
 high melting point.
 high thermal conductivity.
  All of these.

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Power Electronics
Which of following is not a power transistor?

 COOLMOS.
  TRIAC.
 IGBTs.
 SITS.

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

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

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