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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.
  37.14.
 65.
 3.714.

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Power Electronics
Thyristor is nothing but a

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

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Power Electronics
The triac is ___________.

A four-terminal device
None of these
Like a bidirectional SCR
Not a thyristor

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Power Electronics
A power semiconductor may undergo damage due to

 Low dv/dt.
  High di/dt.
 Low di/dt.
 High dv/dt.

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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.
 0.2.
 0.7.

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Power Electronics
A diac is ___________ switch

None of these
A mechanical
A d.c.
An c.

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