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Power Electronics

Power Electronics
A diac is turned on by ___________.

A breakover voltage
Gate current
Gate voltage
None of these

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Power Electronics
Thermal voltage VT can be given by

 qT/K.
 KT/q.
 (K2/q)(T + 1/T - 1).
  Kq/T.

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Power Electronics
Which semiconductor device acts like a diode and two transistor?

 SCR.
 Diac.
 UJT.
  Triac.

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Power Electronics
A diac has ___________ terminals.

Four
Three
None of these
Two

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Power Electronics
Thyristor is nothing but a

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

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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.01 A.
 0.009 A.
 0.002 A.
  0.004 A.

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