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Power Electronics

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

 SCR.
 UJT.
 Diac.
  Triac.

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Power Electronics
Which of following is not a power transistor?

  TRIAC.
 COOLMOS.
 IGBTs.
 SITS.

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Power Electronics
A diac is turned on by ___________.

Gate current
A breakover voltage
None of these
Gate voltage

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Power Electronics
Thermal voltage VT can be given by

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

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Power Electronics
Under normal operating condition voltage clamping device offers impedance of

  high value.
 zero value.
 moderate value.
 low value.

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 6000 A.
 1500 A.
 4242.64 A.
 2121.32 A.

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