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Power Electronics

Power Electronics
A diac is turned on by ___________.

None of these
Gate current
A breakover voltage
Gate voltage

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Power Electronics
Which of following is normally ON device

 TRIAC.
  SIT.
 BJT.
 IGBT.

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Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

Decreases
None of these
Remains the same
Increases

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Power Electronics
A single phase full bridge inverter can operate in load commutation mode in case load consists of

 RL.
  RLC underdamped.
 RLC overdamped.
 RLC critically damped.

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Power Electronics
SITH is also known as

  Filled controlled diode.
 Silicon controlled rectifier.
 None of these.
 Filled controlled rectifier.

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Power Electronics
Spread time is defined as the interval during which

  anode current rises from 90 % to its final value.
 both (A) and (B).
 anode current rises from 10 % to 90 % of its final value.
 anode voltage drops from 10 % of its initial value to zero.

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