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Power Electronics

Power Electronics
In a UJT, the p-type emitter is ___________ doped

Lightly
Moderately
Heavily
None of these

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Power Electronics
Which of following is normally ON device

 TRIAC.
 BJT.
  SIT.
 IGBT.

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Power Electronics
The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant

None of these
Transistor
SCR
UJT

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Power Electronics
A single phase full bridge inverter can operated in load commutation mode in case load consist of

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

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Power Electronics
Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

 6 KV.
 2 KV.
 10 KV.
  8 KV.

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Power Electronics
Spread time is defined as the interval during which

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

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