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Power Electronics

Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

 N2.
 P1.
 P2.
  N1.

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Power Electronics
Which of following is not a power transistor?

 SITS.
  TRIAC.
 COOLMOS.
 IGBTs.

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Power Electronics
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

Negative resistance
None of these
Cut-off
Saturation

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Power Electronics
The maximum di/dt in a SCR is

 Inversely proportional to supply voltage.
 Directly proportional to inductance in the circuit.
  Both A and B.
 Directly proportional to supply voltage.

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Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

  76.3 %.
 83.3 %.
 91.6 %.
 90.9 %.

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Power Electronics
A diac has ___________ pn junctions

None of these
Two
Three
Four

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