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Power Electronics

Power Electronics
A diac has ___________ semiconductor layers

Three
Two
None of these
Four

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Power Electronics
For series connected SCR’s dynamic equalising circuit consists of

 series R and diode with C across R.
  R and C in series but with diode across R.
 R and C in series but with diode across C.
 series R and diode with C across R.

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

 P1.
 N2.
  N1.
 P2.

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Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

 0.3 ohm
 0.03 ohm
 3.0 ohm
  0.3 ohm

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Power Electronics
Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.

  100 µs.
 300 µs.
 150 µs.
 200 µs.

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Power Electronics
Maximum power loss occurs during

 spread time.
 all.
 delay time.
  rise time.

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