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
  0.3 ohm
 3.0 ohm
 0.03 ohm

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Power Electronics
In reverse blocking mode of a thyristor

 junction J2 is in reverse bias and J1, J3 is in forward bias.
 junction J1 and J2 is in forward bias and J3 is in reverse bias.
 junction J3 is in forward bias and J1, J2 in reverse bias.
  junction J1, J3 is in reverse bias and J2 is in forward bias.

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