Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

 1000 V/µs.
 1200 V/µs.
 600 V/µs.
  800 V/µs.

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Power Electronics
An SCR is considered to be a semi controlled device because

 it can be turned ON but not OFF with a gate pulse.
 it can be turned OFF but not ON with a gate pulse.
 it can be turned ON only during one half cycle of an AC.
 it conducts only during one half cycle of an alternating current wave.

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