Power Electronics
The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will

 Not turn on.
 Turn on if inductance is removed.
  Turn on.
 Turn on if pulse frequency us increased to two times.

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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 conducts only during one half cycle of an alternating current wave.
 it can be turned ON only during one half cycle of an AC.

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