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

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

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Power Electronics
Maximum di / dt in a SCR is

 inversely proportional to L in the circuit.
 inversely proportional to Vm of supply voltage.
 both A and C.
  directly proportional to Vm of supply voltage.

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