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Power Electronics

Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 60 mA.
 40 mA.
 23 mA.
  10 mA.

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Power Electronics
The normal way to turn on a diac is by ___________.

Gate current
Gate voltage
Breakover voltage
None of these

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

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Power Electronics
A triac is equivalent to two SCRs ___________.

In parallel
None of these
In inverse-parallel
In series

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Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

 0.7.
  0.25.
 0.2.
 0.75.

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Power Electronics
A single phase full bridge inverter can operated in load commutation mode in case load consist of

 RL.
 RLC critically damped.
 RLC underdamped.
 RLC overdamped.

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