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Power Electronics

Power Electronics
Thyristor can be protected from over voltages by using

  voltage clamping device.
 snubber circuit.
 fuse.
 heat sink.

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Power Electronics
Switching frequency of SITH is

 60 KHz.
 5 KHz.
 10 KHz.
  100 KHz.

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Power Electronics
A Triac has three terminals viz ___________

Drain, source, gate
None of these
Two main terminal and a gate terminal
Cathode, anode, gate

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

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Power Electronics
Snubber circuit is used with SCR

 anti parallel.
  in parallel.
 in series.
 either series or parallel.

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Power Electronics
SCRs are used in series to meet

  high voltage demand.
 low current demand.
 high current demand.
 low voltage demand.

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