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Power Electronics

Power Electronics
A diac has ___________ terminals.

None of these
Two
Four
Three

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Power Electronics
Anode current in an SCR consists of

  holes only.
  either electron or holes.
  Both electron and holes.
  electrons only.

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Power Electronics
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

Saturation
None of these
Cut-off
Negative resistance

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Power Electronics
IGBT combines the advantages of

 SITs and MOSFETs.
 None of these.
 BJTs and SITs.
  BJTs and MOSFETs.

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

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Power Electronics
To meet high current demand we use SCRs in

 series connection.
 both B and C.
  parallel connection.
 anti parallel connection.

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