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Power Electronics

Power Electronics
A triac is a ___________ switch

None of these
Unidirectional
Mechanical
Bidirectional

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 1500 A.
 2121.32 A.
 6000 A.
 4242.64 A.

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Power Electronics
During reverse recovery time

 charge carrier of junction J3 is swept out.
 charge carrier of junction J1 is swept out.
 charge carrier of junction J2 recombined.
  both B and C.

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Power Electronics
Why resistor is used in Snubber circuit ?

  To minimize the discharging current.
 To minimize the charging current.
 To minimize the loss .
 All of these.

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Power Electronics
Which triggering is the most reliable?

  Thermal triggering.
  dV / dt triggering.
  Gate triggering.
  Forward voltage triggering.

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Power Electronics
The typical value of SCR for modern alternator is

 0.5.
 1.2.
 1.0.
 1.5.

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