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Power Electronics

Power Electronics
A diac has ___________ terminals.

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

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Power Electronics
The latching current of GTO should be of order

 100 mA.
 1 A.
  500 mA.
 2 A.

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Power Electronics
Why resistor is used in Snubber circuit ?

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

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Power Electronics
The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

 1200 V/µs.
 600 V/µs.
 1000 V/µs.
  800 V/µs.

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Power Electronics
SITH is also known as

  Filled controlled diode.
 Filled controlled rectifier.
 Silicon controlled rectifier.
 None of these.

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