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Power Electronics

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

 23 mA.
 40 mA.
  10 mA.
 60 mA.

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Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

 0.3 ohm
 0.03 ohm
  0.3 ohm
 3.0 ohm

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Power Electronics
Dynamic equalising circuit is useful

 for voltage equalisation.
  both B and C.
 to limit di / dt of SCR.
 to limit dV / dt of SCR.

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Power Electronics
The maximum di/dt in a SCR is

  Both A and B.
 Directly proportional to supply voltage.
 Directly proportional to inductance in the circuit.
 Inversely proportional to supply voltage.

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Power Electronics
A GTO can be turned on by applying

 Positive source signal.
  Positive gate signal.
 None of these.
 Positive drain signal.

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Power Electronics
Snubber circuit is used with SCR

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

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