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Power Electronics

Power Electronics
If the anode current is 800 A, then the amount of current required to turn off the GTO is about

 20 A.
 600 A.
 400 A.
  200 A.

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Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.32.
  0.45.
  0.27.
  0.67.

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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 ?

 3.0 ohm
 0.3 ohm
 0.03 ohm
  0.3 ohm

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Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

  0.25.
 0.2.
 0.7.
 0.75.

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Power Electronics
IGBT combines the advantages of

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

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Power Electronics
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

 30° to 180°.
 30° to 150°.
 60° to 120°.
 60° to 180°.

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