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Power Electronics

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

  0.27.
  0.32.
  0.45.
  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 ?

 0.03 ohm
 0.3 ohm
 3.0 ohm
  0.3 ohm

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Power Electronics
Which of following is normally ON device

 IGBT.
 TRIAC.
 BJT.
  SIT.

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Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

 P1.
 N2.
 P2.
  N1.

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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

  0.004 A.
 0.002 A.
 0.01 A.
 0.009 A.

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Power Electronics
For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?

 108 ohm
 11.19 ohm
 115 ohm
  111.9 ohm

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