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Power Electronics

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

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

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Power Electronics
For series connected SCR’s dynamic equalising circuit consists of

 series R and diode with C across R.
 R and C in series but with diode across C.
  R and C in series but with diode across R.
 series R and diode with C across R.

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Power Electronics
Which of following is normally ON device

 IGBT.
 TRIAC.
 BJT.
  SIT.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

  Spread time.
 Rise time.
 Same for every case.
 Delay time.

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Power Electronics
Power electronics essentially deals with control of a.c. power at ___________.

50 Hz frequency
Frequencies above 20 kHz
Frequencies less than 10 Hz
Frequencies above 1000 kHz

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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

  0.27.
  0.67.
  0.45.
  0.32.

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