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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

  0.32.
  0.45.
  0.67.
  0.27.

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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 above 1000 kHz
Frequencies less than 10 Hz

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

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

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Power Electronics
Dynamic equalising circuit is useful

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

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Power Electronics
A diac has ___________ terminals.

None of these
Three
Two
Four

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Power Electronics
Thermal voltage VT can be given by

 KT/q.
 (K2/q)(T + 1/T - 1).
 qT/K.
  Kq/T.

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