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

 600 A.
  200 A.
 400 A.
 20 A.

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Power Electronics
Why resistor is used in Snubber circuit ?

  To minimize the discharging current.
 All of these.
 To minimize the loss .
 To minimize the charging current.

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Power Electronics
How can we protect SCR from thermal conditions ?

 Using equalizing circuit.
 Using CB and fuse.
  Using heat sink.
 Use of snubber circuit.

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Power Electronics
A power semiconductor may undergo damage due to

  High di/dt.
 High dv/dt.
 Low di/dt.
 Low dv/dt.

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Power Electronics
A GTO can be turned on by applying

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

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