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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

  200 A.
 600 A.
 400 A.
 20 A.

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Power Electronics
A GTO can be turned on by applying

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

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Power Electronics
Why resistor is used in Snubber circuit ?

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

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

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

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Power Electronics
A diac is turned on by ___________.

A breakover voltage
Gate current
Gate voltage
None of these

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

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