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Power Electronics

Power Electronics
A diac is turned on by ___________.

A breakover voltage
None of these
Gate current
Gate voltage

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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

 90.
 70.
 60.
  80.

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Power Electronics
The function of snubber circuit connected across the SCR is to

 decrease di / dt.
 increase dV / dt.
 decrease dV / dt.
  suppress dV / dt.

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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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Power Electronics
The maximum di/dt in a SCR is

 Inversely proportional to supply voltage.
 Directly proportional to inductance in the circuit.
  Both A and B.
 Directly proportional to supply voltage.

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Power Electronics
The normal way to turn on a diac is by ___________.

Gate voltage
Gate current
None of these
Breakover voltage

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