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Power Electronics

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

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

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Power Electronics
Leakage current flows through the thyristor in

 forward conduction mode.
 forward blocking mode.
  both forward and reverse blocking mode.
 reverse blocking mode.

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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

 70.
  80.
 60.
 90.

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Power Electronics
Thermal voltage VT can be given by

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

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

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

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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
  111.9 ohm
 115 ohm
 11.19 ohm

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