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Power Electronics

Power Electronics
The UJT may be used as ___________.

A rectifier
Am amplifier
A sawtooth generator
None of these

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Power Electronics
Thermal voltage VT can be given by

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

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 2121.32 A.
 6000 A.
 4242.64 A.
 1500 A.

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Power Electronics
To meet high current demand we use SCRs in

  parallel connection.
 anti parallel connection.
 both B and C.
 series connection.

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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?

  111.9 ohm
 108 ohm
 115 ohm
 11.19 ohm

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Power Electronics
Snubber circuit is used with SCR

 in series.
 anti parallel.
  in parallel.
 either series or parallel.

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