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Power Electronics

Power Electronics
A diac is turned on by ___________.

None of these
Gate voltage
A breakover voltage
Gate current

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Power Electronics
Snubber circuit is used with SCR

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

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Power Electronics
Which of the following is used in heat sink?

 Carbon.
 Silver.
  Aluminium.
 Iron.

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Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

 0.03 ohm
 0.3 ohm
 3.0 ohm
  0.3 ohm

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Power Electronics
Which semiconductor device acts like a diode and two transistor?

 UJT.
 Diac.
  Triac.
 SCR.

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Power Electronics
Leakage current flows through the thyristor in

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

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