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Power Electronics

Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

  low.
 infinity.
 high.
 moderate.

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Power Electronics
Power transistor are type of

 IGBTs.
  All of above.
 BJTs.
 MOSFETs.

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Power Electronics
When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ?

 CB.
  Fast acting current limiting device (FACL fuse).
 Voltage clamping device.
 Snubber circuit.

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Power Electronics
Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then

 Vc1 = Vc2 = Vc3 any value of Ig.
 Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
  Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
 Vc1 > Vc2 > Vc3 when Ig1= Ig2

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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 ?

 3.0 ohm
  0.3 ohm
 0.3 ohm
 0.03 ohm

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Power Electronics
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________

Is decreased
Remains the same
None of these
Is increased

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