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 ?

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

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

Power Electronics Dynamic equalizing circuit is used for

equal division of voltage across each thyristor in parallel.
equal division of voltage across each thyristor.
equal division of current through each thyristor in series.
equal division of current through each thyristor in parallel.

Power Electronics After peak point, the UJT operates in the ___________ region.

Cut-off
Saturation
None of these
Negative resistance

Power Electronics Snubber circuit is used with SCR

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

Power Electronics Which of the following is used in SCR to protect from high dV / dt?

Circuit breaker.
Equalizing circuit.
Fuse.
Snubber circuit.