Discussion
The local hot spot formation in the cross-section of the SCR is avoided by :
Answer: B
Hot spots are avoided by applying gate current nearer to the maximum gate current.
A hot spot forms when the SCR turns on over only a small area near the gate and the anode current crowds into it. A strong gate drive, close to the rated maximum gate current, turns on a larger area of the cathode at once and makes conduction spread faster across the whole cross-section, so the current density stays low.
Reducing the junction temperature and mounting on a heat sink deal with the average heating of the whole device, not with local current crowding at turn-on. Using only resistive loads does not limit the rate of rise of current.
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