The use of a cutout with an expulsion fuse will prevent all violent explosions and fires in transformers.

• A. It will prevent some fires
• B. False
• C. True
• D. It will worsen

Answer: (B)

Protective devices like a cutout with an expulsion fuse are designed to quickly interrupt fault current and isolate a faulty section, reducing the energy released and helping to prevent escalation. The expulsion action helps extinguish the arc by venting and ejecting fuse material, which further limits damage and lowers the chance of a fire spreading.

But this does not guarantee that violent explosions or fires will never occur. Faults can originate inside the transformer itself, or involve conditions where oil heating, pressure buildup, or rapid energy release overcome the protective action. In large oil-filled transformers, internal arcing or insulation failure can still lead to explosions or fires even after the fuse operates. So the statement is not accurate: while this protection reduces risk, it does not prevent all such events.