In a Dust Explosion the 1st explosion is followed by

• A. a bigger one
• B. a smaller one
• C. the same size
• D. a delayed explosion

Answer: (A)

In a dust explosion, the initial blast often unsettles and suspends settled dust, creating a much larger dust-air cloud. When that bigger cloud ignites, it burns with more fuel, more oxygen, and turbulent flow, driving a more powerful explosion than the first one. That combination makes the secondary explosion larger rather than smaller or the same size. While a delayed ignition can occur in some cases, the common pattern that exam scenarios test is a bigger secondary explosion.