Step 1: Concept A cyclone separator uses centrifugal force to separate dust or particles from an air stream.
Step 2: Meaning Separation efficiency depends on the strength of the vortex created inside the chamber.
Step 3: Analysis Higher inlet velocity increases the tangential speed of the air, thereby increasing the centrifugal force acting on the particles. This forces more particles against the walls to be collected at the bottom.
Step 4: Conclusion Consequently, increasing the air inlet velocity directly improves the separation efficiency.
Final Answer: (A)