An example of a primary collector is a cyclone.

• A. Electrostatic precipitator
• B. Wet scrubber
• C. Baghouse
• D. Cyclone

Answer: (D)

Cyclones rely on inertia to remove the largest dust particles from the airstream. The heavier particles can’t follow the gas as it swirls and spin downward to the walls, where they drop into the collection chamber. This makes the cyclone a first-stage, low-cost separator that targets big, coarse particles before the air moves on to more efficient, specialty collectors. For finer particles, higher-efficiency devices like fabric filters (baghouses), electrostatic precipitators, or wet scrubbers are used afterward to capture what the cyclone can’t. So the cyclone is the clear example of a primary collector.