Pneumatically unloaded hopper cars typically carry which type of material?

Pneumatically unloaded hopper cars typically carry which type of material?

• A. Liquids
• B. Powdered materials
• C. Coal
• D. Gases

Answer: (B)

Pneumatic unloading relies on air moving through the car to transport dry bulk solids. This method works best with powders and fine granules that flow freely in air, so pneumatically unloaded hopper cars are typically used for powdered materials such as cement, flour, or plastic pellets. Liquids require pumps and sealed piping rather than air-based transfer, and gases aren’t carried in hopper cars at all. Coal is a larger bulk solid that is usually unloaded by gravity or mechanical means rather than by a pneumatic system.

Pneumatic unloading relies on air moving through the car to transport dry bulk solids. This method works best with powders and fine granules that flow freely in air, so pneumatically unloaded hopper cars are typically used for powdered materials such as cement, flour, or plastic pellets. Liquids require pumps and sealed piping rather than air-based transfer, and gases aren’t carried in hopper cars at all. Coal is a larger bulk solid that is usually unloaded by gravity or mechanical means rather than by a pneumatic system.