Which components are associated with automatic head-of-material control?

• A. Hopper Conveyors, Flow Gates, Augers.
• B. Screed Heaters, Nozzles, Mixers.
• C. Dump Trucks, Pavers, Rollers.
• D. Front Axles, Rear Axles, Tires.

Answer: (A)

Head-of-material control is about managing how much asphalt enters the paving machine so the mat remains uniform. The hardware that makes this automatic control possible are the parts that handle and regulate the flow from the hopper into the paver: hopper conveyors move material toward the flow gates, flow gates control the rate at which material can pass, and augers meter and feed that material into the next stage. Together, these components set and maintain a consistent head of material, enabling automatic adjustments to keep the paving process steady.

Screed heaters, nozzles, and mixers relate to heating and distributing asphalt at the pave interface, not to controlling the material flow into the machine. Dump trucks, pavers, and rollers are equipment used in the operation, but they’re not the control hardware for head-of-material. Front axles, rear axles, and tires are vehicle components and unrelated to HOM control.