Drafting operation is defined as which action?

• A. Use of suction to move a liquid
• B. The use of positive pressure to move a liquid
• C. A device that siphons liquid from a container
• D. The use of suction to move a liquid via a siphon

Answer: (A)

Drafting operation is about drawing liquid by suction from a source into a pump or system. The key idea is using suction to lift and move the liquid, rather than pushing it with pressure or relying on a siphon’s gravity-driven flow. Positive pressure would push liquid forward, not pull it from the source. A siphon describes a device or setup that uses gravity to move liquid after priming, which is a different mechanism than the suction-based action defined by drafting. So the action of suction to move the liquid best captures what drafting entails.