What is the hose coefficient for 2 inch hose?

• A. 0.5
• B. 2
• C. 1
• D. 3

Answer: (C)

In hose friction calculations used on Driver-Engineer exams, each hose size has a fixed coefficient that you use with the flow to determine friction loss. For a 2 inch hose, the standard table assigns a coefficient of 1. This baseline reflects how the hose resists flow compared to other sizes: smaller hoses have higher coefficients (more loss), larger hoses have lower ones (less loss). So a coefficient of 1 aligns with the commonly taught reference for 2 inch hose. The other numbers would imply different friction characteristics that don’t match the standard table for this size, so 1 is the appropriate value.