Practice question Calculate the friction loss in 400 ft of 3-inch hose flowing 300 gpm. 29 psi60 psi100 psi120 psi Answer: A — 29 psi The correct answer is shown above. Try the full quiz for additional practice. Practice more: NFPA D O Apparatus Practice Questions - NFPA 1002 Driver/Operator - Apparatus (Pumper) Certification Exam Exam →