Coefficient of discharge of circular orifice in a wall tank under constant head Date of Exam May 1994 Subject Hydraulics and Geotechnical Engineering Problem A 1.25 cm diameter orifice, in a vertical wall of a tank under a constant head of 5.5 m discharged 0.45 cubic meter in 9.5 minutes. Find the coefficient of discharge. A. 0.62 C. 0.58 B. 0.42 D. 0.60 Answer Key Click here to show or hide the answer key [ A ] Solution Click here to expand or collapse this section Theoretical discharge Qt=A√2gH Qt=14π(0.01252)√2(9.81)(5.5) Qt=0.001275 m3/s Actual discharge Qa=Volumetime Qa=0.459.5(60) Qa=0.000789 m3/s Coefficient of discharge C=QaQt C=0.0007890.001275 C=0.62 ← answer Category Hydraulics Orifice Coefficient of Discharge Theoretical discharge Actual Discharge Constant Head Discharge Coefficient Log in or register to post comments