Topic: Fluid Mechanics
A jet of water discharging from a 40 mm diameter orifice has minimum area corresponding to dia of 24.4 mm at its vena contracta. The coefficient of contraction is
- A. 0.46
- B. 0.61
- C. 0.78
- D. 0.87
Answer: B. 0.61
Explanation: According to the provided solution, the ratio of the diameters is evaluated directly as $24.4 / 40 = 0.61$, which matches the typical acceptable range for the coefficient of contraction (0.61 to 0.69) for an orifice meter.