A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is
A. 0.46
B. 0.64
C. 0.78
D. 0.87
Answer: Option B
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Area of Orifice/ Area of Jet at Vena Contracta=32²/40²=0.64
Coefficient of contraction = Diameter of orifice/Diameter of Jet = 32/40 = 0.8.