What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta ?
Correct answer: A. 0.64
- A. 0.64
- B. 1.65
- C. 0.32
- D. 0.94
Explanation
The coefficient of contraction is the vena-contracta area divided by the orifice area: Cc = (40/50)^2 = 0.64. Using diameters directly would incorrectly give 0.8 rather than an area ratio.
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