The coefficient of discharge (Cd) for a sharp-edged orifice is approximately:
Choose the correct answer
Cd = 1.0 (no loss)
Cd ≈ 0.62 for sharp-edged orifice (product of contraction and velocity coefficients)
Cd = 0.99
Cd = 0.1
Correct Answer
B. Cd ≈ 0.62 for sharp-edged orifice (product of contraction and velocity coefficients)
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Cd = Cc × Cv ≈ 0.64 × 0.98 ≈ 0.62 for sharp-edged circular orifice. Cc = contraction coefficient (actual area / orifice area) ≈ 0.64; Cv = velocity coefficient ≈ 0.97–0.99. Q = Cd × A × √(2gh). For well-rounded (bell-mouth) orifice: Cd ≈ 0.97–0.99. Lower Cd for sharper edge.
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