Civil Engineering MCQAE Level Civil Engineering
The coefficient of contraction Cc for a small orifice is the ratio of:
Fluid MechanicsOrifice CoefficientMEDIUM
Choose the correct answer
A
Actual velocity to theoretical velocity
B
Area of vena contracta to area of orifice
C
Actual discharge to theoretical discharge
D
Actual head to theoretical head
Correct Answer
B. Area of vena contracta to area of orifice
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Cc = Area of vena contracta / Area of orifice. Typically Cc = 0.64 for sharp-edged orifice. Cd = Cc x Cv (coefficient of discharge = coefficient of contraction x coefficient of velocity).
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