Q.

Coefficient of contraction is the ratio of

• AActual velocity of jet at vena contracta to the theoretical velocity
• BLoss of head in the orifice to the head of water available at the exit of the orifice
• CLoss of head in the orifice to the head of water available at the exit of the orifice
• DArea of jet at vena-contracta to the area of orifice