Hydraulics and Fluid Mechanics in ME
The undershot water wheels are those in which

The wheel runs entirely by the impulse of water
The wheel runs entirely by the weight of water
None of these
The wheel runs partly by the weight of water and partly by the impulse of water

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Hydraulics and Fluid Mechanics in ME
Coefficient of contraction is the ratio of

Loss of head in the orifice to the head of water available at the exit of the orifice
Loss of head in the orifice to the head of water available at the exit of the orifice
Area of jet at vena-contracta to the area of orifice
Actual velocity of jet at vena contracta to the theoretical velocity

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