Answer: B - The wheel runs entirely by the impulse of water
The undershot water wheels are those in which the wheel runs entirely by the impulse of water.
A water wheel is a device used, frequently in a watermill, to transform the energy of flowing or falling water into usable types of power. A water wheel is made out of a wheel with several buckets or blades positioned on the outer rim to create the driving car. The horizontal waterwheel, the undershot vertical waterwheel, and the overshot vertical waterwheel are the three different types of waterwheels.
An undershot wheel is a water wheel with a horizontal axle that is positioned vertically and rotates when water from a low weir hits the wheel's bottom quarter. The water movement generates the majority of the energy gain, whereas the head contributes only a small amount. So it is clear that The undershot water wheels are those in which the impulse of water drives the wheel.
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