3. Pelton wheel runner produces 20 MW under a head of 450 m when running at a speed of 600 rpm. If the mean runner diameter is 10 times the diameter of jet, determine the number of jets, diameter of each jet, diameter of wheel, and discharge. The overall efficiency, coefficient of velocity, and speed ratio are 0.85, 0.98, and 0.47, respectively.

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Q: Thank you . But where did you get 12 from ?

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A:

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.