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d
Explanation: Francis and propeller turbines are totally submerged in water, the turbine
casing is full of water. As the water flows through the turbine blades, its pressure
changes. Also the discharging water creates negative pressure below the turbine
blades. Pelton turbines are fitted in open air and water Jet is forced into its blades by
nozzel so it’s inside pressure is equal to atmospheric pressure