Exam 3 Review.docx - Name(Third Exam Review 1 Water is being pumped up to a water tower 30 m above the horizontal pipe that is supplying the water at a

# Exam 3 Review.docx - Name(Third Exam Review 1 Water is...

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Name: (Third Exam Review) 10/21/2019 1. Water is being pumped up to a water tower 30 m above the horizontal pipe that is supplying the water at a rate of 50 kg/s. Assuming the pressure is the same in the supplying pipe and the water tower, what is the wattage of the pump needed to fill up the water tower if the pump is 40 percent efficient. 2. A hydraulic turbine has 50 m of head available at a flow rate of 1.3 m 3 /s, and its overall turbine-generator efficiency is 78 percent. Determine the electric power output of this turbine. 3. Water is pumped from a lower reservoir to a higher reservoir by a pump that provides 23 kW of useful mechanical power to the water. The free surface of the upper reservoir is 57 m higher than the surface of the lower reservoir. If the flow rate of water is measured to be 0.03 m 3 /s, determine the irreversible head loss of the system and the lost mechanical power during this process. 1
Name: (Third Exam Review) 10/21/2019 4. In a hydroelectric power plant, water enters the turbine nozzles at 800 kPa absolute with a low velocity. If the nozzle outlets are exposed to atmospheric pressure of 100 kPa, determine the maximum velocity to which water can be accelerated by the nozzles before striking the turbine blades.

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