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ANTONII [103]
2 years ago
14

Help me is it a b c or d?

Engineering
1 answer:
AleksandrR [38]2 years ago
4 0

b is the correct answer of this question

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The water in a large lake is to be used to generate electricity by the installation of a hydraulic turbine-generator at a locati
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Answer:

a) 0.76

b) 0.80

c) 1964 kW

Explanation:

GIVEN DATA:

\dot m = 5000 kg/s

Assume Mechanical energy at exist is negligible

A) Take lake bottom as reference, and then kinetic and potential energy  are taken as zero.

change in mechanical energy is givrn as

e_{in} - e_{out} = \frac{P}{\rho} - 0 = gh = 9.81 \times 50( \frac{1 kJ/kg}{1000 m^2/s^2}

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\Delta \dot E_{mec} = \dot m (e_{in} - e_{out}) = 5000 \times 0.491 = 2455 kW

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B) \eta -{gen} = \frac{\eta_{overall}}{\eta_{gen}} = \frac{0.76}{0.95} = 0.80

c) \dot W_{shaft} = \eta_{overall} \left | \Delta \dot E_{mec} \right | = 0.80(2455)

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3 years ago
What should you use to turn the water off and open the door?
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youn need to use your hands

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3 years ago
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