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1. In the U.S., what percentage of the energy used to generate electricity is lost to...

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Mechanical Engineering

1. In the U.S., what percentage of the energy used to generateelectricity is lost to conversion efficiencies?
i. 20%
ii. 30%
iii. 40%
iv. 50%
v. 60%


2. What is wind turbine coefficient of performance?
i. The ratio of tip speed to incoming wind speed
ii. The ratio of AC to DC turbine power
iii. The ratio of power extracted by the turbine to the ratedturbine power
iv. The ratio of the power extracted by the turbine to the power inthe wind


3. What is the maximum wind turbine power that can be harvestedusing a wind turbine with a turbine radius = 0.2 m and wind speed =3 m/s, air density = 1.23 kg/m3?
i. 0.23 W
ii. 0.41 W
iii. 0.70 W
iv. 0.82 W
v. 1.23 W

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