Subtopic: Sources of power on the farm – human, animal, mechanical, electrical, wind, solar and biomass
Question Statement:
A horizontal-axis drag-type windmill (square blades) and a horizontal-axis lift-type windmill (airfoil blades) of the same rotor size are installed at 10 m height; average wind speed 25 km/h. Maximum power coefficients: drag type 0.148, lift type 0.593. If the maximum power extracted by the drag type is 5 kW, the corresponding power for the lift type, in kW, is:
Options:
(A) 8.43
(B) 12.63
(C) 18.03
(D) 20.03
Official Answer Key:
D
Step-by-Step Solution & Explanation
Power extracted ∝ power coefficient Cp (same rotor swept area and wind speed for both). P_lift/P_drag = Cp,lift/Cp,drag = 0.593/0.148 = 4.007. P_lift = 5 × 4.007 = 20.03 kW. Answer: D.
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