Discussion
Statement I: A thinned array keeps the beamwidth of the full array.
Statement II: A thinned array keeps the gain of the full array.
In the light of the above statements, choose the correct answer.
Answer: D
The first is correct because beamwidth depends on the overall aperture, which thinning does not change. The second is wrong: gain depends on how much power is radiated coherently into the beam, and that falls with the element count. The pair separates two properties that usually rise together and so are easily confused. Thinning is worth doing precisely when resolution matters more than sensitivity, as in some radio astronomy and direction finding applications.
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