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Which of the following empirical relations may be used to find out the air gap length of a large three-phase induction motor?
l𝑔 = 0.2 + 2 DL
𝑙𝑔 = 0.125 + 0.35𝐷 + 𝐿 + 0.015Va
𝑙𝑔 = 0.2 + 𝐷
𝑙𝑔 = 1.6 D − 0.25