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Which of the following test is usually conducted to determine the efficiency of traction motors ?

(A) Field’s test (B) Swinburne’s test

(C) Hopkinson’s test (D) Retardation test.
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Which of the following test is usually conducted to determine the efficiency of traction

motors ?

(A) Field’s test (B) Swinburne’s test

(C) Hopkinson’s test (D) Retardation test.

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