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______ test is used for determining the efficiency of a traction motor.

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______ test is used for determining the efficiency of a traction motor.

(a) Field

(b) Retardation

(c) Hopkinson

(d) Swineburne’s

This question was addressed to me in examination.

The query is from Efficiency and Testing of DC Machines topic in chapter DC Machines of Electrical Machines

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The correct option is (a) Field

For explanation I would say: Field test is used for finding efficiency of a traction motor.

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