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Efficiency calculated by Swinburne’s test is _____________

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Efficiency calculated by Swinburne’s test is _____________

(a) Exactly equal

(b) Over-estimated

(c) Under-estimated

(d) Depends on the manual errors

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This intriguing question originated from Swinburne’s Test topic in portion Efficiency and Testing of DC Machines

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Right option is (b) Over-estimated

To elaborate: The stray-load loss cannot be determined by this test and hence efficiency is over-estimated. Correction can be applied after assuming the stray-load loss to be half the no-load loss, which is done generally. Also, temperature may effect on resistance value which is not considered in this test.

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