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While carrying out Swinburne’s test at rated armature voltage motor will run at ____________

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While carrying out Swinburne’s test at rated armature voltage motor will run at ____________

(a) Speed equal to rated speed

(b) Speed greater than rated speed

(c) Speed less than rated speed

(d) Can run anywhere

I had been asked this question during a job interview.

The question is from Swinburne’s Test in portion Efficiency and Testing of DC Machines

1 Answer

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Right option is (b) Speed greater than rated speed

The explanation is: The motor is set to run on a rated speed while conducting Swinburne’s test by adjusting field current to rated value. When rated armature voltage is applied, motor runs with slightly greater speed than the rated one as some o the losses are not taken into account.

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