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In a DC machine, rectification process is carried out in order to get unidirectional output (DC). This rectification process is carried out by ______________

(a) Half wave rectifier

(b) Full wave rectifier

(c) Mechanical rectification

(d) Centre tapped rectifier

I had been asked this question in a job interview.

My question is taken from Construction in portion DC Machines of DC Machines

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Right option is (c) Mechanical rectification

To elaborate: In a DC machine electronic rectification is not used. Instead they use mechanical rectification with the help of commutator-brush assembly.

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