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Which of the following is not an advantage of the alternator?

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in Automobile Engineering by (80.5k points)
Which of the following is not an advantage of the alternator?

(a) Higher output

(b) Lower weight

(c) Less maintenance

(d) High efficiency

I have been asked this question in a job interview.

This question is from Charging System topic in portion Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

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The correct answer is (d) High efficiency

Best explanation: With a lightweight of the alternator, the efficiency of alternator increases. As the output current does not flow through the commutator and brushes, thus surface contamination is eliminated.

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