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What type of gear is made use for the silent operation?

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What type of gear is made use for the silent operation?

(a) spur gears

(b) helical gears

(c) worm gears

(d) spur gears and worm gears

I have been asked this question during an interview.

Question is taken from Design Steps and Considerations topic in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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Correct choice is (b) helical gears

The explanation: There are three types of gears made use of in the gearing system of the PMDC motors. The helical gears is made use for the silent operation.

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