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What is the frequency of a vibrating contact type regulator for DC generator?

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What is the frequency of a vibrating contact type regulator for DC generator?

(a) 20 per second

(b) 200 per second

(c) 200 per minute

(d) 20 per minute

This question was posed to me in homework.

This intriguing question originated from Charging System in section Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

1 Answer

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Right answer is (b) 200 per second

To explain: The frequency of a vibrating contact type regulator for DC generator is 200 per second. The main parts of the DC generator are frame, armature, and field coils. The parts of the armature are shaft, core, commutator and coil windings.

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