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What is the formula for the turns per phase in the armature design?

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What is the formula for the turns per phase in the armature design?

(a) turns per phase = voltage per phase * parallel paths per phase / 4.44 * flux density * frequency * winding space factor

(b) turns per phase = voltage per phase / parallel paths per phase * 4.44 * flux density * frequency * winding space factor

(c) turns per phase = voltage per phase * parallel paths per phase * 4.44 * flux density * frequency * winding space factor

(d) turns per phase = voltage per phase * parallel paths per phase * 4.44 * flux density / frequency * winding space factor

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The above asked question is from Armature Design in section Design of Synchronous Machines of Design of Electrical Machines

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Correct choice is (a) turns per phase = voltage per phase * parallel paths per phase / 4.44 * flux density * frequency * winding space factor

The explanation: For obtaining the turns per phase, the voltage per phase is obtained along with the parallel paths per phase. Next the winding space factor is calculated and the substitution in the formula gives the turns per phase.

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