Choose the correct option to find the location where the DC excitation is applied.

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Chapter 39, Problem 13SQ

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Choose the correct option to find the location where the DC excitation is applied.

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a. Explain the terms, coil span, coil pitch, short pitching and chording of coils.b. Equalizer rings are needed in lap wound dc machines not in wave wound explain the reason andthe use of equalizer rings with the help of an example.c. What are dummy coils?d. What is the purpose of using short-pitched coils in ac windings?

2) the armature windings of a 12-pole DC machine are composed of 72 coils with 10 windings, and the windings are 5the layered wave is yellowish. The Rotor speed is 1000 rpm and the flux value per pole is 25mWb.Resistance of Armature windings, commutation windings and compensation windings is 70mΩ, 10mΩ and5mω. (d) calculate the voltage value induced in the machine. (e) DC machine as a foreign (external) excitation generator with a rated current of 100A at full loadif it is started, what is the terminal voltage value? Calculate. (Enter the formulas that you use for calculations and enter the names of the corresponding parameters.)

2) the armature windings of a 12-pole DC machine are composed of 72 coils with 10 windings, and the windings are 5the layered wave is yellowish. The Rotor speed is 1000 rpm and the flux value per pole is 25mWb.Resistance of Armature windings, commutation windings and compensation windings is 70mΩ, 10mΩ and5mω. (a) the number of current paths in the machine, (b) the total number of conductors in Armature windings, (c) armature coefficient (constant)