1.

In a DC machine, let ϕ be the flux per pole, ωm be the armature speed in rad / s, Nc be the number of coil turns in the armature and P be the number of poles. What will be the average coil EMF in that machine?

A. \({E_a} = \dfrac{{\phi {\omega _m}{N_c}}}{P}\)
B. \({E_a} = \dfrac{{\phi {\omega _m}{N_c}P}}{{60}}\)
C. Ea = ϕωmNcP
D. \({E_a} = \dfrac{{\phi {\omega _m}{N_c}P}}{\pi }\)
Answer» E.


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