(i) What are the two kinds of emfs induced in the armature of a.c. commutator machines?
(ii) How commutation in single-phase series machines differs from those in d.c. machines?
(i) Give a scheme commonly employed for obtaining four speeds in a universal motor for a mixer.
(ii) Show that it is favorable to start a repulsion motor from its low impedance position.
please answer all four questions
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