DC Motors
When the armature of a D.C. motor rotates, e.m.f. induced is

Self-induced e.m.f.
Mutually induced e.m.f.
Back e.m.f.
None of these

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DC Motors
In a dc compound machine,

Both play equally dominant role
Series field winding plays dominant role
Either can play dominant role
Shunt field winding plays dominant role

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