DC Generators
The overall efficiency of a dc generator is maximum when its variable loss is equal to

Iron loss
Stray loss
Mechanical loss
Constant loss

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DC Generators
While applying Fleming's right-hand rule to and the direction of induced e.m.f., the thumb points towards

Direction of motion of the conductor if forefinger points in the direction of generated e.m.f.
Direction of motion of conductor, if forefinger points along the lines of flux
Direction of induced e.m.f.
Direction of flux

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