DC Generators
Open circuited armature coil of a D.C. machine is

Both of the listed here
Identified by the scarring of the commutator segment to which open circuited coil is connected
None of these
Indicated by a spark completely around the commutator

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

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