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

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

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DC Generators
Lap winding is composed of

Any odd number of conductors
That even number which is exact multiple of poles + 2
That even number which is exact multiple of poles
Any even number of conductors

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