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

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

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DC Generators
In a D.C. generator

External characteristic = magnetization characteristic ohmic drop armature reaction
Internal characteristic = magnetization characteristic ohmic drop
External resistance = internal characteristic armature reaction
Magnetization characteristic = external characteristic

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