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

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
None of these

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DC Generators
In a D.C. generator

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

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