DC Generators
Magnetic field in a D.C. generator is produced by

Permanent magnets
Electromagnets
Both (A) and (B)
None of these

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DC Generators
Inter-pole flux should be sufficient to

Neutralize the armature reaction flux
Neutralize the commutating self induced e.m.f.
None of these
Neutralize both the armature reaction flux as well as commutating e.m.f. induced in the coil

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DC Generators
In a D.C. generator

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

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