interpole fields only

series fields only

Junction of series and interpole fields

none of the above

stable

possible

regular

smooth

their rising voltage characteristics

unequal series field resistances

unequal speed regulation of their prime movers

their drooping voltage characteristics

the direction of magnetic flux

the direction of induced e.m.f.

the direction of motion of the conductor

the direction of induced current

Lenz's law

Faraday's law of electrolysis

Fleming's left hand rule

Faraday's law of electromagnetic induction