Electrical Machines
In a DC machine

 current and emf in armature are unidirectional
 current and emf at the terminals are alternating.
 emf in armature conductors and at the terminals is alternating.
 current and emf in armature are alternating.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Flashing of DC generator means

 neutralization of residual magnetism.
  increasing flux density by providing extra ampere-turns in field.
None of these
  creation of residual magnetism by a DC source.

ANSWER DOWNLOAD EXAMIANS APP