Electrical Machines
In a DC machine

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate with rise in terminal voltage.
 improve with fall of terminal voltage.
 improve with rise in terminal voltage.
 deteriorate with fall of terminal voltage.

ANSWER DOWNLOAD EXAMIANS APP