Electrical Machines
DC machine is a

 convection machine.
 none of above are correct.
 both are correct.
 conduction machine.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 the armature connection must be reversed
 the field winding must be replaced
 the field winding connection must be reversed
 field winding must be excited by low voltage dc supply

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Which of the following represents the commutator pitch?

 Number of conductors spanned by one coil at the front end of the armature.
 Number of commutator segments between two successive coils.
 The distance between the staring of first coil and its next successive coil
 Number of conductors spanned by one coil at the back end of the armature.

ANSWER DOWNLOAD EXAMIANS APP