Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to applied voltage.
 None of above.
 Back emf is equal to half the applied voltage.
 Back emf is equal to zero.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The following statements relate to compensating winding (CW) and interpole winding (IW) of a dc machine : 1. CW neutralizes the armature reaction under a pole pitch 2. IW is connected in series with armature circuit 3. IW produces mmf in the commutating zone only 4. CWmmf is directed along the brush axis 5. Mmf produced by IW is equal to armature mmf From these, the correct statements are

 1, 3, 4, 5
 1, 2, 3, 4 and 5
 2, 3, 4
 2, 3, 4, 5

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

ANSWER DOWNLOAD EXAMIANS APP