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

A. 2
B. 3
C. 4
D. 6

A. short pitched
B. full pitched
C. either of these
D. None of them

A. open type winding
B. closed winding
C.  lap winding
D. wave winding

A.  roller bearings → large machines
B. ball bearings → small machines
C. neither 1 nor 2
D. Both a and b

A. copper graphite → low voltage high current density
B. carbon brush → normal ratings
C. electro graphite → large ratings
D. All of them

A. reduce eddy current loss
B. convert ac armature current in to dc
C. collecting of current without any sparkings
D. collecting of voltage

A. 13
B. 45
C. 36
D. 72

A. flux path completion
B. mechanical protection to the machine
C. produce working flux
D. Both A and B

A. DC generator
B. induction motor
C. DC motor
D. AC generator