The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

• A.  2, 3, 6
• B.  1, 2, 5
• C.  3, 4, 5
• D.  2, 4, 5, 6

Answer: (B)