1 Answer

When the armature of a D.C. motor rotates, e.m.f. induced is back e.m.f.

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Description : The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is  (1) 1000V (2) 100V (3) 600V (4) 10,000V

Answer : The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is 1000V

Description : The counter e.m.f. of a d.c. motor?

Answer : The counter e.m.f. of a d.c. motor helps in energy conversion.

Answer : If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by Blv.

Description : The induced e.m.f. in the armature conductors of a d.c. motor is?

Answer : The induced e.m.f. in the armature conductors of a d.c. motor is sinusoidal.

Answer : The armature may burn if the back e.m.f. of a D.C. motor vanishes suddenly.

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