Constant of proportionality between back emf and armature speed of d.c. motor

Q.  Keeping the field excitation constant, the constant of proportionality between back emf and armature speed of d.c. motor is
- Published on 23 Oct 15

a. Twice of the proportionality constant between developed torque and armature current
b. Half of the proportionality constant between developed torque and armature current
c. Same as that of proportionality constant between developed torque and armature current
d. None of these

ANSWER: Same as that of proportionality constant between developed torque and armature current

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