The armature torque of the D.C. shunt motor is proportional to____________?
Correct answer: B. armature current only
- A. field flux only
- B. armature current only
- C. both A. and B.
- D. none of the above
Explanation
Motor torque follows T ∝ ΦIa; in a shunt motor the field flux Φ is nearly constant, so torque is proportional mainly to armature current Ia. Thus option b is intended, whereas option c states the general motor relation without using the shunt-motor condition.
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