In a D.C. generator:___________________?
Correct answer: C. external characteristic = magnetisation characteristic - ohmic drop - armature reaction
- A. external resistance = internal char-acteristic - armature reaction
- B. internal characteristic = magnetisation characteristic - ohmic drop
- C. external characteristic = magnetisation characteristic - ohmic drop - armature reaction
- D. magnetisation characteristic = external characteristic
Explanation
The external characteristic is below the magnetisation characteristic because armature reaction reduces generated emf and armature resistance causes an additional ohmic voltage drop. Therefore it is represented by the magnetisation characteristic minus both effects.
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