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External characteristic differ from internal characteristic in DC series motor by ______

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External characteristic differ from internal characteristic in DC series motor by ______

(a) Ia *(Ra + RSE)

(b) Ia *Ra

(c) Ia *RSE

(d) If *RSE

The question was posed to me in semester exam.

My query is from Characteristics of Separately Excited Generators topic in division DC Generator of DC Machines

1 Answer

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Best answer
The correct choice is (a) Ia *(Ra + RSE)

Explanation: In series DC generator series resistor RSE is added with armature circuit, thus total drop in terminal voltage from generated armature voltage is equal to Ia *(Ra + RSE). While drawing internal characteristics presence of armature resistance and series resistance is not taken into account.

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