How armature resistance effect is shown graphically?(a) By adding IaRa product horizontally with Rf line(b) By subtracting IaRa product vertically with Rf line(c) By addingIaRa product vertically with Rf line(d) By subtractingIaRa product horizontally with Rf lineThe question was posed to me in an interview for internship.Question is taken from Graphical Representation of External Characteristics topic in chapter DC Generator of DC Machines

How armature resistance effect is shown graphically?(a) By adding IaRa

1.	How armature resistance effect is shown graphically?(a) By adding IaRa product horizontally with Rf line(b) By subtracting IaRa product vertically with Rf line(c) By addingIaRa product vertically with Rf line(d) By subtractingIaRa product horizontally with Rf lineThe question was posed to me in an interview for internship.Question is taken from Graphical Representation of External Characteristics topic in chapter DC Generator of DC Machines
Answer» RIGHT choice is (c) By addingIaRa product vertically with Rf line Easiest explanation: For representing the voltage drop in armature RESISTANCE, we add product IaRa vertically with Rf line at MINIMUM 2 points and DRAW line parallel to Rf to get line with V + IaRa = CONSTANT.

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