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Characteristics drawn at Ia = 0 is also called as ____________

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Characteristics drawn at Ia = 0 is also called as ____________

(a) Magnetization characteristics

(b) Non-magnetization characteristics

(c) Anti-magnetization characteristics

(d) Cannot be determined

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This key question is from No Load with On Load Characteristics of DC Generator topic in division DC Generator of DC Machines

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Correct choice is (a) Magnetization characteristics

The best explanation: With Ia = 0 (no load) at constant n, it is the presentation of Vt (=Ea) vs If. This is the most important characteristic as it reveals the nature of the magnetization of the machine. It is easy to determine as the generator is on no load and so only low rated prime mover will serve the purpose. It is commonly called the open–circuit/magnetization characteristic.

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