1. For building up of voltage in a d.c shunt generator,     (A) Field circuit resistance should be greater than a critical value.     (B) Field circuit resistance, Rf should → 0.     (C) Field circuit resistance should be less than a critical value.     (D) Field circuit resistance, Rf should → ∞.

Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
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Chapter1: Introduction
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1. For building up of voltage in a d.c shunt generator,
    (A) Field circuit resistance should be greater than a critical value.
    (B) Field circuit resistance, Rf should → 0.
    (C) Field circuit resistance should be less than a critical value.
    (D) Field circuit resistance, Rf should → ∞.

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