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Calculate the flux produced by the DC shunt field winding using the following data: Ia=5 A, IL=11, R=2, N=4.

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Calculate the flux produced by the DC shunt field winding using the following data: Ia=5 A, IL=11, R=2, N=4.

(a) 14 Wb

(b) 12 Wb

(c) 17 Wb

(d) 18 Wb

I got this question during an online interview.

My question is from Countercurrent Braking of DC Shunt Motors topic in chapter Braking of DC Motors & Induction Motors of Electric Drives

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The correct answer is (b) 12 Wb

To explain: In DC shunt motor, field windings are connected in parallel with the armature circuit. IF=IL-Ia=11-5=6 A. F=NIF=R∅. IF∝∅. ∅=F÷R=12 wb.

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