Calculate the value of equivalent inductance for series aiding of two coils whose self inductances are 5 H, 2 H, and mutual inductance value is 4 H.(a) 15 H(b) 12 H(c) 13 H(d) 11 HI got this question during an interview.Asked question is from Regenerative Braking of DC Shunt Motors topic in section Braking of DC Motors & Induction Motors of Electric Drives

Calculate the value of equivalent inductance for series aiding of two

1.	Calculate the value of equivalent inductance for series aiding of two coils whose self inductances are 5 H, 2 H, and mutual inductance value is 4 H.(a) 15 H(b) 12 H(c) 13 H(d) 11 HI got this question during an interview.Asked question is from Regenerative Braking of DC Shunt Motors topic in section Braking of DC Motors & Induction Motors of Electric Drives
Answer» RIGHT option is (a) 15 H The explanation is: The equivalent inductance for series AIDING of two coils is Leq=L1+L2+2M=5+2+8=15 H. The value of equivalent inductance increases DUE to mutually induced e.m.f in case of the magnetically coupled circuit.

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