Networks Analysis and Synthesis - Engineering

Q1:

A resistance R, inductance L and capacitance C are in series. The source frequency is adjusted to be equal to resonant frequency. The lower half power frequency is ω1. Another resistance R is added in series with the circuit. The new lower half power frequency will be

A ω1

B less than ω1

C more than ω1

D either more than ω1 or less then ω1

ANS:C - more than ω1

As R increases, Q decreases, bandwidth = . Therefore, bandwidth increases. Hence lower half power frequency will be less than ωr.