Question

What will be the effect if we loading down a tuned-circuit amplifier?

(a) it will raise the Q factor of tuned circuit

(b) it will lower the Q factor of tuned circuit

(c) it will multiply the Q factor by a constant

(d) it will have no effect on Q factor

I had been asked this question during an internship interview.

My enquiry is from Multitone Wideband FM topic in portion Angle Modulation of Analog Communications

Answer 1

Right answer is (b) it will lower the Q factor of tuned circuit

The explanation is: Loading down a tuned circuit will automatically lower the Q factor of any circuit. Q factor characterizes resonator’s bandwidth relative to its center frequency. It is a measure of the performance of the resonant circuit.