Advanced Qualification · A-001 Advanced theory · A-001-005-011
Why is a resistor often included in a parallel resonant circuit ?
- A To decrease the Q and increase the bandwidth
- B To increase the Q and decrease the skin effect
- C To decrease the Q and increase the resonant frequency
- D To increase the Q and decrease bandwidth
Correct answer: A — To decrease the Q and increase the bandwidth. From the official ISED question bank, verified word for word.
Why
Adding a resistor to a parallel resonant circuit introduces energy loss, which lowers the circuit's quality factor, known as Q. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced theory: time constants, reactance, impedance, resonance, Q, and the mathematics behind tuned circuits.