Advanced Qualification · A-001 Advanced theory · A-001-005-011
Why is a resistor often included in a parallel resonant circuit ?
- ATo decrease the Q and increase the bandwidth
- BTo increase the Q and decrease the skin effect
- CTo decrease the Q and increase the resonant frequency
- DTo 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 is section A-001 of the Advanced exam: Advanced theory: time constants, reactance, impedance, resonance, Q, and the mathematics behind tuned circuits.
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