Advanced Qualification · A-001 Advanced theory · A-001-005-001
What is the Q of a parallel RLC circuit, if it is resonant at 14.128 MHz, L is 2.7 microhenrys and R is 18 kilohms?
- A 7.51
- B 0.013
- C 71.5
- D 75.1
Correct answer: D — 75.1. From the official ISED question bank, verified word for word.
Why
The value 75.1 is correct because the quality factor, or Q, for a parallel circuit measures how sharply it resonates by comparing the resistance to the reactance of the coil at the resonant frequency. 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.