Advanced Qualification · A-001 Advanced theory · A-001-005-004
What is the Q of a parallel RLC circuit, if it is resonant at 14.225 MHz, L is 3.5 microhenrys and R is 10 kilohms?
- A 71.5
- B 31.9
- C 7.35
- D 0.0319
Correct answer: B — 31.9. From the official ISED question bank, verified word for word.
Why
The value 31.9 is correct because the quality factor, or Q, measures how sharply a circuit resonates by comparing the resistance to the reactance of the coil at that specific 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.