Advanced Qualification · A-001 Advanced theory · A-001-005-002
What is the Q of a parallel RLC circuit, if it is resonant at 14.128 MHz, L is 4.7 microhenrys and R is 18 kilohms?
- A 4.31
- B 43.1
- C 13.3
- D 0.023
Correct answer: B — 43.1. From the official ISED question bank, verified word for word.
Why
The value 43.1 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.