Practice
Components & Circuits — Practice
The parts a station is built from — passives, semiconductors, power supplies and amplifier stages. Untimed topic practice with a full explanation after every question, so a wrong answer becomes a study note rather than a dead end.
Questions
12
Time limit
Untimed
Pass mark
60%
Before you start
- Untimed. The explanation appears as soon as you answer, because the point here is to learn rather than to score.
- Mark an answer as a guess and it enters your review queue even if it happened to be right.
- Every answer moves your ability estimate for that topic and updates your readiness score.
- Retake as often as you like.
Sample questions
A resistor is marked brown-black-red. What is its nominal value?
- 100 Ω
- 1,000 Ω
- 10,000 Ω
- 12 Ω
Why 1,000 Ω is right: Brown = 1, black = 0, and red as the multiplier means ×100. So 10 × 100 = 1,000 Ω, or 1 kΩ.
A gold tolerance band on a resistor indicates a tolerance of:
- ±1%
- ±2%
- ±5%
- ±10%
Why ±5% is right: Gold indicates ±5% and silver indicates ±10%. Brown and red bands are used for the tighter ±1% and ±2% grades.
What happens to the reactance of a capacitor as the applied frequency increases?
- It increases
- It decreases
- It stays constant
- It becomes purely resistive
Why It decreases is right: Capacitive reactance is Xc = 1 ÷ (2πfC), so it falls as frequency rises. A capacitor blocks DC but passes high-frequency AC readily.