Advanced Qualification · A-002 Advanced components and circuits · A-002-009-004
In a frequency multiplier circuit, the input signal is coupled to the base of a transistor through a capacitor. A radio frequency choke is connected between the base of the transistor and ground. The capacitor is:
- Apart of the input tuned circuit
- Ba by-pass for the circuit
- Cpart of the output tank circuit
- Da DC blocking capacitor
Correct answer: D — a DC blocking capacitor. From the official ISED question bank, verified word for word.
Why
The capacitor stops direct current from the power supply from reaching the signal source while letting the radio frequency signal pass through to the transistor base. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits is section A-002 of the Advanced exam: Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.
Drill A-002 — free, no account