Basic Qualification · B-004 Circuit components · B-004-001-011
What is the result of excessive positive feedback in an amplifier stage?
- A Frequency response is flattened
- B Voltage gain is reduced
- C Oscillations appear
- D Distortion is minimized
Correct answer: C — Oscillations appear. From the official ISED question bank, verified word for word.
Why
When an amplifier feeds too much of its output signal back into its input in the same phase, it creates a runaway loop where the signal keeps growing on its own without any new input. The full explanation — and one for every question — is in Pro.
Practise this section
The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.