Basic Qualification · B-004 Circuit components · B-004-003-006

A semiconductor device is labelled as a "general purpose audio NPN device." What is it?

1. A Thyristor
2. B Bipolar transistor
3. C Field-effect transistor
4. D Triac

Correct answer: B — Bipolar transistor. From the official ISED question bank, verified word for word.

Why

An NPN label describes a specific way of stacking materials inside a bipolar transistor, which is the standard component used to amplify audio signals. 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.

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