Basic Qualification · B-004 Circuit components · B-004-005-005
Which semiconductor device has characteristics most similar to a triode vacuum tube?
- A Bipolar transistor
- B Field-effect transistor
- C Triac
- D Thyristor
Correct answer: B — Field-effect transistor. From the official ISED question bank, verified word for word.
Why
A Field-effect transistor controls current using a voltage applied to its gate, much like a triode vacuum tube uses a voltage on its grid to steer the flow of electrons. 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.