Basic Qualification · B-004 Circuit components · B-004-003-005
What prevents the substitution of a PNP transistor with an NPN transistor?
- A The polarities are reversed
- B The current gain would be too low
- C The electrodes are labelled differently
- D The frequency response would be
Correct answer: A — The polarities are reversed. From the official ISED question bank, verified word for word.
Why
PNP and NPN transistors are built with opposite internal layers, meaning the battery connections must be flipped to make them work. 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.