ElectroHub

Viva practice

Exam-style questions generated from the component library — practice like it's the real viva.

Set up your round

Instant feedback after every question, with worked solutions.

Every question is multiple choice with 4 options. Components you've missed before show up more often, rounds rotate through the question bank so repeats stay rare, and "All categories" rounds mix in circuit-law calculations.

What the active / semiconductor quiz asks

Questions are generated from this site’s own reference pages for the 33 active / semiconductor parts below — diodes, transistors, ics — the brains. Because each one is built from a specific field of a specific part, a wrong answer always has somewhere to send you: the component page the question came from. Nothing here is a fixed question list, so no two runs are identical.

Question types in this category

Choosing33 parts
Failure modes33 parts
Function33 parts
Key specs33 parts
Markings33 parts
Package & pinout33 parts
Substitutes33 parts
Testing33 parts
Types & variants33 parts

Example questions

The real prompts, shown against the led (light-emitting diode).

  • How do you choose the right LED (light-emitting diode) for a job?
  • What are the common ways a LED (light-emitting diode) fails?
  • What does a LED (light-emitting diode) do?
  • Which key specs matter when choosing a LED (light-emitting diode)?
  • How do you read the value or markings on a LED (light-emitting diode)?

Parts you’ll be asked about

Every one has a reference page with specs, testing procedure and failure modes.

Active / Semiconductor referenceThe pages these questions are generated fromAll viva question categoriesFourteen categories across electrical and electronics