---
title: "What is a PCB and its advantages"
subject: "Instrumentation II"
chapter: 8
key: "semester_5/instrumentation_ii:pcb-advantages"
source: https://www.bctengineer.com/q/semester_5/instrumentation_ii/pcb-advantages
site: BCT Engineering
---

# What is a PCB and its advantages

Instrumentation II · Chapter 8: Circuit Layout

- Asked in: 2075 Chaitra, 1+2 marks
- Video: [What are PCBs? || How do PCBs Work?](https://www.youtube.com/watch?v=Z2LgmIGE2nI) — Branch Education
- Answer checked by Claude Sonnet 5.5 on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_5/instrumentation_ii/pcb-advantages
- Whole chapter: https://www.bctengineer.com/md/semester_5/instrumentation_ii/chapter-8

## Question

What is PCB? Write down the advantages of PCB.

## Short answer

A PCB is an insulating board with copper tracks that support and connect components. Advantages are compactness, reliability, low mass-production cost, easy maintenance, good electrical performance with low noise, and mechanical strength.

## Answer

A **Printed Circuit Board (PCB)** is a flat board of insulating material (such as FR4 glass epoxy) with conducting copper tracks printed on one or both sides (or inner layers) that mechanically supports and electrically connects electronic components.

#### Advantages
1. Compact and light weight; high component density.
2. Reliable and repeatable: fixed connections, no wiring errors, fewer loose connections.
3. Low cost for mass production, with automated assembly and soldering.
4. Easy maintenance, testing and troubleshooting.
5. Good electrical performance: short connections, controlled impedance and lower noise and crosstalk.
6. Mechanically strong and vibration resistant.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. What is a PCB?
   A. A flat insulating board (e.g. FR4) with copper tracks that supports and connects components
   B. A type of IC
   C. A software tool
   D. A soldering method
   Answer: A. Copper tracks on insulating board both support and electrically connect components. (Key point: Definition)

2. Which is an advantage of PCBs?
   A. More wiring errors
   B. Reliable repeatable fixed connections with fewer loose connections
   C. Heavier assemblies
   D. Harder maintenance
   Answer: B. Fixed printed connections avoid wiring errors. (Key point: Advantage: reliability)

3. Why are PCBs cheap for mass production?
   A. Each is hand wired
   B. Automated assembly and soldering
   C. They need no components
   D. They cannot be tested
   Answer: B. Automation reduces cost per board. (Key point: Advantage: cost)