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Which of the following best describes the function of a Printed Circuit Board (PCB) in a modern computing device?
It provides the primary user interface for inputting commands.
It acts as a mechanical support and electrical connection medium for electronic components.
It is a software-based tool used for simulating circuit designs.
It serves as the primary storage device for persistent data.
It acts as a mechanical support and electrical connection medium for electronic components.
A Printed Circuit Board (PCB) acts as a structural foundation that mechanically holds electronic components in place using adhesives or solder joints. Simultaneously, it provides electrical connectivity between these components through conductive pathways, typically made of copper, etched onto a non-conductive dielectric substrate.
IPC-2221 (Generic Standard on Printed Board Design)
A Printed Circuit Board (PCB) acts as a structural foundation that mechanically holds electronic components in place using adhesives or solder joints. Simultaneously, it provides electrical connectivity between these components through conductive pathways, typically made of copper, etched onto a non-conductive dielectric substrate.
R=╧БALтАЛ тАФ Formula for track resistance where ╧Б is copper resistivity, L is length, and A is cross-sectional area
Z0тАЛ=╧╡rтАЛ+1.41тАЛ87тАЛln(0.8w+t5.98hтАЛ) тАФ Characteristic impedance formula for microstrip lines
The PCB utilizes a laminate substrate (e.g., FR-4) for mechanical rigidity and insulation. Conductive copper tracks, designed during the layout phase, form the circuit interconnects. Components are mounted on the surface (SMT) or through holes (THT) and connected to these tracks via solder pads to facilitate signal and power distribution across the system.
PCBs eliminate point-to-point wiring, increasing reliability and reducing manufacturing errors.
Common substrate materials include FR-4, polyimide, and ceramic based on thermal requirements.
Multi-layer PCBs allow for increased component density by separating signal, power, and ground planes.
Compact size and reduced space requirements
Ease of mass production and automated assembly
High reliability and reduced maintenance costs
Difficult to repair once tracks are damaged
High initial design and prototyping costs
Susceptibility to thermal expansion stress
Consumer electronics (smartphones, laptops)
Industrial control systems
Medical devices and automotive ECUs
FR-4 is the most common industry-standard substrate, consisting of woven fiberglass cloth impregnated with epoxy resin.
Option A refers to peripherals like keyboards or touchscreens; Option C refers to ECAD/EDA software (e.g., Altium, KiCad); Option D refers to storage hardware like SSDs or HDDs.
B is correct тАФ It acts as a mechanical support and electrical connection medium for electronic components.
In competitive exams, remember that a PCB is hardware and a physical component carrier, whereas EDA tools (like SPICE or Cadence) are software used to design them.