First Semester · BCA 103

Digital Logic Notes

A dedicated BCA World study page for this subject, aligned to the TU BCA 2025 curriculum units.

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BCA 103 · Digital Logic

3 credits · 5 curriculum units · First Semester

How to study this subject

For each unit, learn the definition, understand the process, practise one example, and finish by explaining the concept in your own words. Use the model questions after completing the unit notes.

Unit-by-unit notes

Boolean algebra, logic gates, and binary arithmetic

Revise the definition, components, workflow, common examples, and practical use of boolean algebra, logic gates, and binary arithmetic. Relate it to a small problem or case study from Digital Logic.

Define the key terms and identify the main components.
Draw or describe the workflow, architecture, formula, or process where relevant.
Connect the idea to a practical BCA example and revise common advantages or limitations.

Combinational circuits: adders, multiplexers, decoders, and encoders

Revise the definition, components, workflow, common examples, and practical use of combinational circuits: adders, multiplexers, decoders, and encoders. Relate it to a small problem or case study from Digital Logic.

Define the key terms and identify the main components.
Draw or describe the workflow, architecture, formula, or process where relevant.
Connect the idea to a practical BCA example and revise common advantages or limitations.

Sequential circuits: latches, flip-flops, registers, and counters

Revise the definition, components, workflow, common examples, and practical use of sequential circuits: latches, flip-flops, registers, and counters. Relate it to a small problem or case study from Digital Logic.

Define the key terms and identify the main components.
Draw or describe the workflow, architecture, formula, or process where relevant.
Connect the idea to a practical BCA example and revise common advantages or limitations.

Data conversion, memory devices, and programmable logic

Revise the definition, components, workflow, common examples, and practical use of data conversion, memory devices, and programmable logic. Relate it to a small problem or case study from Digital Logic.

Define the key terms and identify the main components.
Draw or describe the workflow, architecture, formula, or process where relevant.
Connect the idea to a practical BCA example and revise common advantages or limitations.

Digital computer organization and circuit troubleshooting

Revise the definition, components, workflow, common examples, and practical use of digital computer organization and circuit troubleshooting. Relate it to a small problem or case study from Digital Logic.

Define the key terms and identify the main components.
Draw or describe the workflow, architecture, formula, or process where relevant.
Connect the idea to a practical BCA example and revise common advantages or limitations.

Model questions for BCA 103

Short answerDefine boolean algebra, logic gates, and binary arithmetic and mention two important uses.

Define boolean algebra, logic gates, and binary arithmetic and mention two important uses. Answer using a definition, structured explanation, relevant example, and conclusion.

Long answerExplain combinational circuits: adders, multiplexers, decoders, and encoders with a suitable diagram, example, or step-by-step method.

Explain combinational circuits: adders, multiplexers, decoders, and encoders with a suitable diagram, example, or step-by-step method. Answer using a definition, structured explanation, relevant example, and conclusion.

Practical / applicationApply sequential circuits: latches, flip-flops, registers, and counters to solve a small Digital Logic problem. State your assumptions and conclusion.

Apply sequential circuits: latches, flip-flops, registers, and counters to solve a small Digital Logic problem. State your assumptions and conclusion. Answer using a definition, structured explanation, relevant example, and conclusion.