(SEM IV) THEORY EXAMINATION 2021-22 DIGITAL ELECTRONICS

SECTION A — Short Descriptive Paragraph

Section A contains basic digital electronics questions such as binary subtraction, comparison of adders, combinational vs sequential circuits, shifting in registers, JK flip-flop behaviour, race conditions, TTL vs CMOS, and fan-in/fan-out. Each answer must be a small paragraph explaining the concept clearly.

Extra sample questions:
Explain half adder in a short paragraph.
Describe the purpose of flip-flops in sequential circuits.
Explain binary-to-decimal conversion in simple words.

SECTION B — Medium-Length Description

Section B contains descriptive questions that require one complete paragraph. These include Boolean simplification using K-map, multiplexer implementation, synchronous vs asynchronous counters, sequential circuits, ROM types, and designing counters. You must explain the working, logic, or design steps in connected sentences.

Extra sample questions:
Explain the working of a decoder in a descriptive paragraph.
Describe the concept of a ripple counter.
Explain how a 4:1 MUX can be used to implement logic functions.

SECTION C — Long Description Paragraph

Section C contains long theory or design-based questions such as Hamming code error detection, XOR design using NAND/NOR, full adder design, JK flip-flop race-around, RS flip-flop analysis, SR latch design, sequential circuit design from state diagram, and PLA/PAL implementation. Each answer needs one detailed paragraph explaining the full concept with steps.

Extra sample questions:
Explain the working of a JK flip-flop in a detailed paragraph.
Describe the procedure to design a full subtractor.
Explain how PLA implements multiple Boolean functions.