Topics Covered

Number systems and codes, Digital logic: Boolean algebra, De-Morgan's law, Logic gates and their
truth tables, canonical forms, combinational logic circuits, minimization techniques, Arithmetic and
data handling logic circuit, decoders and encoders. Multiplexers and Demultiplexers. Combinational
Circuit design, Flip-flops, race around problems, Counters: Asynchronous and Synchronous
counters and their applications. Synchronous and asynchronous logic design: state diagram, Mealy
and Moore machine. State minimization and assignments. Pulse mode logic. Fundamental mode
logic design.

EEE Short Questions and Answers (Digital Logic)

Fig : Basic Digital Logic Gates (Symbol)

1. Define AND Gate ?
ans : A logic gate that produces a HIGH output only when all of the inputs are HIGH.

2. What is an Inverter ?
ans : A logic circuit that inverts or complements its input.

3. What is a NOR gate ?
ans : A logic gate in which the output is LOW when one or more of the inputs are HIGH.

4. What is Timing Diagram ?
ans : A diagram of waveforms showing the proper timing relationship of all the waveforms.

5. What is XOR (Exclusive OR) gate ?
ans :  A logic gate that produces a HIGH output only when its two inputs are at opposite levels.

6. What is SPLD ?
ans : Simple programmable logic device; an array of AND Gates and OR Gates that can be programmed to achieve specified logic functions. Four types are PROM, PLA, PAL and GAL.