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.