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FAQs on Signal Definition & Its Classification - GATE Notes & Videos for Electrical Engineering - Electrical Engineering (EE)

1. What is the definition of a signal?
Ans. A signal is a variable quantity that carries some information. It can be defined as a function that conveys data or communicates a message.
2. What are the different types of signals?
Ans. Signals can be classified into various types based on their characteristics. The main types of signals are analog signals, digital signals, continuous-time signals, discrete-time signals, periodic signals, and non-periodic signals.
3. How can analog and digital signals be differentiated?
Ans. Analog signals are continuous and can take any value within a range, whereas digital signals are discrete and can only take specific values. Analog signals are represented by a continuous waveform, while digital signals are represented by a series of discrete values.
4. What are periodic signals and non-periodic signals?
Ans. Periodic signals repeat their pattern over a specific period of time, while non-periodic signals do not have a repetitive pattern. Periodic signals have a fundamental frequency and can be represented by a mathematical function, while non-periodic signals are typically random or unpredictable.
5. How are continuous-time signals and discrete-time signals different?
Ans. Continuous-time signals are defined and exist for all values of time within a given interval, while discrete-time signals are defined only at specific time instances. Continuous-time signals are represented by a continuous function, while discrete-time signals are represented by sequences of numbers.
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