Following is the list of questions and answers on Analog communication. This questionnaire will help one pass the job interview for various Analog communication Skill based positions as well as useful during viva for engineering students.
Question - 1 : What is analog communication?
Answer - 1 : Analog communication is a method of transmitting data using continuous signals that vary in amplitude, frequency, or phase to convey information. It contrasts with digital communication, which uses discrete signals.
Question - 2 : Differentiate between analog and digital communication.
Answer - 2 : Analog communication uses continuous signals to transmit information, while digital communication uses discrete signals. Analog signals have infinite possible values, while digital signals have finite, discrete values (usually represented as 0s and 1s).
Question - 3 : Explain modulation and demodulation in analog communication.
Answer - 3 : Modulation is the process of imposing the information signal (modulating signal) onto a carrier signal. Demodulation is the process of extracting the original information signal from the modulated carrier signal at the receiver. The common modulation techniques are AM, FM and PM.
Question - 4 : What are the advantages of analog communication over digital communication?
Answer - 4 : Analog communication can transmit signals with infinite resolution, allowing for theoretically unlimited fidelity. It's often preferred in situations where high-fidelity reproduction of signals is necessary, such as in audio transmission.
Question - 5 : Discuss the different types of modulation techniques used in analog communication.
Answer - 5 : Common modulation techniques in analog communication include Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Modulation (PM). Each of these techniques varies one or more properties of the carrier signal in response to the modulating signal. Refer AM vs FM vs PM for more information.
Question - 6 : What is bandwidth in the context of analog communication?
Answer - 6 : Bandwidth refers to the range of frequencies over which an analog communication system can effectively transmit signals. It is typically defined as the difference between the upper and lower frequencies of the transmitted signal.
Question - 7 : How does noise affect analog communication systems?
Answer - 7 : Noise refers to unwanted signals that interfere with the transmitted signal, degrading the quality of communication. In analog systems, noise can introduce distortions and reduce signal clarity, leading to decreased fidelity and intelligibility.
Question - 8 : What is frequency spectrum in analog communication?
Answer - 8 : Frequency spectrum refers to the distribution of signal power across different frequencies in a transmitted signal. In analog communication, the frequency spectrum determines the bandwidth requirements and the range of frequencies that carry the modulated signal.
Question - 9 : Explain the concept of signal-to-noise ratio (SNR) in analog communication.
Answer - 9 : Signal-to-noise ratio (SNR) measures the ratio of the power of the desired signal to the power of background noise in an analog communication system. A higher SNR indicates a clearer, more reliable signal. Refer Signal_to_Noise_Ratio for more information.
Question - 10 : Discuss the applications of analog communication in modern technology.
Answer - 10 : Analog communication is still widely used in various applications, including radio broadcasting, television transmission, telephone systems, audio recording and playback, and medical imaging (such as MRI and ultrasound), where high-fidelity signal reproduction is essential.
These questions cover fundamental concepts and practical applications of analog communication, providing a comprehensive overview for an interview context.