# Signals And Systems Interview Questions And Answers Pdf

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*By Practicing these interview questions, you can easily crack any Competitive Exams interview. Fully solved examples with detailed answer description. A system is represented mathematically as an operator which maps its input to its output, whereas signal is a physical quantity that varies with time, space or any other independent variable.*

- Signals and Systems Interview Questions and Answers
- Control System Interview Questions
- Signal and Systems Interview Questions and Answers

## Signals and Systems Interview Questions and Answers

Answer: A function of one or more independent variables which contain some information is called signal. A system is a set of elements or functional blocks that are connected together and produces an output in response to an input signal. Answer : A signal is what which contains information while wave does not contain any information.

Answer: A deterministic signal can be completely represented by mathematical equation at any time whereas a signal which cannot be represented by any mathematical equation is called random signal. What will be the signal in the frequency domain when a signal is discrete and periodic in time domain? Answer: Since periodicity in one domain reveals discrete in other domain, so if the signal is discrete and periodic in one domain then it is periodic nad discrete in other domain.

Answer: When amplitude of CT signal varies continuously, it is called analog signal. In other words amplitude and time both are continuous for analog signal. When amplitude of DT signal takes only finite values, it is called digital signal. Answer: A signal is said to be even signal if inversion of time axis does not change the amplitude. A signal is said to be odd signal if inversion of time axis also inverts amplitude of the signal.

Answer: Even or odd symmetry of the signal have specific harmony or frequency contents and this even and odd symmetry property is used in designing of filters. Can you able to reconstruct the original signal from sampled signal if it has been sampled at Nyquist rate?

Answer: No original signal cannot be reconstructed because in order to reconstruct the original signal from sampled signal when it is sampled at Nyquist rate, an ideal low pass filter is required which is impossible in real life to construct. What is the difference between power signal and energy signal in terms of energy and power? Answer: Energy of the power signal is infinite whereas power of the energy signal is zero. Answer: Unit impulse or unit sample functions are used to determine impulse response of the system.

Answer: The ramp function indicates linear relationship. It also indicates constant current charging of the capacitor. Answer: No, since quantizer is a non invertible system so we cannot construct original signal from quantized signal. Answer : Amplitude is a vector quantity having both value and direction whereas magnitude is a scalar quantity having only value but not the direction.

What are the limitations of Fourier transform and use of Laplace transform? Can we interchange the sampling and quantization operations, means instead of sampling the signal first and then quantized, can we do quantization first and then sampling? Answer: Yes we can interchange the sampling and quantization operations but the drawback is that it results in increased quantization noise.

Answer: When z-transform is evaluated on unit circle, then it becomes Fourier transform or in other words we can say that DTFT is a special case of z-transform on unit circle.

Answer: In DTFT the discrete signal is assumed to be aperiodic so the frequency domain signal is periodic and continuous whereas in DFT, the discrete signal is assumed to be periodic so frequency domain signal is periodic and discrete.

Answer: Gibbs phenomenon says that whenever there is abrupt discontinuity in the signal which is being sampled, the reconstructed signal will always have high frequency oscillations and as the number of samples increases the oscillations compress towards discontinuity but their maximum value remains the same.

Answer: A system is said to be invertible if there is unique output for every unique input. Answer: In convolution one of the two signals is folded and shifted while in correlation none of the signal is folded but one signal is shifted to right or left. Answer: When we calculate correlation function of the signal with itself, then it is called autocorrelation. Answer: One of the important characteristics of unit impulse is that very general signals can be represented as linear combination of delayed impulses.

Answer: It states that the power of the signal is equal to the sum of the square of the magnitudes of various harmonics present in the spectrum. Answer: By Fourier Transform we can represent the signal from time domain to frequency domain, thus we can find the various frequency components contained in the given signal. Helping us to find the total bandwidth required for the transmission of the given signal. Why for signal analysis we use only sinusoidal waves and not other signals?

Answer: sinusoidal fidelity is an important characteristic of linear system. If input to a linear system is a sine wave, the output will also be a sine wave at exactly the same frequency. Only the amplitude and phase can be different. Answer: Due to Aliasing high frequency contents are recovered at low frequency so both high frequency and low frequency contents are lost. Answer: Two vectors are said to be orthogonal if their product is zero.

Example, Trignometric and exponential functions. Answer: A linear system is a system that possesses the property of superposition, i. Answer: A passive filter is a kind of electronic filter that is made only from passive elements — in contrast to an active filter, it does not require an external power source beyond the signal.

An active filter is a type of analog electronic filter, distinguished by the use of one or more active components and require an external power source. Is it possible to design a filter which can give good results both in time domain and frequency domain? Answer: Digital filters have the following advantages compared to analog filters:.

Answer: If the system has finite duration impulse response then the system is said to be finite impulse response FIR system. Answer: If the system has infinite duration impulse response then the system is said to be infinite impulse response IIR system. Answer: Fourier series is the representation of a function f t by the linear combination of elements of a closed set of infinite mutually orthogonal functions. Answer: If the system is having even symmetry around some frequency other than zero then the filter is said to have linear phase.

Answer: Yes linear phase can be obtained by bidirectional filtering at the expense of double the execution time and program complexity.

## Control System Interview Questions

Answer: A function of one or more independent variables which contain some information is called signal. A system is a set of elements or functional blocks that are connected together and produces an output in response to an input signal. Answer : A signal is what which contains information while wave does not contain any information. Answer: A deterministic signal can be completely represented by mathematical equation at any time whereas a signal which cannot be represented by any mathematical equation is called random signal. What will be the signal in the frequency domain when a signal is discrete and periodic in time domain? Answer: Since periodicity in one domain reveals discrete in other domain, so if the signal is discrete and periodic in one domain then it is periodic nad discrete in other domain.

What is a signal and system? How can you differentiate signal and wave? What is the difference between deterministic and random signals? What will be the signal in the frequency domain when a signal is discrete and periodic in time domain? What are analog and digital signals? What are even and odd signals?

## Signal and Systems Interview Questions and Answers

A list of top frequently asked Control System interview questions and answers are given below. When the number of elements connected performs a specific function then the group of elements is said to constitute a system or interconnection of various components for a specific task is called system. Example: Automobile. Any set of mechanical or electronic devices that manages, regulates or commands the behavior of the system using control loop is called the Control System. It can range from a small controlling device to a large industrial controlling device which is used for controlling processes or machines.

What is meant by step response of the DT system? The output of the system y n is obtained for the unit step input u n then it is said to be step response of the system. Define Transfer function of the DT system.

Solved examples with detailed answer description, explanation are given and it would be easy to understand. Here you can find objective type Electronics and Communication Engineering Signals and Systems questions and answers for interview and entrance examination. Multiple choice and true or false type questions are also provided. You can easily solve all kind of Electronics and Communication Engineering questions based on Signals and Systems by practicing the objective type exercises given below, also get shortcut methods to solve Electronics and Communication Engineering Signals and Systems problems.

*What we have to do, if the spectrum of a discrete signal is to be expanded?*

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