Signals and Systems Question & AnswersJune 5, 2021 By WatElectronics This article lists 100+ Signals and Systems MCQs for engineering students. All the Signals and Systems Questions & Answers given below includes solution and link wherever possible to the relevant topic.A signal is a time-variant and a physical phenomenon. The main intention of the signal is to convey information like the human voice, the voltage on telephone wires, electrical signals, etc. Noise is also a signal but it carries unwanted information. A system is a device or group of devices that do operations on signals. The system may have one or more inputs and outputs. The inputs of the system are always excitation and the outputs of the system are always the response. If two or more inputs and two or more outputs are given to the system then that system is called the MIMO system.In three ways the discrete-time signals are represented are functional, tabular method of representation, and sequence representation. In a memory-less system, the value of the present output depends on the present input. The dynamic system consists of delay elements, differentiation, integration, in their equation. In a memory system, the value of the present output depends on past/future input. The step function, impulse function, and ramp function are the elementary signals. The speech signal is the example of a one-dimensional signal, image is an example of the multi-dimensional signal. The system is said to be linear if it satisfies the scaling and additivity properties. If distinct inputs lead to distinct outputs then the system is said to be invertible.1). The impulse function is denoted by _______ u(t) δ(t) u(t) or δ(t) None of the above HintThe impulse function denoted by δ(t)2). The impulse function is _______ when t=0 One Zero Infinity None of the above HintThe impulse function is one when t=03). Whenever the amplitude of step function is equivalent to one then that is ______ signal Unit Step Impulse None of the above HintWhenever the amplitude of step function is equivalent to one then that is unit signal4). When t≥0, the unit signal amplitude must be ________ One Zero Infinity None of the above HintWhen t≥0, the unit signal amplitude must be one5). When t<0, the unit signal amplitude must be ________ One Zero Infinity None of the above HintWhen t<0, the unit signal amplitude must be zero6). The discrete-time always indicated with n True False HintYes, the discrete-time always indicated with t, for example u(n)7). Whenever the amplitude of step function is more than one then that is called as ___________ signal Unit Step Impulse None of the above HintWhenever the amplitude of step function is more than one then that is called a step signal8). The continuous-time always indicated with t True False HintYes, the continuous-time always indicated with t, for example u(t)9). How many inputs does the system have? Only one Only two One or more inputs None of the above HintA system has one or more than one inputs10). Signal is a _________ Time variant It is a physical phenomenon Conveys information All of the above HintA signal is a time-variant, and it is a physical phenomenon, and its main intention is to convey information11). ________ are the examples of signal Human voice Electrical signals Voltage on telephone wires All of the above HintHuman voice, electrical signals, the voltage on telephone wires, etc are examples of signal12). The inputs of the system are called _____ Excitation Response Both a and b None of the above HintThe inputs of the system are always excitation13). In a ______ signal, we can define the value of the signal at any instant of time? Continuous Discrete Both a and b None of the above HintIn a continuous signal, we can define the value of the signal at any instant in time14). In a _________ signal, we can’t define the value of the signal at any instant of time? Continuous Discrete Both a and b None of the above HintIn a discrete signal, we can’t define the value of the signal at any instant in time15). Time scaling won’t work for the ____________ function Unit step Impulse Both a and b None of the above HintThe time scaling won’t work for the unit step function16). The impulse function is _______ when t≠0 One Zero Infinity None of the above HintThe impulse function is zero when t≠017). When n=k, δ(n-k) is _______ One Zero Infinity None of the above HintWhen n=k, δ(n-k) is one18). When n≠k, δ(n-k) is _______ One Zero Infinity None of the above HintWhen n≠k, δ(n-k) is zero19). The signum function denoted with ______ s(t), s(n) sgn(t), sgn(n) Both a and b None of the above HintThe signum function denoted with sgn(t), sgn(n)20). How many outputs does the system have? Only one Only two One or more outputs None of the above HintA system has one or more outputs 21). The outputs of the system are called ________ Excitation Response Both a and b None of the above HintThe outputs of the system is always the response22). A __________ is an example of the system Communication system Oscilloscopes Modem All of the above HintA communication system, oscilloscopes, modems, etc are examples of the system23). The standard form of LTI is ___________ Time-Invariant System Linear Non-linear Either linear or non-linear None of the above HintThe standard form of LTI is Linear Time-Invariant System24). The unit step signal is denoted with _______ u(t) u(n) u(t) or u(n) None of the above HintThe unit step signal is denoted with u(t) or u(n)25). ________ are the properties of impulse function δ(n)-u(n)-u(n-1) f(t) δ(t)=f(0) δ(-t)= δ(t) All of the above Hintδ(n)-u(n)-u(n-1), f(t) δ(t)=f(0), δ(-t)= δ(t) are the properties of impulse functionSignals and Systems MCQs with Hints26). The sgn(t) is equal to one when ______ t>o t<0 t=0 None of the above HintThe sgn(t) is equal to one when t>o27). The relation between u(t) and sgn() is _______ sgn(t)=u(t)-1 sgn(t)=2u(t)-1 sgn(t)=2u(t)+1 None of the above HintThe relation between u(t) and sgn() is sgn(t)=2u(t)-128). The unit ramp signal denoted by ________ u(t) sgn(t) r(t) or r(n) None of the above HintThe unit ramp signal denoted by r(t) or r(n)29). The r(t)=t when __________ t<0 t=0 t≥0 None of the above HintThe r(t)=t when t≥030). The r(t)=0 when __________ t<0 t=0 t≥0 None of the above HintThe r(t)=0 when t<031). The unit parabolic signal is zero when _________ t<0 t=0 t≥0 None of the above HintThe unit parabolic signal is zero when t<032). x(t)=A rect (t/T) is a representation of ________ Rectangular signal Unit signal Ramp signal None of the above Hintx(t)=A rect (t/T) is a representation of a rectangular signal33). The sgn(t) is equal to zero when ________ t<0 b)c) d) t=0 t≥0 None of the above HintThe sgn(t) is equal to zero when t=034). The sinc function denoted with _________ sinc(λ) sinc(δ) sinc(π) sinc(2λ) HintThe sinc function denoted with sinc(λ)35). The sampling function denoted with _________ sa(λ) sa(δ) sa(π) sa(2λ) HintThe sampling function denoted with sa(λ)36). Which one is a normalized function? sinc Sampling Both a and b None of the above Hintsinc is a normalized function37). The operation on signals perform only on ________ Amplitude Frequency Amplitude or time None of the above HintThe operation on signals perform only on amplitude or time38). The sgn(t) is equal to -1 when ___________ t<0 t=0 t≥0 None of the above HintThe sgn(t) is equal to -1 when t<039). ______ operations performed on amplitude Scaling Addition, subtraction Multiplication All of the above HintScaling, addition, subtraction, multiplication operations performed on amplitude40). ______ operations performed on time Scaling Shifting Reversal All of the above HintScaling, shifting, reversal operations performed on time41). For a discrete-time signals time is ______ Continuous Discrete Discrete or continuous None of the above HintFor discrete-time signals time is discrete42). For a discrete-time signals amplitude is ______ Continuous Discrete Discrete or continuous None of the above HintFor discrete-time signals amplitude is continuous43). Which one is not a normalized function? SinC Sampling Both a and b None of the above HintSampling is not a normalized function44). For discrete-time signals, both amplitude and time are ____ Continuous Discrete Discrete or continuous None of the above HintFor discrete-time signals, both amplitude and time are discrete45). The signal is said to be _______whenever we can define a signal at an instant of time Deterministic Non-deterministic Deterministic or non- deterministic None of the above HintThe signal is said to be deterministic whenever we can define a signal at an instant in time46). The signal is said to be _______whenever there is un-certainty at any particular instant of time Deterministic Non-deterministic Deterministic or non- deterministic None of the above HintThe signal is said to be non-deterministic whenever there is uncertainty at any particular instant in time47). The signal is said to be even when it satisfies the condition _______ x(t)=x(t) x(t)=x(2t) x(t)=x(-t) x(t)=-x(-t) HintThe signal is said to be even when it satisfies the condition x(t)=x(-t)48). The sum of two or more even functions, a product of two or more even functions o product of even number and odd functions results ______ function Even Odd Even or odd None of the above HintThe sum of two or more even functions, a product of two or more even functions o product of even number and odd functions results even function49). A signal said to be periodic if it satisfies the condition _________ x(t)=x(t) x(t)=x(2t) x(t)=x(-t) x(t)=x(t+T) HintA signal said to be periodic if it satisfies the condition x(t)=x(t+T)50). The smallest value of T which satisfies the ___________ condition is called the fundamental time period x(t)=x(t+T) x(t)=x(T) x(t+T)=x(t-1) None of the above HintThe smallest value of T which satisfies the x(t)=x(t+T) condition is called the fundamental time periodSignals and Systems MCQs for Students51). When two periodic sinusoids added then the result is ________ Sinusoidal signal Periodic signal Both a and b None of the above HintWhen two periodic sinusoids added then the result is a sinusoidal signal and it is said to be periodic when two signals of different frequencies are added52). The signal is said to be odd when it satisfies the condition _____________ x(t)=x(t) x(t)=x(2t) x(t)=x(-t) x(t)=-x(-t) HintThe signal is said to be odd when it satisfies the condition x(t)=-x(-t)53). The sum of two or more odd functions or product of the odd number of odd functions results in ______ function Even Odd Even or odd None of the above HintThe sum of two or more odd functions or product of the odd number of odd functions results in odd function54). _______ methods are used to find whether the signal is periodic or not Ratio method GCD method Both a and b None of the above HintBoth ratio and GCD methods are used to find whether the signal is periodic or not55). A signal is said to be a power/energy signal if the total energy/power transmitted is ________ One Zero Finite None of the above HintA signal is said to be a power/energy signal if the total energy/power transmitted is finite56). ________ system satisfies the superposition principle Linear Non-linear Causal Non-causal HintLinear system satisfies the superposition principle57). The system is said to be __________ if its input, output characteristics changes with time Time variant Time invariant Both a and b None of the above HintIf its input, output characteristics change with time then the system is said to be time-variant58). The condition for time variance is _____ y(n,k)=y(n-k) y(n,k)=y(n+k) y(n,k)=y(nk) None of the above HintThe condition for time variance is y(n,k)=y(n-k)59). The system is said to be _______ when it satisfies with linearity and time-variant Linear time-variant Non-linear time-variant Both a and b None of the above HintThe system is said to be a linear time-variant when it satisfies with linearity and time-variant60). ________ system is a memory less system Static Dynamic Both and b None of the above HintStatic system is a memory less system61). A system is said to be _____ if its response is dependent upon the present and past inputs and doesn’t depend upon future input Causal Non-causal Time variant None of the above HintA system is said to be causal if its response is dependent upon the present and past inputs and doesn’t depend upon future input62). All non-causal systems are _________ Dynamic Static Either static or dynamic None of the above HintAll non-causal systems are dynamic63). All static systems are _____________ Causal Non-causal Either causal or non-causal None of the above HintAll static systems are causal but all causal systems may not be static64). A system said to be _______ when it produces bounded output for a bounded input Stable Linear Causal Non-causal HintA system said to be stable when it produces bounded output for a bounded input65). The impulse response of a system can be represented with _______ h(t) h(n) h(t) or h(n) None of the above HintThe impulse response of a system can be represented with h(t) or h(n)66). All finite duration signals with finite amplitude are said to be ______ signal Ramp Power Energy None of the above HintAll finite duration signals with finite amplitude are said to be energy signal67). All periodic signals are _________ signals Ramp Power Energy None of the above HintAll periodic signals are power signals68). The continuous impulse is a ________ signal Ramp Power Energy Neither energy nor power HintThe continuous impulse is neither energy nor power signal69). A discrete signal x(n) is said to be periodic when _______ x(n)=x(n+N) x(n)=x(n-N) x(n)=x(nN) x(n)=x(2nN) HintA discrete signal x(n) is said to be periodic when x(n)=x(n+N)70). _____ system is a memory system Static Dynamic Static or dynamic None of the above HintDynamic system is a memory system71). In _______ system, the output depends upon future input also Causal Non-causal Both a and b None of the above HintIn a non-causal system, the output depends upon future input also72). The system is said to be _____ when it produces unbounded output for a bounded input Unstable Stable Causal Linear HintThe system is said to be unstable when it produces unbounded output for a bounded input73). By using __________ we can find the zero state response of the system Convolution Correlation Both a and b None of the above HintBy using convolution we can find the zero state response of the system74). The convolution is a mathematical operation that express _________ relation of an LTI system Input Output Input and output None of the above HintThe convolution is a mathematical operation that expresses the input and output relation of an LTI system75). _______ are the properties of convolution Commutative, distributive Associative, shift Convolution with impulse All of the above HintCommutative, distributive, associative, shift, convolution with impulse are the properties of convolutionSignals and Systems MCQs for Interviews76). The convolution with impulse property states that ________ x(t)*δ(t)=x(t) x(t)*δ(t)=x(-t) x(t)*δ(t)=x(2t) x(t)*δ(t)=-x(-t) HintThe convolution with impulse property states that x(t)*δ(t)=x(t)77). When input signals are scaled by α then the output will be _________ x(αt)*h(αt)=1/| α| y(αt) x(αt)*h(αt)=1/| α| y(α) x(t)*h(t)=1/| α| y(αt) None of the above HintWhen input signals are scaled by α then the output will be x(αt)*h(αt)=1/| α| y(αt)78). ______ are the conditions of Dirichlet Function should be absolutely integrable There must be a finite number of maxima and minima in the function There must be a finite number of discontinuous in the function All of the above HintThe conditions of Dirichlet are function should be absolutely integrable, and there must be a finite number of maxima and minima in the function, and also there must be a finite number of discontinuous in the function79). If x(n) is real and even signal then Fourier series coefficient will be ________ Imaginary and odd Imaginary and even Real and odd Real and even All of the above HintIf x(n) is real and even signal then Fourier series coefficient will be imaginary and odd, imaginary and even, real and odd, and real and even80). If the signal that we want to represent in terms of Fourier series is real and even then the fourier series coefficient will be _______ Imaginary and odd Imaginary and even Real and odd Real and even HintIf the signal that we want to represent in terms of Fourier series is real and even then the Fourier series coefficient will be real and even81). If the signal that we want to represent in terms of Fourier series is real and odd then the Fourier series coefficient will be _______ Imaginary and odd Imaginary and even Real and odd Real and even HintIf the signal that we want to represent in terms of Fourier series is real and odd then the Fourier series coefficient will be imaginary and odd82). If the signal that we want to represent in terms of Fourier series is imaginary and even then the Fourier series coefficient will be _______ Imaginary and odd Imaginary and even Real and odd Real and even HintIf the signal that we want to represent in terms of Fourier series is imaginary and even then the Fourier series coefficient will be imaginary and even83). If the signal that we want to represent in terms of Fourier series is imaginary and odd then the Fourier series coefficient will be _______ Imaginary and odd Imaginary and even Real and odd Real and even HintIf the signal that we want to represent in terms of Fourier series is imaginary and odd then the Fourier series coefficient will be real and odd84). The example of real and even signal is _________ Cos t Sin t i cos t None of the above HintThe example of real and even signal is Cos t85). The example of real and odd signal is _________ Cos t Sin t i cos t None of the above HintThe example of real and odd signal is Sin t86). The example of imaginary and even signal is _________ Cos t Sin t i cos t None of the above HintThe example of imaginary and even signal is i cos t87). The region of convergence _______ Decides whether the system is variable or stable Decides whether the sequence is non-causal or causal Both a and b None of the above HintThe region of convergence decides whether the system is variable or stable and also decides whether the sequence is non-causal or causal 88). A signal x(t) and its Hilbert transform is having _________ Same amplitude spectrum Same autocorrelation function Same energy spectral density All of the above HintA signal x(t) and its Hilbert transform is having the same amplitude spectrum, same autocorrelation function, and same energy spectral density89). How many types of correlations are there? One Two Three Four HintThere are two types of correlations are there they are auto and cross-correlations90). _______________ function gives measure of match or similarity or coherence between a signal and its time shifted version Cross-correlation Auto-correlation Auto or cross-correlation None of the above HintAuto-correlation function gives the measure of match or similarity or coherence between a signal and its time-shifted version91). _______________ is the measure of similarity between one signal and the time delayed version of other signal Cross-correlation Auto-correlation Auto or cross-correlation None of the above HintCross-correlation is the measure of similarity between one signal and the time-delayed version of other signals92). What is the ROC of δ(n)? One Zero Infinity None of the above HintThe ROC of δ(n) is one93). What is the ROC of z-transform of δ(n+1)? One Zero Z None of the above HintThe ROC of z-transform of δ(n+1) is Z94). The analysis of discrete-time LTI system is _____________ Z-transforms Hilbert transforms Either Z-transforms or Hilbert transforms None of the above HintThe analysis of discrete-time LTI system is Z-transforms95). ________ sampling works based on the multiplication Ideal Natural Flat top None of the above HintIdeal sampling works based on the multiplication96). The noise interference in ideal sampling is ________ Very high High Less Very less HintThe noise interference in ideal sampling is very less97). The sampling theory is a process to convert ___________ Continuous to discrete-time signal Discrete-time to continuous time signal Both a and b None of the above HintThe sampling theory is a process to convert the continuous-time signal into a discrete-time signal98). How many types of samplings are there? One Two Three Four HintThere are three types of samplings are there they are ideal, natural, and flat top samplingsRead more about Sampling99). Auto-correlation function of the power signal is maximum at the origin so we can say that _____ R(0)≥R(τ) R(0)=R(τ) R(0) None of the above HintThe auto-correlation function of the power signal is maximum at the origin so we can say that R(0)≥R(τ)100). __________ sampling works based on chopping Ideal Natural Flat top None of the above HintNatural sampling works based on choppingSignals and Systems MCQs for Quiz101). The noise interference in natural sampling is _______ Very high High Low Very low HintThe noise interference in natural sampling is very low102). If there is no similarity between x(t) and x(t-τ) then autocorrelation will be _______ One Zero Infinite None of the above HintIf there is no similarity between x(t) and x(t-τ) then autocorrelation will be zero103). If a sequence is purely right-sided sequence or causal then region of convergence is entire z-plane except at __________ z is equal to 0 z is equal to ∞ z is equal to 0 and z is equal to ∞ None of the above HintIf a sequence is purely right-sided sequence or causal then region of convergence is the entire z-plane except at z is equal to zero104). If a sequence is purely left-sided sequence or anti-causal then region of convergence is entire z-plane except at __________ z is equal to 0 z is equal to ∞ z is equal to 0 and z is equal to ∞ None of the above HintIf a sequence is a purely left-sided sequence or anti-causal then the region of convergence is the entire z-plane except at z is equal to ∞105). For a two-sided sequence region of convergence is entire z-plane except at __________ z is equal to 0 z is equal to ∞ z is equal to 0 and z is equal to ∞ None of the above HintFor a two-sided sequence region of convergence is entire z-plane except at z is equal to 0 and z is equal to ∞106). The z-transform for discrete impulse function δ(n) is equivalent to one, for this type of impulse function the region of convergence is entire z-plane ____________ Including z is equal to 0 Including z is equal to ∞ Including z is equal to 0 and z is equal to ∞ None of the above HintThe z-transform for discrete impulse function δ(n) is equivalent to one, for this type of impulse function the region of convergence is entire z-plane including z is equal to 0 and z is equal to ∞107). The z-transform for discrete impulse function δ(n+1) is equivalent to z, for this type of impulse function the region of convergence is entire z-plane ____________ Including z is equal to 0 Including z is equal to ∞ Including z is equal to ∞ and excluding z is equal to 0 None of the above HintThe z-transform for discrete impulse function δ(n+1) is equivalent to z, for this type of impulse function the region of convergence is entire z-plane including z is equal to ∞ and excluding z is equal to 0108). The ROC in z-transform indicated as ___________ Square Rectangle Circle None of the above HintThe ROC in z-transform indicated as a circle109). The z-transform of a discrete-time signal x(n) is represented by _________ x(n)↔x(z) x(z)↔x(n) x(n)↔x(t) x(t)↔x(n) HintThe z-transform of a discrete-time signal x(n) is represented by x(n)↔x(z)110). _____ sampling works based on a sample and hold Natural Ideal Flat top None of the above HintFlat top sampling works based on a sample and hold111). The noise interference in flat top sampling is ______ Very high High Less Very less HintThe noise interference in flat top sampling is high112). The ZT and DTFT are equal when r is equal to __________ One Zero Infinity None of the above HintThe ZT and DTFT are equal when r is equal to one113). The ROC is the entire Z-plane for ________ sequence Right-hand Left-hand Either right or left hand None of the above HintThe ROC is the entire Z-plane for right-hand sequence114). The z-transform of u(-n) is _______ 1/z 1/1-z 1/z+1 None of the above HintThe z-transform of u(-n) is 1/1-z115). The white noise spectral density is _____ Planar Uniform Both a and b None of the above HintThe white noise spectral density is uniform116). The frequency-domain representation of time-domain u(t) is __________ 2πδω 1/jw+ πδ(ω) πδω None of the above HintThe frequency-domain representation of time-domain u(t) is 1/jw+ πδ(ω)117). The time-domain representation of frequency domain δ(ω) is ______ One Zero Infinity None of the above HintThe time-domain representation of frequency domain δ(ω) is one118). The state is the group of_________ , which summarizes the history of the system to predict the future values Variable Bits Bytes None of the above HintThe state is the group of variables, which summarizes the history of the system in order to predict the future values119). The smallest set of variables that determines the state of the system are known as ______ State State variables State vector None of the above HintThe smallest set of variables that determines the state of the system is known as state variables120). _______ is the vector that contains the state variables as elements State State variables State vector None of the above HintState vector is the vector that contains the state variables as elements121). The advantages of state-space analysis are ______ Analysis is done by considering initial conditions More accurate than transfer function Analysis of multi-input and multi-output system will be made easy by the state space analysis techniques All of the above HintIn state-space analysis, the analysis is done by considering initial conditions, and it is more accurate than transfer function, and the analysis of multi-input and the multi-output system will be made easy by the state space analysis techniques122). The disadvantages of state-space analysis are ______ Techniques are complex Many computations are required Both a and b None of the above HintIn state-space analysis techniques are complex but the process is easy and many computations are required123). Which signal is used for processing digital signals? Continuous-time Discrete-time Both a and b None of the above HintA Discrete-time signal is used for processing digital signals124). The variable of the continuous-time denoted by _______ t n c t or n None of the above HintThe variable of the continuous-time denoted by t125). The variable of the discrete-time denoted by _______ t n t or n None of the above HintThe variable of the discrete-time denoted by nSignals and Systems MCQs for Exams126). ____________ is the process of reconstruction from its sampled output Interpolation Convolution Correlation None of the above HintInterpolation is the process of reconstruction from its sampled output 127). The nquist rate of sin4000πt is _____ 1000Hz 2000Hz 3000Hz 4000Hz HintThe nquist rate of sin4000πt is 4000Hz128). The maximum frequency of sin4000πt is _____ 1000Hz 2000Hz 3000Hz 4000Hz HintThe maximum frequency of sin4000πt is 2000Hz129). The nquist rate of sin200πt is _____ 100Hz 200Hz 300Hz 400Hz HintThe nquist rate of sin200πt is 200Hz130). The nquist rate of sin(400t)*sinc(600t) is _____ 100 samples/sec 200 samples/sec 300 samples/sec 400 samples/sec HintThe nquist rate of sin(400t)*sinc(600t) is 400 samples/sec131). A ________ is a frequency selective network Filter Comparator Integrator None of the above HintA filter is a frequency selective network132). An LTI system acts as a _______ Filter Comparator Integrator None of the above HintAn LTI system acts as a filter 133). The nquist rate of cos(2000πt)*sin(6000πt) is _____ 1000 samples/sec 2000 samples/sec 6000 samples/sec 4000 samples/sec HintThe nquist rate of cos(2000πt)*sin(6000πt) is 6000 samples/sec 134). Filters allow transmission of signals in a __________________ Certain band of frequencies Out of the band the frequencies will be rejected Both a and b None of the above HintFilters allow transmission of signals in a certain band of frequencies and out of the band that frequencies will be rejected135). Whichever the frequencies is allowed by the LTI system or the filter is called _________ Pass-band Stop-band Either pass-band or stop-band None of the above HintWhichever the frequencies are allowed by the LTI system or the filter is called pass-band136). In _______ band, a certain band of frequencies are is allowed and rest of the frequencies are allowed by the filter Pass-band Stop-band Either pass-band or stop-band None of the above HintIn stop-band, a certain band of frequencies are is allowed and the rest of the frequencies are allowed by the filter137). How many types of filters are there? Two Five Six Eight HintThere are five types of filters are there they are high-pass, low-pass, band-stop, band-pass, and all-passRead more about Filters 138). The nyquist rate of sinc(200t)*sinc(600t) is _____ 100 samples/sec 200 samples/sec 600 samples/sec 400 samples/sec HintThe nyquist rate of sinc(200t)*sinc(600t) is 600 samples/sec 139). The change of input signals shape when it is transmitted through a system is called _________ Distortion Interpolator Discriminator None of the above HintThe change of input signals shape when it is transmitted through a system is called distortion140). If one input and one output is given to the system then that system is called ______ SISO MIMO SIMO MISO HintIf one input and one output is given to the system then that system is called a single input single output system141). The ratio of Fourier transform of the output signal to the Fourier transform of the input signal is called ____________ Transfer function Hilbert transform Z-transform None of the above HintThe ratio of Fourier transform of the output signal to the Fourier transform of the input signal is called transfer function142). If two or more inputs and two or more outputs are given to the system then that system is called ______ SISO MIMO SIMO MISO HintIf two or more inputs and two or more outputs are given to the system then that system is called multiple inputs multiple outputs system143). The maximum frequency of sinc(200t)*sinc(600t) is _____ 100Hz 300Hz 600Hz 400Hz HintThe maximum frequency of sinc(200t)*sinc(600t) is 300Hz144). Which one is a transformation technique? Fourier series Fourier transform Z- transform All of the above HintFourier series, Fourier transform, Z- transform all are transformation techniques145). The Fourier series, and Fourier transform is given by a french mathematician John Batiste Joseph Fourier in _________ 1768-1830 1990 2000 2001 HintThe Fourier series and Fourier transform is given by a french mathematician John Batiste Joseph Fourier in 1768-1830Read more about Fourier Series and Fourier Transform146). The periodic signals ________ time signals Continuous Discrete Both a and b None of the above HintThe periodic signals may be continuous and discrete-time signals 147). How many types of Fourier transforms are there? One Two Three Four HintThere are two types of Fourier transforms are there they are continuous-time and discrete-time Fourier transforms148). The nyquist rate of sinc(400t)*sinc(600t) is _____ 1000 samples/sec 200 samples/sec 600 samples/sec 400 samples/sec HintThe nyquist rate of sinc(400t)*sinc(600t) is 1000 samples/sec149). How many types of Fourier series are there? One Two Three Four HintThere are two types of Fourier series are there they are continuous-time, and discrete-time Fourier series150). Which transform is only for a continuous-time? Laplace transform Z-transform Both a and b None of the above HintLaplace transform is only for a continuous timeSignals and Systems MCQs with Answers151). Which transform is only for a discrete-time? Laplace transform Z-transform Both a and b None of the above HintZ-transform is only for a discrete-time152). _________ are for the analysis purpose Fourier series Fourier transforms Laplace and z-transform Both a and b HintFourier series and Fourier transforms are for the analysis purpose153). _________ transforms are for the design purpose Fourier series Fourier transforms Laplace and z-transform None of the above HintLaplace and z-transform are for the design purpose154). The number of cycles per second is a ________ Frequency Amplitude Voltage None of the above HintThe number of cycles per second is a frequency155). How much time taken by the signal is called the _____________ Fundamental time period Transfer function Time period None of the above HintThe time taken by the signal is called the fundamental time period156). In T seconds one cycle has finished and in one second how many cycles has finished means _____ T cycles 1/T cycles 2T cycles 4T cycles HintIn T seconds one cycle has finished and in one second how many cycles has finished means 1/T cycles157). _________ is also used to calculate the power and phase constant of a particular harmonic present in the expansion Fourier series Fourier transforms Laplace and z-transform None of the above HintFourier series is also used to calculate the power and phase constant of a particular harmonic present in the expansion158). There are _______ Fourier series methods One Two Three Four HintThere are three Fourier series methods they are trigonometric, complex, and polar, harmonic Fourier series methods159). The system output y(t)=x(t),if t=0 then the output is dependent on _______ Present input Past input Both a and b None of the above HintThe system output y(t)=x(t),if t=0 then the output is dependent on present input160). The system output y(t)=x(t-1),if t=0 then the output is dependent on _______ Present input Past input Both a and b None of the above HintThe system output y(t)=x(t-1),if t=0 then the output is dependent on past input161). The system output y(t)=x(t+1),if t=0 then the output is dependent on _______ Present input Past input Future input None of the above HintThe system output y(t)=x(t+1),if t=0 then the output is dependent on future input162). The power of energy signals is equivalent to _______ One Zero Infinity None of the above HintThe power of energy signals is equivalent to zero163). The energy of power signals is equivalent to _______ One Zero Infinity None of the above HintThe energy of power signals is equivalent to infinity164). The real and complex exponential signal can be defined in __________ Only continuous-time Only discrete-time Both in discrete and continuous-time None of the above HintThe real and complex exponential signal can be defined in both discrete and continuous-time165). __________ are the examples of systems Electrical circuits Mechanical systems Chemical and biological systems All of the above HintElectrical circuits, mechanical systems, chemical and biological systems, etc are the examples of systems166). If f(t)=f(t+T) then the signal is ________ Continuous-time Discrete-time Both in discrete and continuous-time None of the above HintIf f(t)=f(t+T) then the signal is continuous-time signal167). If f(t)=f(-t) then the signal is said to be ________ Odd Even Either odd or even None of the above HintIf f(t)=f(-t) then the signal is said to be even168). Interconnection patterns are of _________ types One Two Three Four HintInterconnection patterns are of three types they are serial, parallel, and feedback interconnections169). __________ is an example of an invertible system y(t)=αx(t) y(t)=x(t) y(t)=2x(t) None of the above Hinty(t)=αx(t) is an example of an invertible system170). If distinct inputs lead to distinct outputs then the system is said to be ___________ Invertibility Causality Non-causality None of the above HintIf distinct inputs lead to distinct outputs then the system is said to be invertibility171). The system is said to be linear if it satisfies the ________ properties Scaling Additivity Both a and b None of the above HintThe system is said to be linear if it satisfies the scaling and additivity properties172). The speech signal is the example of ___________ dimensional signal One Two Multi None of the above HintThe speech signal is an example of a one-dimensional signal173). ______ is an example of multi-dimensional signal Speech Image Both a and b None of the above HintImage is an example of a multi-dimensional signal174). Which signal has infinite duration? Power Energy Both a and b None of the above HintPower signal has infinite duration175). _____ are the elementary signals Step function Impulse function Ramp function All of the above HintStep function, impulse function, and ramp function are the elementary signalsSignals and Systems MCQs for Engineers176). Which one is an example of causal systems? y[n]=x[n]+1/2x[n-1] y[n]=x[n]+1/2x[n+1] y[n]=x[n]+1/2x[n] None of the above Hinty[n]=x[n]+1/2x[n-1] is an example of causal systems177). In ________ system the value of the present output depends on past/future input Memory system Memory less system Non-causal None of the above HintIn a memory system the value of the present output depends on past/future input178). ______ system consists of delay elements, differentiation, integration, in their equation Static system Dynamic system Both a and b None of the above HintDynamic system consists of delay elements, differentiation, integration, in their equation179). Which one is an example of a non-causal system? y[n]=x[n]+1/2x[n-1] y[n]=x[n+1]+1/2x[n-1] y[n]=x[n]+1/2x[n] None of the above Hinty[n]=x[n+1]+1/2x[n-1] is an example of a non-causal system180). In ________ system the value of the present output depends on present input Memory system Memory less system Dynamic system Static system HintIn a memory less system the value of the present output depends on the present input181). The sampling rate of telephony is around _______ 2KHz 4KHz 8KHz 10KHz HintThe sampling rate of telephony is around 8KHz182). The bandwidth of telephony is around _______ 100-1000KHz 1000-11000KHz 200-1000KHz 300-3400Hz HintThe bandwidth of telephony is between 300-3400Hz183). The bit rate of telephony is around _______ 2.4-64 Kbit/sec 2.4-4 Kbit/sec 2.4-8 Kbit/sec 2.4-16 Kbit/sec HintThe bit rate of telephony is around 2.4-64 Kbit/sec184). The sampling rate of high fidelity music is around _______ 2KHz 44.1KHz 8KHz 10KHz HintThe sampling rate of high fidelity music is around 44.1KHz185). The bandwidth of high fidelity music is around _______ 5Hz-1000KHz 5Hz-10KHz 5Hz-20KHz 300-3400Hz HintThe bandwidth of high fidelity music is around 5Hz-20KHz186). The standard audio rate of compact rate is around _________ 10.1KS/s 20.1KS/s 30.1KS/s 44.1KS/s HintThe standard audio rate of compact rate is around 44.1KS/s187). The standard audio rate of a DVD system is around _________ 10KS/s 20KS/s 60KS/s 96KS/s HintThe standard audio rate of a DVD system is around 96KS/s188). The data rate of FM radio is ______ 22KB/sec 33KB/sec 66KB/sec 88.2KB/sec HintThe data rate of FM radio is 88.2KB/sec189). The frequency band of FM radio is between _____ 0.1-5KHz 0.01-5KHz 0.002-11KHz 0.1-5Hz HintThe frequency band of FM radio is between 0.002-11KHz190). The sampling rate of AM radio is around _______ 2KHz 11.025KHz 8KHz 10KHz HintThe sampling rate of AM radio is around 11.025KHz191). The data rate depends on ________ Available bandwidth Level of the signals we use Quality of the channel All of the above HintThe data rate depends on available bandwidth, the level of the signals we use, and the quality of the channel192). The average frequency of human voices is _________ 10Hz to 10KHz 120Hz to 10KHz 125Hz to 10KHz 125Hz to 8KHz HintThe average frequency of human voices is 125Hz to 8KHz193). How many ways are there to represent discrete-time signals? One Two Three Four HintIn three ways the discrete-time signals are represented are a functional, tabular method of representation and sequence representation194). Which system doesn’t have feedback? Recursive Non-recursive Both a and b None of the above HintNon-recursive system doesn’t have feedback195). Which one is an example of a recursive system? y(n)=x(n)+y(n-2) y(n)=x(n)+y(n+1) y(n)=x(n-1)+y(n-1) y(n)=x(n+1)+y(n-1) Hinty(n)=x(n)+y(n-2) is an example of a recursive system196). Which one is an example of a non-recursive system? y(n)=x(n)+y(n-1) y(n)=x(n)+x(n-1) y(n)=x(n-1)+y(n-1) y(n)=x(n+1)+y(n-1) Hinty(n)=x(n)+x(n-1) is an example of a non-recursive system Time is Up! Time's up