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 operation 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. 1). The impulse function is denoted by _______u(t)δ(t)u(t) or δ(t)None of the aboveHintThe impulse function denoted by δ(t) 2). The impulse function is _______ when t=0OneZeroInfinityNone of the aboveHintThe impulse function is one when t=0 3). Whenever the amplitude of step function is equivalent to one then that is ______ signalUnitStepImpulseNone of the aboveHintWhenever the amplitude of step function is equivalent to one then that is unit signal 4). When t≥0, the unit signal amplitude must be ________OneZeroInfinityNone of the aboveHintWhen t≥0, the unit signal amplitude must be one 5). When t<0, the unit signal amplitude must be ________OneZeroInfinityNone of the aboveHintWhen t<0, the unit signal amplitude must be zero 6). The discrete-time always indicated with nTrueFalseHintYes, 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 ___________ signalUnitStepImpulseNone of the aboveHintWhenever the amplitude of step function is more than one then that is called a step signal 8). The continuous-time always indicated with tTrueFalseHintYes, the continuous-time always indicated with t, for example u(t) 9). How many inputs does the system have?Only oneOnly twoOne or more inputsNone of the aboveHintA system has one or more than one inputs 10). Signal is a _________Time variantIt is a physical phenomenonConveys informationAll of the aboveHintA signal is a time-variant, and it is a physical phenomenon, and its main intention is to convey information 11). ________ are the examples of signalHuman voiceElectrical signalsVoltage on telephone wiresAll of the aboveHintHuman voice, electrical signals, the voltage on telephone wires, etc are examples of signal 12). The inputs of the system are called _____ExcitationResponseBoth a and bNone of the aboveHintThe inputs of the system are always excitation 13). In a ______ signal, we can define the value of the signal at any instant of time?ContinuousDiscreteBoth a and bNone of the aboveHintIn a continuous signal, we can define the value of the signal at any instant in time 14). In a _________ signal, we can’t define the value of the signal at any instant of time?ContinuousDiscreteBoth a and bNone of the aboveHintIn a discrete signal, we can’t define the value of the signal at any instant in time 15). Time scaling won’t work for the ____________ functionUnit stepImpulseBoth a and bNone of the aboveHintThe time scaling won’t work for the unit step function 16). The impulse function is _______ when t≠0OneZeroInfinityNone of the aboveHintThe impulse function is zero when t≠0 17). When n=k, δ(n-k) is _______OneZeroInfinityNone of the aboveHintWhen n=k, δ(n-k) is one 18). When n≠k, δ(n-k) is _______OneZeroInfinityNone of the aboveHintWhen n≠k, δ(n-k) is zero 19). The signum function denoted with ______s(t), s(n)sgn(t), sgn(n)Both a and bNone of the aboveHintThe signum function denoted with sgn(t), sgn(n) 20). How many outputs does the system have?Only oneOnly twoOne or more outputsNone of the aboveHintA system has one or more outputs 21). The outputs of the system are called ________ExcitationResponseBoth a and bNone of the aboveHintThe outputs of the system is always the response 22). A __________ is an example of the systemCommunication systemOscilloscopesModemAll of the aboveHintA communication system, oscilloscopes, modems, etc are examples of the system 23). The standard form of LTI is ___________ Time-Invariant SystemLinearNon-linearEither linear or non-linearNone of the aboveHintThe standard form of LTI is Linear Time-Invariant System 24). The unit step signal is denoted with _______u(t)u(n)u(t) or u(n)None of the aboveHintThe unit step signal is denoted with u(t) or u(n) 25). ________ are the properties of impulse functionδ(n)-u(n)-u(n-1)f(t) δ(t)=f(0)δ(-t)= δ(t)All of the aboveHintδ(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 Hints 26). The sgn(t) is equal to one when ______t>ot<0t=0None of the aboveHintThe sgn(t) is equal to one when t>o 27). The relation between u(t) and sgn() is _______sgn(t)=u(t)-1sgn(t)=2u(t)-1sgn(t)=2u(t)+1None of the aboveHintThe relation between u(t) and sgn() is sgn(t)=2u(t)-1 28). The unit ramp signal denoted by ________u(t)sgn(t)r(t) or r(n)None of the aboveHintThe unit ramp signal denoted by r(t) or r(n) 29). The r(t)=t when __________t<0t=0t≥0None of the aboveHintThe r(t)=t when t≥0 30). The r(t)=0 when __________t<0t=0t≥0None of the aboveHintThe r(t)=0 when t<0 31). The unit parabolic signal is zero when _________t<0t=0t≥0None of the aboveHintThe unit parabolic signal is zero when t<0 32). x(t)=A rect (t/T) is a representation of ________Rectangular signalUnit signalRamp signalNone of the aboveHintx(t)=A rect (t/T) is a representation of a rectangular signal 33). The sgn(t) is equal to zero when ________t<0 b)c) d)t=0t≥0None of the aboveHintThe sgn(t) is equal to zero when t=0 34). 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?sincSamplingBoth a and bNone of the aboveHintsinc is a normalized function 37). The operation on signals perform only on ________AmplitudeFrequencyAmplitude or timeNone of the aboveHintThe operation on signals perform only on amplitude or time 38). The sgn(t) is equal to -1 when ___________t<0t=0t≥0None of the aboveHintThe sgn(t) is equal to -1 when t<0 39). ______ operations performed on amplitudeScalingAddition, subtractionMultiplicationAll of the aboveHintScaling, addition, subtraction, multiplication operations performed on amplitude 40). ______ operations performed on timeScalingShiftingReversalAll of the aboveHintScaling, shifting, reversal operations performed on time 41). For a discrete-time signals time is ______ContinuousDiscreteDiscrete or continuousNone of the aboveHintFor discrete-time signals time is discrete 42). For a discrete-time signals amplitude is ______ContinuousDiscreteDiscrete or continuousNone of the aboveHintFor discrete-time signals amplitude is continuous 43). Which one is not a normalized function?SinCSamplingBoth a and bNone of the aboveHintSampling is not a normalized function 44). For discrete-time signals, both amplitude and time are ____ContinuousDiscreteDiscrete or continuousNone of the aboveHintFor discrete-time signals, both amplitude and time are discrete 45). The signal is said to be _______whenever we can define a signal at an instant of timeDeterministicNon-deterministicDeterministic or non- deterministicNone of the aboveHintThe signal is said to be deterministic whenever we can define a signal at an instant in time 46). The signal is said to be _______whenever there is un-certainty at any particular instant of timeDeterministicNon-deterministicDeterministic or non- deterministicNone of the aboveHintThe signal is said to be non-deterministic whenever there is uncertainty at any particular instant in time 47). 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 ______ functionEvenOddEven or oddNone of the aboveHintThe 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 function 49). 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 periodx(t)=x(t+T)x(t)=x(T)x(t+T)=x(t-1)None of the aboveHintThe smallest value of T which satisfies the x(t)=x(t+T) condition is called the fundamental time periodSignals and Systems MCQs for Students 51). When two periodic sinusoids added then the result is ________Sinusoidal signalPeriodic signalBoth a and bNone of the aboveHintWhen 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 added 52). 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 ______ functionEvenOddEven or oddNone of the aboveHintThe sum of two or more odd functions or product of the odd number of odd functions results in odd function 54). _______ methods are used to find whether the signal is periodic or notRatio methodGCD methodBoth a and bNone of the aboveHintBoth ratio and GCD methods are used to find whether the signal is periodic or not 55). A signal is said to be a power/energy signal if the total energy/power transmitted is ________OneZeroFiniteNone of the aboveHintA signal is said to be a power/energy signal if the total energy/power transmitted is finite 56). ________ system satisfies the superposition principleLinearNon-linearCausalNon-causalHintLinear system satisfies the superposition principle 57). The system is said to be __________ if its input, output characteristics changes with timeTime variantTime invariantBoth a and bNone of the aboveHintIf its input, output characteristics change with time then the system is said to be time-variant 58). 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 aboveHintThe 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-variantLinear time-variantNon-linear time-variantBoth a and bNone of the aboveHintThe system is said to be a linear time-variant when it satisfies with linearity and time-variant 60). ________ system is a memory less systemStaticDynamicBoth and bNone of the aboveHintStatic system is a memory less system 61). A system is said to be _____ if its response is dependent upon the present and past inputs and doesn’t depend upon future inputCausalNon-causalTime variantNone of the aboveHintA system is said to be causal if its response is dependent upon the present and past inputs and doesn’t depend upon future input 62). All non-causal systems are _________DynamicStaticEither static or dynamicNone of the aboveHintAll non-causal systems are dynamic 63). All static systems are _____________CausalNon-causalEither causal or non-causalNone of the aboveHintAll static systems are causal but all causal systems may not be static 64). A system said to be _______ when it produces bounded output for a bounded inputStableLinearCausalNon-causalHintA system said to be stable when it produces bounded output for a bounded input 65). The impulse response of a system can be represented with _______h(t)h(n)h(t) or h(n)None of the aboveHintThe 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 ______ signalRampPowerEnergyNone of the aboveHintAll finite duration signals with finite amplitude are said to be energy signal 67). All periodic signals are _________ signalsRampPowerEnergyNone of the aboveHintAll periodic signals are power signals 68). The continuous impulse is a ________ signalRampPowerEnergyNeither energy nor powerHintThe continuous impulse is neither energy nor power signal 69). 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 systemStaticDynamicStatic or dynamicNone of the aboveHintDynamic system is a memory system 71). In _______ system, the output depends upon future input alsoCausalNon-causalBoth a and bNone of the aboveHintIn a non-causal system, the output depends upon future input also 72). The system is said to be _____ when it produces unbounded output for a bounded inputUnstableStableCausalLinearHintThe system is said to be unstable when it produces unbounded output for a bounded input 73). By using __________ we can find the zero state response of the systemConvolutionCorrelationBoth a and bNone of the aboveHintBy using convolution we can find the zero state response of the system 74). The convolution is a mathematical operation that express _________ relation of an LTI systemInputOutputInput and outputNone of the aboveHintThe convolution is a mathematical operation that expresses the input and output relation of an LTI system 75). _______ are the properties of convolutionCommutative, distributiveAssociative, shiftConvolution with impulseAll of the aboveHintCommutative, distributive, associative, shift, convolution with impulse are the properties of convolutionSignals and Systems MCQs for Interviews 76). 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 aboveHintWhen input signals are scaled by α then the output will be x(αt)*h(αt)=1/| α| y(αt) 78). ______ are the conditions of DirichletFunction should be absolutely integrableThere must be a finite number of maxima and minima in the functionThere must be a finite number of discontinuous in the functionAll of the aboveHintThe 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 function 79). If x(n) is real and even signal then Fourier series coefficient will be ________Imaginary and oddImaginary and evenReal and oddReal and evenAll of the aboveHintIf 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 even 80). 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 oddImaginary and evenReal and oddReal and evenHintIf 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 even 81). 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 oddImaginary and evenReal and oddReal and evenHintIf 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 82). 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 oddImaginary and evenReal and oddReal and evenHintIf 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 even 83). 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 oddImaginary and evenReal and oddReal and evenHintIf 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 odd 84). The example of real and even signal is _________Cos tSin ti cos tNone of the aboveHintThe example of real and even signal is Cos t 85). The example of real and odd signal is _________Cos tSin ti cos tNone of the aboveHintThe example of real and odd signal is Sin t 86). The example of imaginary and even signal is _________Cos tSin ti cos tNone of the aboveHintThe example of imaginary and even signal is i cos t 87). The region of convergence _______Decides whether the system is variable or stableDecides whether the sequence is non-causal or causalBoth a and bNone of the aboveHintThe 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 spectrumSame autocorrelation functionSame energy spectral densityAll of the aboveHintA signal x(t) and its Hilbert transform is having the same amplitude spectrum, same autocorrelation function, and same energy spectral density 89). How many types of correlations are there?OneTwoThreeFourHintThere are two types of correlations are there they are auto and cross-correlations 90). _______________ function gives measure of match or similarity or coherence between a signal and its time shifted versionCross-correlationAuto-correlationAuto or cross-correlationNone of the aboveHintAuto-correlation function gives the measure of match or similarity or coherence between a signal and its time-shifted version 91). _______________ is the measure of similarity between one signal and the time delayed version of other signalCross-correlationAuto-correlationAuto or cross-correlationNone of the aboveHintCross-correlation is the measure of similarity between one signal and the time-delayed version of other signals 92). What is the ROC of δ(n)?OneZeroInfinityNone of the aboveHintThe ROC of δ(n) is one 93). What is the ROC of z-transform of δ(n+1)?OneZeroZNone of the aboveHintThe ROC of z-transform of δ(n+1) is Z 94). The analysis of discrete-time LTI system is _____________Z-transformsHilbert transformsEither Z-transforms or Hilbert transformsNone of the aboveHintThe analysis of discrete-time LTI system is Z-transforms 95). ________ sampling works based on the multiplicationIdealNaturalFlat topNone of the aboveHintIdeal sampling works based on the multiplication 96). The noise interference in ideal sampling is ________Very highHighLessVery lessHintThe noise interference in ideal sampling is very less 97). The sampling theory is a process to convert ___________Continuous to discrete-time signalDiscrete-time to continuous time signalBoth a and bNone of the aboveHintThe sampling theory is a process to convert the continuous-time signal into a discrete-time signal 98). How many types of samplings are there?OneTwoThreeFourHintThere are three types of samplings are there they are ideal, natural, and flat top samplingsRead more about Sampling 99). 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 aboveHintThe 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 choppingIdealNaturalFlat topNone of the aboveHintNatural sampling works based on choppingSignals and Systems MCQs for Quiz 101). The noise interference in natural sampling is _______Very highHighLowVery lowHintThe noise interference in natural sampling is very low 102). If there is no similarity between x(t) and x(t-τ) then autocorrelation will be _______OneZeroInfiniteNone of the aboveHintIf there is no similarity between x(t) and x(t-τ) then autocorrelation will be zero 103). If a sequence is purely right-sided sequence or causal then region of convergence is entire z-plane except at __________z is equal to 0z is equal to ∞z is equal to 0 and z is equal to ∞None of the aboveHintIf a sequence is purely right-sided sequence or causal then region of convergence is the entire z-plane except at z is equal to zero 104). 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 0z is equal to ∞z is equal to 0 and z is equal to ∞None of the aboveHintIf 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 0z is equal to ∞z is equal to 0 and z is equal to ∞None of the aboveHintFor 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 0Including z is equal to ∞Including z is equal to 0 and z is equal to ∞None of the aboveHintThe 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 0Including z is equal to ∞Including z is equal to ∞ and excluding z is equal to 0None of the aboveHintThe 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 0 108). The ROC in z-transform indicated as ___________SquareRectangleCircleNone of the aboveHintThe ROC in z-transform indicated as a circle 109). 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 holdNaturalIdealFlat topNone of the aboveHintFlat top sampling works based on a sample and hold 111). The noise interference in flat top sampling is ______Very highHighLessVery lessHintThe noise interference in flat top sampling is high 112). The ZT and DTFT are equal when r is equal to __________OneZeroInfinityNone of the aboveHintThe ZT and DTFT are equal when r is equal to one 113). The ROC is the entire Z-plane for ________ sequenceRight-handLeft-handEither right or left handNone of the aboveHintThe ROC is the entire Z-plane for right-hand sequence 114). The z-transform of u(-n) is _______1/z1/1-z1/z+1None of the aboveHintThe z-transform of u(-n) is 1/1-z 115). The white noise spectral density is _____PlanarUniformBoth a and bNone of the aboveHintThe white noise spectral density is uniform 116). The frequency-domain representation of time-domain u(t) is __________2πδω1/jw+ πδ(ω)πδωNone of the aboveHintThe frequency-domain representation of time-domain u(t) is 1/jw+ πδ(ω) 117). The time-domain representation of frequency domain δ(ω) is ______OneZeroInfinityNone of the aboveHintThe time-domain representation of frequency domain δ(ω) is one 118). The state is the group of_________ , which summarizes the history of the system to predict the future valuesVariableBitsBytesNone of the aboveHintThe state is the group of variables, which summarizes the history of the system in order to predict the future values 119). The smallest set of variables that determines the state of the system are known as ______StateState variablesState vectorNone of the aboveHintThe smallest set of variables that determines the state of the system is known as state variables 120). _______ is the vector that contains the state variables as elementsStateState variablesState vectorNone of the aboveHintState vector is the vector that contains the state variables as elements 121). The advantages of state-space analysis are ______Analysis is done by considering initial conditionsMore accurate than transfer functionAnalysis of multi-input and multi-output system will be made easy by the state space analysis techniquesAll of the aboveHintIn 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 techniques 122). The disadvantages of state-space analysis are ______Techniques are complexMany computations are requiredBoth a and bNone of the aboveHintIn state-space analysis techniques are complex but the process is easy and many computations are required 123). Which signal is used for processing digital signals?Continuous-timeDiscrete-timeBoth a and bNone of the aboveHintA Discrete-time signal is used for processing digital signals 124). The variable of the continuous-time denoted by _______tn ct or nNone of the aboveHintThe variable of the continuous-time denoted by t 125). The variable of the discrete-time denoted by _______tnt or nNone of the aboveHintThe variable of the discrete-time denoted by nSignals and Systems MCQs for Exams 126). ____________ is the process of reconstruction from its sampled outputInterpolationConvolutionCorrelationNone of the aboveHintInterpolation is the process of reconstruction from its sampled output 127). The nquist rate of sin4000πt is _____1000Hz2000Hz3000Hz4000HzHintThe nquist rate of sin4000πt is 4000Hz 128). The maximum frequency of sin4000πt is _____1000Hz2000Hz3000Hz4000HzHintThe maximum frequency of sin4000πt is 2000Hz 129). The nquist rate of sin200πt is _____100Hz200Hz300Hz400HzHintThe nquist rate of sin200πt is 200Hz 130). The nquist rate of sin(400t)*sinc(600t) is _____100 samples/sec200 samples/sec300 samples/sec400 samples/secHintThe nquist rate of sin(400t)*sinc(600t) is 400 samples/sec 131). A ________ is a frequency selective networkFilterComparatorIntegratorNone of the aboveHintA filter is a frequency selective network 132). An LTI system acts as a _______FilterComparatorIntegratorNone of the aboveHintAn LTI system acts as a filter 133). The nquist rate of cos(2000πt)*sin(6000πt) is _____1000 samples/sec2000 samples/sec6000 samples/sec4000 samples/secHintThe nquist rate of cos(2000πt)*sin(6000πt) is 6000 samples/sec 134). Filters allow transmission of signals in a __________________Certain band of frequenciesOut of the band the frequencies will be rejectedBoth a and bNone of the aboveHintFilters allow transmission of signals in a certain band of frequencies and out of the band that frequencies will be rejected 135). Whichever the frequencies is allowed by the LTI system or the filter is called _________Pass-bandStop-bandEither pass-band or stop-bandNone of the aboveHintWhichever the frequencies are allowed by the LTI system or the filter is called pass-band 136). In _______ band, a certain band of frequencies are is allowed and rest of the frequencies are allowed by the filterPass-bandStop-bandEither pass-band or stop-bandNone of the aboveHintIn stop-band, a certain band of frequencies are is allowed and the rest of the frequencies are allowed by the filter 137). How many types of filters are there?TwoFiveSixEightHintThere 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/sec200 samples/sec600 samples/sec400 samples/secHintThe 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 _________DistortionInterpolatorDiscriminatorNone of the aboveHintThe change of input signals shape when it is transmitted through a system is called distortion 140). If one input and one output is given to the system then that system is called ______SISOMIMOSIMOMISOHintIf one input and one output is given to the system then that system is called a single input single output system 141). The ratio of Fourier transform of the output signal to the Fourier transform of the input signal is called ____________Transfer functionHilbert transformZ-transformNone of the aboveHintThe ratio of Fourier transform of the output signal to the Fourier transform of the input signal is called transfer function 142). If two or more inputs and two or more outputs are given to the system then that system is called ______SISOMIMOSIMOMISOHintIf two or more inputs and two or more outputs are given to the system then that system is called multiple inputs multiple outputs system 143). The maximum frequency of sinc(200t)*sinc(600t) is _____100Hz300Hz600Hz400HzHintThe maximum frequency of sinc(200t)*sinc(600t) is 300Hz 144). Which one is a transformation technique?Fourier seriesFourier transformZ- transformAll of the aboveHintFourier series, Fourier transform, Z- transform all are transformation techniques 145). The Fourier series, and Fourier transform is given by a french mathematician John Batiste Joseph Fourier in _________1768-1830199020002001HintThe Fourier series and Fourier transform is given by a french mathematician John Batiste Joseph Fourier in 1768-1830Read more about Fourier Series and Fourier Transform 146). The periodic signals ________ time signalsContinuousDiscreteBoth a and bNone of the aboveHintThe periodic signals may be continuous and discrete-time signals 147). How many types of Fourier transforms are there?OneTwoThreeFourHintThere are two types of Fourier transforms are there they are continuous-time and discrete-time Fourier transforms 148). The nyquist rate of sinc(400t)*sinc(600t) is _____1000 samples/sec200 samples/sec600 samples/sec400 samples/secHintThe nyquist rate of sinc(400t)*sinc(600t) is 1000 samples/sec 149). How many types of Fourier series are there?OneTwoThreeFourHintThere are two types of Fourier series are there they are continuous-time, and discrete-time Fourier series 150). Which transform is only for a continuous-time?Laplace transformZ-transformBoth a and bNone of the aboveHintLaplace transform is only for a continuous timeSignals and Systems MCQs with Answers 151). Which transform is only for a discrete-time?Laplace transformZ-transformBoth a and bNone of the aboveHintZ-transform is only for a discrete-time 152). _________ are for the analysis purposeFourier seriesFourier transformsLaplace and z-transformBoth a and bHintFourier series and Fourier transforms are for the analysis purpose 153). _________ transforms are for the design purposeFourier seriesFourier transformsLaplace and z-transformNone of the aboveHintLaplace and z-transform are for the design purpose 154). The number of cycles per second is a ________FrequencyAmplitudeVoltageNone of the aboveHintThe number of cycles per second is a frequency 155). How much time taken by the signal is called the _____________Fundamental time periodTransfer functionTime periodNone of the aboveHintThe time taken by the signal is called the fundamental time period 156). In T seconds one cycle has finished and in one second how many cycles has finished means _____T cycles1/T cycles2T cycles4T cyclesHintIn T seconds one cycle has finished and in one second how many cycles has finished means 1/T cycles 157). _________ is also used to calculate the power and phase constant of a particular harmonic present in the expansionFourier seriesFourier transformsLaplace and z-transformNone of the aboveHintFourier series is also used to calculate the power and phase constant of a particular harmonic present in the expansion 158). There are _______ Fourier series methodsOneTwoThreeFourHintThere are three Fourier series methods they are trigonometric, complex, and polar, harmonic Fourier series methods 159). The system output y(t)=x(t),if t=0 then the output is dependent on _______Present inputPast inputBoth a and bNone of the aboveHintThe system output y(t)=x(t),if t=0 then the output is dependent on present input 160). The system output y(t)=x(t-1),if t=0 then the output is dependent on _______Present inputPast inputBoth a and bNone of the aboveHintThe system output y(t)=x(t-1),if t=0 then the output is dependent on past input 161). The system output y(t)=x(t+1),if t=0 then the output is dependent on _______Present inputPast inputFuture inputNone of the aboveHintThe system output y(t)=x(t+1),if t=0 then the output is dependent on future input 162). The power of energy signals is equivalent to _______OneZeroInfinityNone of the aboveHintThe power of energy signals is equivalent to zero 163). The energy of power signals is equivalent to _______OneZeroInfinityNone of the aboveHintThe energy of power signals is equivalent to infinity 164). The real and complex exponential signal can be defined in __________Only continuous-timeOnly discrete-timeBoth in discrete and continuous-timeNone of the aboveHintThe real and complex exponential signal can be defined in both discrete and continuous-time 165). __________ are the examples of systemsElectrical circuitsMechanical systemsChemical and biological systemsAll of the aboveHintElectrical circuits, mechanical systems, chemical and biological systems, etc are the examples of systems 166). If f(t)=f(t+T) then the signal is ________Continuous-timeDiscrete-timeBoth in discrete and continuous-timeNone of the aboveHintIf f(t)=f(t+T) then the signal is continuous-time signal 167). If f(t)=f(-t) then the signal is said to be ________OddEvenEither odd or evenNone of the aboveHintIf f(t)=f(-t) then the signal is said to be even 168). Interconnection patterns are of _________ typesOneTwoThreeFourHintInterconnection patterns are of three types they are serial, parallel, and feedback interconnections 169). __________ is an example of an invertible systemy(t)=αx(t)y(t)=x(t)y(t)=2x(t)None of the aboveHinty(t)=αx(t) is an example of an invertible system 170). If distinct inputs lead to distinct outputs then the system is said to be ___________InvertibilityCausalityNon-causalityNone of the aboveHintIf distinct inputs lead to distinct outputs then the system is said to be invertibility 171). The system is said to be linear if it satisfies the ________ propertiesScalingAdditivityBoth a and bNone of the aboveHintThe system is said to be linear if it satisfies the scaling and additivity properties 172). The speech signal is the example of ___________ dimensional signalOneTwoMultiNone of the aboveHintThe speech signal is an example of a one-dimensional signal 173). ______ is an example of multi-dimensional signalSpeechImageBoth a and bNone of the aboveHintImage is an example of a multi-dimensional signal 174). Which signal has infinite duration?PowerEnergyBoth a and bNone of the aboveHintPower signal has infinite duration 175). _____ are the elementary signalsStep functionImpulse functionRamp functionAll of the aboveHintStep function, impulse function, and ramp function are the elementary signalsSignals and Systems MCQs for Engineers 176). 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 aboveHinty[n]=x[n]+1/2x[n-1] is an example of causal systems 177). In ________ system the value of the present output depends on past/future inputMemory systemMemory less systemNon-causalNone of the aboveHintIn a memory system the value of the present output depends on past/future input 178). ______ system consists of delay elements, differentiation, integration, in their equationStatic systemDynamic systemBoth a and bNone of the aboveHintDynamic system consists of delay elements, differentiation, integration, in their equation 179). 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 aboveHinty[n]=x[n+1]+1/2x[n-1] is an example of a non-causal system 180). In ________ system the value of the present output depends on present inputMemory systemMemory less systemDynamic systemStatic systemHintIn a memory less system the value of the present output depends on the present input 181). The sampling rate of telephony is around _______2KHz4KHz8KHz10KHzHintThe sampling rate of telephony is around 8KHz 182). The bandwidth of telephony is around _______100-1000KHz1000-11000KHz200-1000KHz300-3400HzHintThe bandwidth of telephony is between 300-3400Hz 183). The bit rate of telephony is around _______2.4-64 Kbit/sec2.4-4 Kbit/sec2.4-8 Kbit/sec2.4-16 Kbit/secHintThe bit rate of telephony is around 2.4-64 Kbit/sec 184). The sampling rate of high fidelity music is around _______2KHz44.1KHz8KHz10KHzHintThe sampling rate of high fidelity music is around 44.1KHz 185). The bandwidth of high fidelity music is around _______5Hz-1000KHz5Hz-10KHz5Hz-20KHz300-3400HzHintThe bandwidth of high fidelity music is around 5Hz-20KHz 186). The standard audio rate of compact rate is around _________10.1KS/s20.1KS/s30.1KS/s44.1KS/sHintThe standard audio rate of compact rate is around 44.1KS/s 187). The standard audio rate of a DVD system is around _________10KS/s20KS/s60KS/s96KS/sHintThe standard audio rate of a DVD system is around 96KS/s 188). The data rate of FM radio is ______22KB/sec33KB/sec66KB/sec88.2KB/secHintThe data rate of FM radio is 88.2KB/sec 189). The frequency band of FM radio is between _____0.1-5KHz0.01-5KHz0.002-11KHz0.1-5HzHintThe frequency band of FM radio is between 0.002-11KHz 190). The sampling rate of AM radio is around _______2KHz11.025KHz8KHz10KHzHintThe sampling rate of AM radio is around 11.025KHz 191). The data rate depends on ________Available bandwidthLevel of the signals we useQuality of the channelAll of the aboveHintThe data rate depends on available bandwidth, the level of the signals we use, and the quality of the channel 192). The average frequency of human voices is _________10Hz to 10KHz120Hz to 10KHz125Hz to 10KHz125Hz to 8KHzHintThe average frequency of human voices is 125Hz to 8KHz 193). How many ways are there to represent discrete-time signals?OneTwoThreeFourHintIn three ways the discrete-time signals are represented are a functional, tabular method of representation and sequence representation 194). Which system doesn’t have feedback?RecursiveNon-recursiveBoth a and bNone of the aboveHintNon-recursive system doesn’t have feedback 195). 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 system 196). 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!