Discrete Time Signal and Systems Question & AnswersFebruary 9, 2022 By WatElectronics This article lists 100 Discrete-Time Signals and Systems MCQs for Engineering Students. All the Discrete-Time Signal and Systems Questions & Answers given below includes solution and link wherever possible to the relevant topic.Smartphones became one of the most essential gadgets to lead a balanced life in urban society. One of the advanced features of the smartphone is the speech recognition technology, through speech recognition we can make calls and access the apps on smartphones. When we ask the smartphone to call the specific contact the sound vibrations are created in the air which receives in the analog signal, smartphones cannot understand the analog signal, hence this analog signal must be converted into a discrete-time signal and this can be done by the help of analog to digital converter.The discrete variables are obtained by counting and represented by isolated points, whereas the continuous variables are obtained by measuring and represented by connected points. The number of pages in a book is an example for discrete and the length of a film is an example for continuous data. The discrete-time signal is a digital representation of a continuous-time signal, the discrete-time signals are used for the processing of digital signals whereas the continuous-time signals are not useful for the processing of digital signals. The discrete-time variables are denoted by a letter n and the continuous-time variables are denoted by a letter t.1). How many outcomes are possible in binomial distribution? One Two Three Four HintIn binomial distribution, only two outcomes are possible whereas in Poisson distribution the possibility of outcomes are unlimited2). In which one of the following distributions the mean is greater than variance? Binomial Poisson Both a and b None of the above HintIn Poisson distribution, the mean is equal to the variance3). What is the meaning of the parameter 'n' in uniform distribution? Number of items Number of trials Size of population None of the above HintThe n=number of trials in binomial distribution and n=size of the population in the hypergeometric distribution4). What is the definition of random variable 'X' in uniform distribution? X=number of the bits X=number of successful outcomes X=number of bytes X=value of the outcome HintThe X=number of successful outcomes in binomial distribution5). The range of values for X in uniform distribution is _________________ Varies X=0,1,2,.......n X=0,1,2,.......r None of the above HintThe range of values for X in binomial distribution is X=0,1,2,.......n and in hypergeometric distribution is X=0,1,2,.......r6). Which one of the following distributions is bi-parametric? Binomial Poisson Both a and b None of the above HintThe poisson distribution is uniparametric7). Which one of the following is an example for the continuous variable? Exponential distribution Poisson distribution Gaussian distribution Both a and c HintThe Poisson distribution is an example of a discrete variable8). In which one of the following variables the values are obtained by measuring? Continuous Discrete Both a and b None of the above HintIn discrete variables, the values are obtained by counting9). Which one of the following variables is represented by isolated points? Continuous Discrete Both a and b None of the above HintThe continuous variable represented by connected points10). Which one of the following variables is countable? Continuous Discrete Both a and b None of the above HintThe continuous variable is not countable11). Which one of the following is an expression for monomial? 1000 7+Y+5X 5X-4Y None of the above HintIf the number of terms is one then the expression is said to be monomial12). The poles in Chebyshev type-1 filter lie on _____________ in s-plane? Ellipse Circle Both a and b None of the above HintThe poles in the Butterworth filter lie on the circle in s-plane13). What is the meaning of the parameter 'n' in binomial distribution? Number of items Number of trials Size of population None of the above HintThe n=number of items in uniform distribution and n=size of population in hypergeometric distribution14). The range of values for X in binomial distribution is _________________ Varies X=0,1,2,.......n X=0,1,2,.......r None of the above HintThe range of values for X in uniform distribution varies and in hypergeometric distribution is X=0,1,2,.......r15). If the degree of the polynomial is zero then the name of the polynomial is _____________ function? Constant Linear Quadratic Cubic HintThe polynomial degree is zero for constant function16). Which one of the following is an example for a discrete variable? Exponential distribution Poisson distribution Gaussian distribution Both a and c HintThe exponential and Gaussian distributions are examples of continuous variable17). The variable is represented by a letter ____________ in normal distribution? r x r or x None of the above HintThe variable is represented by a letter 'r' in the binomial distribution18). How many outcomes are possible in the Poisson distribution? One Two Three Unlimited HintOnly two outcomes are possible in the binomial distribution19). What is the definition of random variable 'X' in uniform distribution? X=number of the bits X=number of successful outcomes X=number of bytes X=value of the outcome HintThe defination of random variable 'X' in uniform distribution is value of the outcome20). The range of values for X in hypergeometric distribution is _________________ Varies X=0,1,2,.......n X=0,1,2,.......r None of the above HintThe range of values for X in uniform distribution is varies and in binomial distribution is X=0,1,2,.......n21). If x(-t) =-x(t) for all t then the signal is said to be ________ signal? Even Odd Both a and b None of the above HintIf x(-t) =x(t) for all t then the signal is said to be an even signal22). Which one of the following distributions is uni-parametric? Binomial Poisson Both a and b None of the above HintThe binomial distribution is bi-parametric23). In which one of the following distributions the mean is equal to variance? Binomial Poisson Both a and b None of the above HintIn binomial distribution, the mean is greater than the variance24). What is the meaning of the parameter 'n' in hypergeometric distribution? Number of items Number of trials Size of population None of the above HintThe n=number of items in uniform distribution and n=size of trials in the binomial distribution25). If the degree of the polynomial is one then the name of the polynomial is _____________ function? Constant Linear Quadratic Cubic HintThe polynomial degree is one for the linear functionDiscrete-Time Signals and Systems MCQs for Quiz26). The probability formula of uniform distribution is given as _________________ P(X=x)=1/n P=1/n P(X=x)=n P(X=x)=1 HintThe probability formula of uniform distribution is given as P(X=x)=1/n27). The probability formula is ____________________ in hypergeometric distribution? (X=x)=C(a,x)/C(n,r) P(X=x)=C(a,x)C(n-a,r-x) P(X=x)=C(a,x)C(n-a,r-x)/C(n,r) None of the above HintThe probability formula is P(X=x)=C(a,x)C(n-a,r-x)/C(n,r) in hypergeometric distribution28). The Poisson distribution is an example for ______________ variable? Continuous Discrete Both a and b None of the above HintThe exponential distribution is an example for the continuous variable29). If the energy=infinte , and the power=infinte then the signal is said to be ______________ signal? Power Energy Neither power nor energy signal None of the above HintIf the energy=infinte, and the power=finite then the signal is said to be a power signal30). If the degree of the polynomial is two then the name of the polynomial is _____________ function? Constant Linear Quadratic Cubic HintThe polynomial degree is two for quadratic function31). Which one of the following is a figure is a discrete-time signal graphical representation? Figure (a) Figure (b) Figure (c) Figure (d) HintFig (b) is the functional, fig (c) is tabular, and fig (d) is the sequence representation of the discrete-time signal32). The discrete-time systems are described by ______________ equation? Difference Differential Integral None of the above HintThe continuous-time systems are described by the differential equation33). Which one of the following variables is not countable? Continuous Discrete Both a and b None of the above HintThe discrete variable is countable34). The poles in Butterworth filter lie on _____________ in s-plane? Ellipse Circle Both a and b None of the above HintThe poles in Chebyshev type-1 filter lie on the ellipse in s-plane35). In which one of the following the frequency relationship is linear? Impulse invariance Bilinear transformation Both a and b None of the above HintIn bilinear transformation the frequency relationship is non-linear36). The continuous-time systems are described by ____________ equation? Difference Differential Integral None of the above HintThe discrete-time systems are described by difference equation37). In which one of the following variables the values are obtained by counting? Continuous Discrete Both a and b None of the above HintIn continuous variable, the values are obtained by measuring38). If the degree of the polynomial is three then the name of the polynomial is _____________ function? Constant Linear Quadratic Cubic HintThe polynomial degree is three for a cubic function39). What are the advantages of bilinear transformation? Stable design No aliasing Both a and b None of the above HintThe advantages of bilinear transformation is it has a stable design and no aliasing40). In which one of the stability of the following filters cannot be always guaranteed? FIR digital IIR digital Both a and b None of the above HintThe FIR digital filters are always stable41). In binomial distribution the expectation formula is given by _____________ P(X=x)=C(a,x)/C(n,r) E(X)=np P(X=x)=C(a,x)C(n-a,r-x)/C(n,r) None of the above HintIn binomial distribution the expectation formula is given by E(X)=np42). Which one of the following filters has a monotonic response in both bands? Butterworth Chebyshev-I Chebyshev-II None of the above HintThe Chebyshev-I filter have an equiripple response in the passband43). In which one of the following filters the roll-off is very good? Chebyshev Inverse Chebyshev Bessel Both a and b HintIn Bessel filters, the roll of is very poor44). If the degree of the polynomial is four then the name of the polynomial is _____________ function? Constant Linear Quartic Cubic HintThe polynomial degree is four for quartic function45). Which one of the following variables is represented by connected points? Continuous Discrete Both a and b None of the above HintThe discrete variable represented by isolated points46). The discrete-time signals represented in ________________ form? Sequence Functional Tabular All of the above HintThe discrete-time signals are represented in three forms47). _______________ are the examples of singularity functions? Impulse Step and ramp functions Both a and b None of the above HintThe impulse, step, and ramp functions all are examples of singularity functions48). If the energy=infinity, and the power=finite then the signal is said to be ___________ Power Energy Both a and b None of the above HintIf the energy=infinity, and the power=zero then the signal is said to be an energy signal49). Which one of the following figures is a symbol of addition in a discrete-time system? Fig (a) Fig (b) Fig (c) Fig (d) HintThe fig a, b, and d symbols also used in the discrete-time system50). In which one of the following the frequency relationship is non-linear? Impulse invariance Bilinear transformation Both a and b None of the above HintIn impulse invariance the frequency relationship is linearDiscrete-Time Signals and Systems MCQs for Interviews51). In hypergeometric distribution the expectation formula is given by _____________ P(X=x)=C(a,x)/C(n,r) E(X)=np E(X)=ra/n None of the above HintIn hypergeometric distribution, the expectation formula is given by E(X)=ra/n52). The exponential distribution is an example for ______________ variable? Continuous Discrete Both a and b None of the above HintThe Poisson distribution is an example of a discrete variable53). If the degree of the polynomial is five then the name of the polynomial is _____________ function? Constant Linear Quartic Quintic HintThe polynomial degree is five for quintic function54). The type of polynomials are categorized into ______________ types? Two Three Four Five HintThe constant, linear, quadratic, and cubic are a type of polynomials55). The 2,3,5....... are the example of _______________ polynomial? Constant Linear Quadratic Cubic HintThe degree for a constant polynomial is zero56). The 8X^3 is an example of _______________ polynomial? Constant Linear Quadratic Cubic HintThe degree for a cubic polynomial is three57). The y(n)=x(-n) is an example for ______________ system? Stable Unstable Linear None of the above HintThe y(n)=x(-n) is an example of a stable system58). Which principle does the linear system obey? Superposition Ohms law Both a and b None of the above HintThe linear system doesn't obey ohms law59). The voice frequency of time division multiplexing is around ______________ KHz? One Two Three Four HintThe voice frequency of TDM is more than 4KHz60). The sampling rate of TDM is ____________ kilo samples per second? Eight Two Five Four HintThe sampling rate of TDM is not more than 8-kilo samples per second61). How many kilobytes does one voice frequency in TDM requires? 20Kbps 30Kbps 64Kbps 8Kbps HintOne voice frequency in time-division multiplexing requires 64Kbps62). How many Mbps does 32 voice frequencies in TDM require? 2Mbps 30Mbps 64Mbps 8Mbps HintThe 32 voice frequencies in time-division multiplexing requires 2Mbps63). The distributions are categorized into _________________ types? One Two Three Four HintThe continuous and discrete distributions are two types of distributions64). The basic discrete sequences that are frequently originated are _______________ Unit impulse and unit step sequence Sinusoidal sequence Exponential sequence All of the above HintThe basic discrete sequences that are frequently originated are unit impulse, unit step, sinusoidal, and exponential sequences65). Which one of the following figures is a symbol of scaling in a discrete-time system? Fig (a) Fig (b) Fig (c) Fig (d) HintThe fig a, b, and c symbols also used in the discrete-time system66). In which one of the following distributions the trials are independent? Binomial Hypergeometric Both a and b None of the above HintIn hypergeometric distribution the trials are dependent67). If the system y(n)=x(n) then the system is said to be _____________ system? Static Dynamic Either static or dynamic None of the above HintIf the system y(n)=x(n) then the system is said to be a static system68). If the energy=infinity, and the power=zero then the signal is said to be ______________ signal? Power Energy Both a and b None of the above HintIf the energy=infinity, and the power=finite then the signal is said to be a power signal69). The figure shown below is a block diagram of _______________ closed-loop control system? Discrete Continuous Analog None of the above HintThe figure shown above is a block diagram of a discrete closed-loop control system70). Which one of the following is an example of a dynamic system? x(n) A(n-2) x^2(n) None of the above HintThe x(n) and x^2(n) are static system examples71). Which one of the following filters has equiripple response in the passband? Butterworth Chebyshev-I Chebyshev-II None of the above HintThe Chebyshev-II filter have equiripple response in the stopband and the Butterworth filter have the monotonic response in both bands72). The height, weight, skull circumference are examples of _________________ variable? Continuous Discrete Both a and b None of the above HintThe number of daily admissions to a general Hospital is an example of a continuous variable73). Which one of the following figures is a symbol of unit advance in a discrete-time system? Fig (a) Fig (b) Fig (c) Fig (d) HintThe fig a, c, and d symbols are also used in the discrete-time system74). The Gaussian distribution is an example for ______________ variable? Discrete Continuous Both a and b None of the above HintThe binomial distribution is an example for a discrete variable75). If the system y(n) is equal to _______________ then the system is said to be stable system? Cos [x(n)] x(-n+2) X(n) u(n) All of the above HintIf the system y(n)=X(n)+n x(n+1) then the system is said to be unstable systemDiscrete-Time Signals and Systems MCQs for Exams76). If the system y(n) is equal to _______________ then the system is said to be non-causal system? X(n) 2 x(n) X (2n) Both b and c HintIf the system y(n) is equal to X(n) then the system is said to be a causal system77). In which one of the following filters the step response is good? Chebyshev Butterworth Inverse Chebyshev Both b and c HintIn the Chebyshev filter the step response is poor78). In which one of the following filters the roll-off is poor? Chebyshev Butterworth Bessel Both b and c HintIn Chebyshev and Butterworth filters the roll-off is good79). In which one of the following filters the unit sample response is infinite? IIR FIR Both a and b None of the above HintIn the FIR filter the unit sample response is finite80). Which one of the following filters doesn't use feedback? IIR FIR Both a and b None of the above HintThe FIR filter doesn't use feedback whereas the IIR uses the feedback81). If x(-t) =x(t) for all t then the signal is said to be __________________ signal ? Even Odd Both a and b None of the above HintIf x(-t) =-x(t) for all t then the signal is said to be odd signal82). The pass band is flat in ____________________ filter? Butterworth Chebyshev Inverse chebyshev Both a and c HintThe passband is rippled in chebyshev filter83). The figure shown below is a block diagram of _______________ time speed contoller? Discrete Continuous Analog None of the above HintThe figure shown above is a block diagram of the discrete-time speed controller84). Which one of the following is an example of a static system? x(n) A(n-2) x^2(n) Both a and c HintThe A(n-2) is an example of a dynamic system85). The offline systems is an example for _______________ system? Causal Non-causal Both a and b None of the above HintThe real-time digital signal processing system is an example of a causal system Read more about Digital Signal Processing System 86). If the system y(n) is equal to _______________ then the system is said to be causal system? X(n) 2 x(n) X (2n) Both b and c HintIf the system y(n) is equal to X(2n), and 2 x(n) then the system is said to be the non-causal system87). If the system y(n) is equal to _______________ then the system is said to be unstable system? Cos [x(n)] x(-n+2) X(n) u(n) X(n)+n x(n+1) HintIf the system y(n)=cos [x(n)], y(n)=x(-n+2), y(n)=X(n) u(n) then the system is said to be stable system88). In which one of the following distributions the trials are dependent? Binomial Hypergeometric Both a and b None of the above HintIn binomial distribution the trials are independent89). Which one of the following is an example of a linear system? y(n)=x(-n) y(n)=e^x(n) y(n)=m x(n)+c Both a and c HintIf the system y(n)=e^x(n), y(n)=m x(n)+c then the system is said to be non-linear system90). The type of variable is _______________ in binomial distribution? Discrete Continuous Both a and b None of the above HintThe type of variable is continuous in a normal distribution91). Which one of the following is an expression for binomial? X+Y 7+Y+5X 5X-4Y+3XY None of the above HintIf the number of terms is two then it is said to be binomial92). Which one of the following figures is a symbol of unit delay in a discrete-time system? Fig (a) Fig (b) Fig (c) Fig (d) HintThe fig b, c, and d symbols are also used in the discrete-time system93). Which one of the following filters has equiripple response in stopband? Butterworth Chebyshev-I Chebyshev-II None of the above HintThe Chebyshev-I filter have equiripple response in the passband and the Butterworth filter have the monotonic response in both bands94). The real time DSP system is an example for _______________ system? Causal Non-causal Both a and b None of the above HintThe offline system is an example of a non-causal system95). What is the standard form of AFD? Analog Filter Discrete Analog Filter Digital Analog Filter Design None of the above HintThe analog filter is a type of circuit made of resistors, inductors, etc96). In which one of the following filters the step response is poor? Chebyshev Butterworth Inverse Chebyshev None of the above HintIn inverse Chebyshev and Butterworth filter the step response is good97). The stop band is monotonic in ____________________ filter? Butterworth Chebyshev Inverse Chebyshev Both a and b HintThe stopband is rippled in inverse Chebyshev filter98). Which one of the following is an example of the non-linear system? y(n)=x(-n) y(n)=e^x(n) y(n)=m x(n)+c Both b and c HintIf the system y(n)= x(-n) then the system is said to be a linear system99). The variable is represented by a letter ____________ in binomial distribution? r x r or x None of the above HintThe variable is represented by a letter 'x' in a normal distribution100). Which one of the following is an expression for trinomial? X+Y 7+Y+5X 5X-4Y None of the above HintIf the number of terms is three then the expression is said to be trinomial Time is Up! Time's up