Discrete Time Signal and Systems Question & Answers February 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 Hint 2). In which one of the following distributions the mean is greater than variance? Binomial Poisson Both a and b None of the above Hint 3). What is the meaning of the parameter 'n' in uniform distribution? Number of items Number of trials Size of population None of the above Hint 4). 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 Hint 5). 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 Hint 6). Which one of the following distributions is bi-parametric? Binomial Poisson Both a and b None of the above Hint 7). Which one of the following is an example for the continuous variable? Exponential distribution Poisson distribution Gaussian distribution Both a and c Hint 8). In which one of the following variables the values are obtained by measuring? Continuous Discrete Both a and b None of the above Hint 9). Which one of the following variables is represented by isolated points? Continuous Discrete Both a and b None of the above Hint 10). Which one of the following variables is countable? Continuous Discrete Both a and b None of the above Hint 11). Which one of the following is an expression for monomial? 1000 7+Y+5X 5X-4Y None of the above Hint 12). The poles in Chebyshev type-1 filter lie on _____________ in s-plane? Ellipse Circle Both a and b None of the above Hint 13). What is the meaning of the parameter 'n' in binomial distribution? Number of items Number of trials Size of population None of the above Hint 14). 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 Hint 15). If the degree of the polynomial is zero then the name of the polynomial is _____________ function? Constant Linear Quadratic Cubic Hint 16). Which one of the following is an example for a discrete variable? Exponential distribution Poisson distribution Gaussian distribution Both a and c Hint 17). The variable is represented by a letter ____________ in normal distribution? r x r or x None of the above Hint 18). How many outcomes are possible in the Poisson distribution? One Two Three Unlimited Hint 19). 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 Hint 20). 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 Hint 21). 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 Hint 22). Which one of the following distributions is uni-parametric? Binomial Poisson Both a and b None of the above Hint 23). In which one of the following distributions the mean is equal to variance? Binomial Poisson Both a and b None of the above Hint 24). What is the meaning of the parameter 'n' in hypergeometric distribution? Number of items Number of trials Size of population None of the above Hint 25). If the degree of the polynomial is one then the name of the polynomial is _____________ function? Constant Linear Quadratic Cubic Hint Discrete-Time Signals and Systems MCQs for Quiz 26). 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 Hint 27). 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 Hint 28). The Poisson distribution is an example for ______________ variable? Continuous Discrete Both a and b None of the above Hint 29). 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 Hint 30). If the degree of the polynomial is two then the name of the polynomial is _____________ function? Constant Linear Quadratic Cubic Hint 31). Which one of the following is a figure is a discrete-time signal graphical representation? Figure (a) Figure (b) Figure (c) Figure (d) Hint 32). The discrete-time systems are described by ______________ equation? Difference Differential Integral None of the above Hint 33). Which one of the following variables is not countable? Continuous Discrete Both a and b None of the above Hint 34). The poles in Butterworth filter lie on _____________ in s-plane? Ellipse Circle Both a and b None of the above Hint 35). In which one of the following the frequency relationship is linear? Impulse invariance Bilinear transformation Both a and b None of the above Hint 36). The continuous-time systems are described by ____________ equation? Difference Differential Integral None of the above Hint 37). In which one of the following variables the values are obtained by counting? Continuous Discrete Both a and b None of the above Hint 38). If the degree of the polynomial is three then the name of the polynomial is _____________ function? Constant Linear Quadratic Cubic Hint 39). What are the advantages of bilinear transformation? Stable design No aliasing Both a and b None of the above Hint 40). 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 Hint 41). 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 Hint 42). Which one of the following filters has a monotonic response in both bands? Butterworth Chebyshev-I Chebyshev-II None of the above Hint 43). In which one of the following filters the roll-off is very good? Chebyshev Inverse Chebyshev Bessel Both a and b Hint 44). If the degree of the polynomial is four then the name of the polynomial is _____________ function? Constant Linear Quartic Cubic Hint 45). Which one of the following variables is represented by connected points? Continuous Discrete Both a and b None of the above Hint 46). The discrete-time signals represented in ________________ form? Sequence Functional Tabular All of the above Hint 47). _______________ are the examples of singularity functions? Impulse Step and ramp functions Both a and b None of the above Hint 48). 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 Hint 49). Which one of the following figures is a symbol of addition in a discrete-time system? Fig (a) Fig (b) Fig (c) Fig (d) Hint 50). In which one of the following the frequency relationship is non-linear? Impulse invariance Bilinear transformation Both a and b None of the above Hint Discrete-Time Signals and Systems MCQs for Interviews 51). 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 Hint 52). The exponential distribution is an example for ______________ variable? Continuous Discrete Both a and b None of the above Hint 53). If the degree of the polynomial is five then the name of the polynomial is _____________ function? Constant Linear Quartic Quintic Hint 54). The type of polynomials are categorized into ______________ types? Two Three Four Five Hint 55). The 2,3,5....... are the example of _______________ polynomial? Constant Linear Quadratic Cubic Hint 56). The 8X^3 is an example of _______________ polynomial? Constant Linear Quadratic Cubic Hint 57). The y(n)=x(-n) is an example for ______________ system? Stable Unstable Linear None of the above Hint 58). Which principle does the linear system obey? Superposition Ohms law Both a and b None of the above Hint 59). The voice frequency of time division multiplexing is around ______________ KHz? One Two Three Four Hint 60). The sampling rate of TDM is ____________ kilo samples per second? Eight Two Five Four Hint 61). How many kilobytes does one voice frequency in TDM requires? 20Kbps 30Kbps 64Kbps 8Kbps Hint 62). How many Mbps does 32 voice frequencies in TDM require? 2Mbps 30Mbps 64Mbps 8Mbps Hint 63). The distributions are categorized into _________________ types? One Two Three Four Hint 64). The basic discrete sequences that are frequently originated are _______________ Unit impulse and unit step sequence Sinusoidal sequence Exponential sequence All of the above Hint 65). Which one of the following figures is a symbol of scaling in a discrete-time system? Fig (a) Fig (b) Fig (c) Fig (d) Hint 66). In which one of the following distributions the trials are independent? Binomial Hypergeometric Both a and b None of the above Hint 67). 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 Hint 68). 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 Hint 69). The figure shown below is a block diagram of _______________ closed-loop control system? Discrete Continuous Analog None of the above Hint 70). Which one of the following is an example of a dynamic system? x(n) A(n-2) x^2(n) None of the above Hint 71). Which one of the following filters has equiripple response in the passband? Butterworth Chebyshev-I Chebyshev-II None of the above Hint 72). The height, weight, skull circumference are examples of _________________ variable? Continuous Discrete Both a and b None of the above Hint 73). 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) Hint 74). The Gaussian distribution is an example for ______________ variable? Discrete Continuous Both a and b None of the above Hint 75). 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 Hint Discrete-Time Signals and Systems MCQs for Exams 76). 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 Hint 77). In which one of the following filters the step response is good? Chebyshev Butterworth Inverse Chebyshev Both b and c Hint 78). In which one of the following filters the roll-off is poor? Chebyshev Butterworth Bessel Both b and c Hint 79). In which one of the following filters the unit sample response is infinite? IIR FIR Both a and b None of the above Hint 80). Which one of the following filters doesn't use feedback? IIR FIR Both a and b None of the above Hint 81). 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 Hint 82). The pass band is flat in ____________________ filter? Butterworth Chebyshev Inverse chebyshev Both a and c Hint 83). The figure shown below is a block diagram of _______________ time speed contoller? Discrete Continuous Analog None of the above Hint 84). Which one of the following is an example of a static system? x(n) A(n-2) x^2(n) Both a and c Hint 85). The offline systems is an example for _______________ system? Causal Non-causal Both a and b None of the above Hint 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 Hint 87). 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) Hint 88). In which one of the following distributions the trials are dependent? Binomial Hypergeometric Both a and b None of the above Hint 89). 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 Hint 90). The type of variable is _______________ in binomial distribution? Discrete Continuous Both a and b None of the above Hint 91). Which one of the following is an expression for binomial? X+Y 7+Y+5X 5X-4Y+3XY None of the above Hint 92). 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) Hint 93). Which one of the following filters has equiripple response in stopband? Butterworth Chebyshev-I Chebyshev-II None of the above Hint 94). The real time DSP system is an example for _______________ system? Causal Non-causal Both a and b None of the above Hint 95). What is the standard form of AFD? Analog Filter Discrete Analog Filter Digital Analog Filter Design None of the above Hint 96). In which one of the following filters the step response is poor? Chebyshev Butterworth Inverse Chebyshev None of the above Hint 97). The stop band is monotonic in ____________________ filter? Butterworth Chebyshev Inverse Chebyshev Both a and b Hint 98). 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 Hint 99). The variable is represented by a letter ____________ in binomial distribution? r x r or x None of the above Hint 100). Which one of the following is an expression for trinomial? X+Y 7+Y+5X 5X-4Y None of the above Hint Time is Up! Time's up
