Related InterviewSolutions

• Phase margin is always positive for stable feedback system?(a) True(b) FalseI had been asked this question in a job interview.The doubt is from Compensation Techniques topic in section Digital Control Systems of Control Systems
• The given characteristic equation s^4+s^3+2s^2+2s+3=0has:(a) Zero root in the s-plane(b) One root in the RHS of s-plane(c) Two root in the RHS of s-plane(d) Three root in the RHS of s-planeThis question was posed to me in quiz.Question is from Stability Analysis in division Digital Control Systems of Control Systems
• The DFT of a signal x(n) of length N is X(k). When X(k) is given and x(n) is computed from it, the length of x(n)(a) Is increased to infinity(b) Remains N(c) Becomes 2N – 1(d) Becomes N2The question was asked during an interview.The query is from The Z-transform Analysis of Sampled-Data Control Systems in section Digital Control Systems of Control Systems
• The signal is reconstructed back with the help of(a) Zero order hold circuits(b) Extrapolations(c) Signal is reconstructed with zero order holds and extrapolations(d) Signal is not reconstructedThe question was asked during an online exam.Question is taken from Signal Reconstruction in portion Digital Control Systems of Control Systems
• Homogeneous solution of: y(n) -9/16y(n-2) = x(n-1)(a) C1(3/4)^n+C2(3/4)^-n(b) C1-(3/4)^n-1+C2(3/4)^n-1(c) C1(3/4)^n(d) C1-(3/4)^nI got this question in semester exam.My question is from The inverse z-transform and Response of Linear Discrete Systrems topic in chapter Digital Control Systems of Control Systems
• Sampling is necessary :(a) In complex control systems(b) Where high accuracy is required(c) Non automated control systems(d) Automated control systemI got this question in a job interview.My query is from Signal Reconstruction topic in section Digital Control Systems of Control Systems
• Increased pulse-width in the flat-top sampling leads to:(a) Attenuation of high frequencies in reproduction(b) Attenuation of low frequencies in reproduction(c) Greater aliasing errors in reproduction(d) No harmful effects in reproductionThe question was asked during a job interview.This question is from Spectrum Analysis of Sampling Process in chapter Digital Control Systems of Control Systems
• Convolution is used to find:(a) The impulse response of an LTI System(b) Frequency response of a System(c) The time response of a LTI system(d) The phase response of a LTI systemThis question was addressed to me in quiz.My query is from The Z-transform Analysis of Sampled-Data Control Systems in division Digital Control Systems of Control Systems
• If the z transform of x(n) is X(z) =z(8z-7)/4z^2-7z+3, then the final value theorem is :(a) 1(b) 2(c) ∞(d) 0I got this question in an interview.This question is from The inverse z-transform and Response of Linear Discrete Systrems topic in section Digital Control Systems of Control Systems
• Which one of the following rules determine the mapping of s-plane to z-plane?(a) Right side of the s-plane maps into outside of the unit circle in z-plane(b) Left half of s-plane maps into inside of the unit circle(c) Imaginary axis in s-plane maps into the circumference of the unit circle(d) All of the mentionedI have been asked this question in homework.I'd like to ask this question from The Z-Transfer Function topic in division Digital Control Systems of Control Systems