11The region of convergence of a Z-transform for a causal sequence is:AInside a circleBOnly the unit circleCThe whole plane alwaysDOutside a circle in the z-planeView AnswerDiscussWorkspaceReportSaveEasy
12The Fourier transform converts a signal from:AThe time domain to the frequency domainBAnalog to digitalCContinuous to discrete onlyDVoltage to currentView AnswerDiscussWorkspaceReportSaveEasy
13What is the fundamental period of x(t) = cos(4πt)?A2 sB0.25 sC4 sD0.5 sView AnswerDiscussWorkspaceReportSaveMedium
14The Fourier series represents a periodic signal as:AA single impulseBA polynomialCA step functionDA sum of sinusoids at multiples of the fundamental frequencyView AnswerDiscussWorkspaceReportSaveEasy
15A system is linear if it satisfies:ACausalityBStabilityCTime invarianceDSuperposition (additivity and homogeneity)View AnswerDiscussWorkspaceReportSaveEasy