Signals & Systems MCQs in Electronics Engineering. Multiple-Choice questions related to Signals & Systems on the topic of Electronics Engineering. These questions will help in various examinations at the school and university levels.

**Signals & Systems MCQs**

**Where is the ROC defined or specified for the signals containing causal as well as anti-causal terms ??**

**a.** Greater than the largest pole

**b.** Less than the smallest pole

**c. Between two poles**

**d.** Cannot be defined

**A Laplace Transform exists when ______ ??**

**A. The function is piece-wise continuous
B. The function is of exponential order
C. The function is piecewise discrete
D. The function is of differential order**

**a. A & B**

**b.** C & D

**c.** A & D

**d.** B & C

**Which property of periodic signal in DTFS gets completely clarified/identified by the equation x (n – n _{0}) ??**

**a.** Conjugation

**b. Time Shifting**

**c.** Frequency Shifting

**d.** Time Reversal

**What is the nature of Fourier’s representation of a discrete & aperiodic signal ??**

**a. Continuous & periodic**

**b.** Discrete & aperiodic

**c.** Continuous & aperiodic

**d.** Discrete & periodic

**Which among the following assertions represents a necessary condition for the existence of Fourier Transform of discrete-time signal (DTFT) ??**

**a. Discrete-Time Signal should be absolutely summable**

**b.** Discrete-Time Signal should be absolutely multipliable

**c.** Discrete-Time Signal should be absolutely integrable

**d.** Discrete-Time Signal should be absolutely differentiable

**MCQs Electronics Engineering**

**What is the possible range of frequency spectrum for discrete-time Fourier series (DTFS) ??**

**a.** 0 to 2π

**b.** -π to +π

**c. Both a & b**

**d.** None of the above

**What is/are the crucial purposes of using the Fourier Transform while analyzing any elementary signals at different frequencies ??**

**a.** Transformation from a time domain to frequency domain

**b.** Plotting of amplitude & phase spectrum

**c. Both a & b**

**d.** None of the above

**Which is/are the mandatory condition/s to get satisfied by the transfer function for the purpose of distortionless transmission ??**

**a.** Amplitude Response should be constant for all frequencies

**b.** The phase should be linear with frequency passing through zero

**c. Both a & b**

**d.** None of the above

**Which among the below assertions is precise in accordance with the effect of time scaling ??**

A : Inverse relationship exists between the time and frequency domain representation of the signal

B : A signal must be necessarily limited in time as well as frequency domains ??

**a. A is true & B is false**

**b.** A is false & B is true

**c.** Both A & B are true

**d.** Both A & B are false

**Which property of Fourier transform gives rise to an additional phase shift of -2π ft _{d} for the generated time delay in the communication system without affecting an amplitude spectrum ??**

**a.** Time Scaling

**b.** Linearity

**c. Time Shifting**

**d.** Duality

**Signals & Systems MCQs**

**Duality Theorem / Property of Fourier Transform states that _________ ??**

**a. The Shape of signal in the time domain & shape of the spectrum can be interchangeable**

**b.** The shape of signal in frequency domain & shape of the spectrum can be interchangeable

**c.** The shape of signal in the time domain & shape of the spectrum can never be interchangeable

**d.** The shape of signal in time domain & shape of the spectrum can never be interchangeable

**Why are the negative & positive phase shifts introduced for positive & negative frequencies respectively in amplitude and phase spectra ??**

**a.** To change the symmetry of the phase spectrum

**b. To maintain the symmetry of the phase spectrum**

**c.** Both a & b

**d.** None of the above

**Which phenomenon occurs due to an increase in the channel bandwidth during the transmission of narrow pulses in order to avoid any intervention of signal distortion ??**

**a.** Compression in time domain

**b.** Expansion in time domain

**c.** Compression in frequency domain

**d. Expansion in the frequency domain**

**As the signalling rate increases, _______ ??**

**a.** Width of each pulse increases

**b. Width of each pulse decreases**

**c.** The width of each pulse remains unaffected

**d.** None of the above

**What does the signaling rate in the digital communication system imply ??**

**a. Number of digital pulses transmitted per second**

**b.** The number of digital pulses transmitted per minute

**c.** The number of digital pulses received per second

**d.** Number of digital pulses received per minute

**Signals & Systems MCQs**

**Which type/s of Fourier Series allow/s to represent the negative frequencies by plotting the double-sided spectrum for the analysis of periodic signals ??**

**a.** Trigonometric Fourier Series

**b.** Polar Fourier Series

**c. Exponential Fourier Series**

**d.** All of the above

**Which kind of frequency spectrum/spectra is/are obtained from the line spectrum of a continuous signal on the basis of the Polar Fourier Series Method ??**

**a.** Continuous in nature

**b. Discrete in nature**

**c.** Sampled in nature

**d.** All of the above

**What does the first term ‘a _{0}‘ in the below-stated expression of a line spectrum indicate ??**

x(t) = a_{0} + a_{1} cos w_{0} t + a_{2} cos2 w_{0}t +……+ b_{1} sin w_{0} t + b_{2 }sin w_{0} t + …..

**a. DC component**

**b.** Fundamental component

**c.** Second harmonic component

**d.** All of the above

**Double-sided phase & amplitude spectra _____ ??**

**a. Possess an odd & even symmetry respectively**

**b.** Possess an even & odd symmetry respectively

**c.** Both possess an odd symmetry

**d.** Both possess an even symmetry

**Which are the only waves that correspond/ support the measurement of phase angle in the line spectra ??**

**a.** Sine waves

**b. Cosine waves**

**c.** Triangular waves

**d.** Square waves

**Signals & Systems MCQs**

**What is the number of samples present in an impulse response called as ??**

**a.** string

**b.** array

**c. length**

**d.** element

** LTI system is said to be an initially relaxed system only if ____ ??**

**a. Zero input produces zero output**

**b.** Zero input produces non-zero output

**c.** Zero input produces an output equal to unity

**d.** None of the above

**Which among the following operations is/are not involved /associated with the computation process of linear convolution ??**

**a.** Folding Operation

**b.** Shifting Operation

**c.** Multiplication Operation

**d. Integration Operation**

**Which is/are the essential condition/s to get satisfied for a recursive system to be linear ??**

**a.** Zero state response should be linear

**b.** Principle of Superposition should be applicable to zero input response

**c.** Total Response of the system should be an addition of zero state & zero input responses

**d. All of the above**

**Which type of system response to its input represents the zero value of its initial condition ??**

**a. Zero state response**

**b.** Zero input response

**c.** Total response

**d.** Natural response

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