# Signals & Systems MCQs: Electronics Engineering MCQ

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 – n0) ??

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 ftd 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 ‘a0‘ in the below-stated expression of a line spectrum indicate ??

x(t) = a0 + a1 cos w0 t + a2 cos2 w0t +……+  b1 sin w0 t + b2 sin w0 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