# Q & A Signals & Systems: Signals & Systems MCQs

Q & A Signals & Systems. Multiple-Choice Questions on Signals & Systems on advance level. These Multiple-Choice Questions will help in various school and university exams and other online exams on the internet.

## Q & A Signals & Systems

What would be the probability of an event ‘G’ if G denotes its complement, according to the axioms of probability ??

a. P (G) = 1 / P (G)
b. P (G) = 1 – P (G)
c. P (G) = 1 + P (G)
d. P (G) = 1 * P (G)

Mutually Exclusive events ________ ??

a. Contain all sample points
b. Contain all common sample points
c. Does not contain any common sample point
d. Does not contain any sample point

What does each outcome in the sample space regarded as ??

a. Sample point
b. Element
c. Both a & b
d. None of the above

What does the set comprising all possible outcomes of an experiment known as ??

a. Null event
b. Sure event
c. Elementary event
d. None of the above

Where does the maximum value of the autocorrelation function of a power signal occur ??

a. At origin
b. At extremities
c. At unity
d. At infinity

### Q & A Electronics Engineering

Which property is exhibited by the auto-correlation function of a complex-valued signal ??

a. Commutative property
b. Distributive property
c. Conjugate property
d. Associative property

Which function has a provision of determining the similarity between the signal and its delayed version ??

a. Auto-correlation Function
b. Cross-correlation Function
c. Both a & b
d. None of the above

Which among the below-mentioned assertions is/are correct ??

a. Greater the value of correlation function, higher is the similarity level between two signals
b. Greater the value of correlation function, lower is the similarity level between two signals
c. Lesser the value of correlation function, higher is the similarity level between two signals
d. Lesser the value of correlation function, lower is the similarity level between two signals

a. Only C
b. Only B
c. A & D
d. B & C

The ESD of a real valued energy signal is always _________ ??

a. An even (symmetric) function of frequency
b. An odd (non-symmetric) function of frequency
c. A function that is odd and half-wave symmetric
d. None of the above

Which among the below-mentioned transform pairs is/are formed between the auto-correlation function and the energy spectral density, in accordance to the property of Energy Spectral Density (ESD) ??

a. Laplace Transform
b. Z-Transform
c. Fourier Transform
d. All of the above

Q & A Signals & Systems

What does the spectral density function of any signal specify ??

a. Distribution of energy or power
b. Consumption of energy or power
c. Conservation of energy or power
d. Generation of energy or power

According to Rayleigh’s theorem, it becomes possible to determine the energy of a signal by ________ ??

a. Estimating the area under the square root of its amplitude spectrum
b. Estimating the area under the square of its amplitude spectrum
c. Estimating the area under the one-fourth power of its amplitude spectrum
d. Estimating the area exactly half as that of its amplitude spectrum

Which theorem states that the total average power of a periodic signal is equal to the sum of average powers of the individual Fourier coefficients ??

a. Parseval’s Theorem
b. Rayleigh’s Theorem
c. Both a & b
d. None of the above

Correlogram is a graph of ______ ??

a. Amplitude of one signal plotted against the amplitude of another signal
b. Frequency of one signal plotted against the frequency of another signal
c. The amplitude of one signal plotted against the frequency of another signal
d. Frequency of one signal plotted against the time period of another signal

When is the system said to be causal as well as stable in accordance to pole/zero of ROC specified by system transfer function ??

a. Only if all the poles of system transfer function lie in left-half of S-plane
b. Only if all the poles of system transfer function lie in right-half of S-plane
c. Only if all the poles of system transfer function lie at the centre of S-plane
d. None of the above

Q & A Signals & Systems

An impulse response of the system at initially rest condition is basically a response to its input & hence also regarded as ??

a. Black’s function
b. Red’s function
c. Green’s function
d. None of the above

Generally, the convolution process associated with the Laplace Transform in the time domain results into ________ ??

a. Simple multiplication in complex frequency domain
b. Simple division in complex frequency domain
c. Simple multiplication in complex time-domain
d. Simple division in the complex time domain

What should be the location of poles corresponding to ROC for bilateral Inverse Laplace Transform especially for determining the nature of time-domain signal ??

a. On L.H.S of ROC
b. On R.H.S of ROC
c. On both sides of ROC
d. None of the above

Unilateral Laplace Transform is applicable for the determination of linear constant-coefficient differential equations with ________ ??

a. Zero initial condition
b. Non-zero initial condition
c. Zero final condition
d. Non-zero final condition

Which result is generated/ obtained by the addition of a step to a ramp function ??

a. Step Function shifted by an amount equal to ramp
b. Ramp Function shifted by an amount equal to step
c. Ramp function of zero slope
d. Step function of zero slope

Q & A Signals & Systems

According to the time-shifting property of Laplace Transform,  shifting the signal in the time domain corresponds to the ______ ??

a. Multiplication by e-st0 in the time domain
b. Multiplication by e-st0 in the frequency domain
c. Multiplication by est0 in the time domain
d. Multiplication by est0 in the frequency domain

What should be the value of the Laplace transform for the time-domain signal equation e-at cos ωt.u(t) ??

a. 1 / s + a with ROC σ > – a
b. ω / (s + a) 2 + ω2 with ROC σ > – a
c. s + a / (s + a)2 + ω2 with ROC σ > – a
d. Aω / s2 + ω2 with ROC σ > 0