SIGNAL AND SYSTEM MCQS SET 03

SIGNAL AND SYSTEM MCQS SET 03

1)   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
ANSWER: (b) Cosine waves
 

2)   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
ANSWER: (a) Possess an odd & even symmetry respectively
 

3)   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
ANSWER: (a) DC component
 

4)   Which kind of frequency spectrum/spectra is/are obtained from the line spectrum of a continuous signal on the basis of Polar Fourier Series Method?
a. Continuous in nature              b. Discrete in nature
c. Sampled in nature                 d. All of the above
ANSWER: (b) Discrete in nature
 

5)   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
ANSWER: (c) Exponential Fourier Series
 

6)   What does the signalling rate in the digital communication system imply?
a. Number of digital pulses transmitted per second
b. Number of digital pulses transmitted per minute
c. Number of digital pulses received per second
d. Number of digital pulses received per minute
ANSWER: (a)Number of digital pulses transmitted per second
 

7)   As the signalling rate increases, _______
a. Width of each pulse increases
b. Width of each pulse decreases
c. Width of each pulse remains unaffected
d. None of the above
ANSWER:  (b)Width of each pulse decreases
 

8)   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 frequency domain
ANSWER: (d)Expansion in frequency domain
 

9)   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
ANSWER: (b) To maintain the symmetry of the phase spectrum
 

10)   Duality Theorem / Property of Fourier Transform states that _________
a. Shape of signal in time domain & shape of spectrum can be interchangeable
b. Shape of signal in frequency domain & shape of spectrum can be interchangeable
c. Shape of signal in time domain & shape of spectrum can never be interchangeable
d. Shape of signal in time domain & shape of spectrum can never be interchangeable
ANSWER: (a) Shape of signal in time domain & shape of spectrum can be interchangeable