SIGNAL AND SYSTEM MCQS SET 04

SIGNAL AND SYSTEM MCQS SET 04

1)   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
ANSWER: (c) Time Shifting
 

2)   Which among the below assertions is precise in accordance to the effect of time scaling?
A : Inverse relationship exists between the time and frequency domain representation of 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
ANSWER: (a)A is true & B is false
 

3)   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. Phase should be linear with frequency passing through zero
c. Both a & b
d. None of the above
ANSWER: (c)Both a & b
 

4)   What is/are the crucial purposes of using the Fourier Transform while analyzing any elementary signals at different frequencies?
a. Transformation from time domain to frequency domain
b. Plotting of amplitude & phase spectrum
c. Both a & b
d. None of the above
ANSWER:  (c)Both a & b
 

5)   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 

ANSWER: (c)Both a & b
 

6)   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
ANSWER: (a)Discrete Time Signal should be absolutely summable
 

7)   What is the nature of Fourier representation of a discrete &  aperiodic signal?
a. Continuous & periodic                 b. Discrete & aperiodic
c. Continuous & aperiodic              d. Discrete & periodic
ANSWER: (a) Continuous & periodic
 

8)   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
ANSWER:  (b) Time Shifting
 

9)   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
ANSWER: (a) A & B
 

10)   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
ANSWER: (c) Between two poles