# DTFS And DTFT - MCQs with answers

## DTFS And DTFT - MCQs with answers

1. 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

2. 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

ANSWER: c. Both a & b

3. 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

4. What is the nature of Fourier representation of a discrete & aperiodic signal?

a. Continuous & periodic
b. Discrete and aperiodic
c. Continuous & aperiodic
d. Discrete & periodic

5. 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