# Discrete Fourier Transform (DFT) - Electronic Engineering (MCQ) questions & answers

1)   The filtering is performed using DFT using

1) Limited size or blocks of data
2) Small memory size
3) Large memory size
4) Large segments of data

a. 1, 2 and 3 are correct
b. 3 and 4 are correct
c. 1 and 2 are correct
d. All the four are correct
 Answer  Explanation ANSWER: 1 and 2 are correct Explanation: No explanation is available for this question!

2)   DFT is applied to

a. Infinite sequences
b. Finite discrete sequences
c. Continuous infinite signals
d. Continuous finite sequences
 Answer  Explanation ANSWER: Finite discrete sequences Explanation: No explanation is available for this question!

3)   The circular convolution of two sequences in time domain is equivalent  to

a. Multiplication of DFTs of two sequences
b. Summation of DFTs of two sequences
c. Difference of DFTs of two sequences
d. Square of multiplication of DFTs of two sequences
 Answer  Explanation ANSWER: Multiplication of DFTs of two sequences Explanation: No explanation is available for this question!

4)   Circular shift of an N point is equivalent to

a. Circular shift of its periodic extension and its vice versa
b. Linear shift of its periodic extension and its vice versa
c. Circular shift of its aperiodic extension and its vice versa
d. Linear shift of its aperiodic extension and its vice versa
 Answer  Explanation ANSWER: Linear shift of its periodic extension and its vice versa Explanation: No explanation is available for this question!

5)   Padding of zeros increases the frequency resolution.

a. True
b. False

 Answer  Explanation ANSWER: False Explanation: No explanation is available for this question!

6)   The basic properties of DFT includes

1) Linearity
2) Periodicity
3) Circular symmetry
4) Summation

a. 1, 2 and 3 are correct
b. 1, 2 and 4 are correct
c. 1 and 3 are correct
d. All the four are correct
 Answer  Explanation ANSWER: 1, 2 and 3 are correct Explanation: No explanation is available for this question!

7)   Frequency selectivity characteristics of DFT refers to

a. Ability to resolve different frequency components from input signal
b. Ability to translate into frequency domain
c. Ability to convert into discrete signal
d. None of the above
 Answer  Explanation ANSWER: Ability to resolve different frequency components from input signal Explanation: No explanation is available for this question!

8)   The DFT is preferred for

1) Its ability to determine the frequency component of the signal
2) Removal of noise
3) Filter design
4) Quantization of signal

a. 1, 2 and 3 are correct
b. 1 and 2 are correct
c. 1 and 3 are correct
d. All the four are correct
 Answer  Explanation ANSWER: 1 and 3 are correct Explanation: No explanation is available for this question!

9)   The transforming relations performed by DTFT are

1) Linearity
2) Modulation
3) Shifting
4) Convolution

a. 1, 2 and 3 are correct
b. 1 and 2 are correct
c. 1 and 3 are correct
d. All the four are correct
 Answer  Explanation ANSWER: All the four are correct Explanation: No explanation is available for this question!

10)   DTFT is the representation of

a. Periodic Discrete time signals
b. Aperiodic Discrete time signals
c. Aperiodic continuous signals
d. Periodic continuous signals
 Answer  Explanation ANSWER: Aperiodic Discrete time signals Explanation: No explanation is available for this question!