WorksheetsDiscrete Fourier Transform
Total questions: 10
Worksheet time: 10mins
DFT is applied to
Infinite sequences
Finite discrete sequences
Continuous infinite signals
Continuous finite sequences
The circular convolution of two sequences in time domain is equivalent to
Multiplication of DFTs of two sequences
Summation of DFTs of two sequences
Difference of DFTs of two sequences
Square of multiplication of DFTs of two sequences
Which of the following relations are true if x(n) is real?
X(ω)=X(-ω)
X(ω)=-X(-ω)
X*(ω)=X(ω)
X*(ω)=X(-ω)
The time system which operates with a continuous time signal and produces a continuous time output signal is
CTF system
DTF System
Time invariant System
Time variant System
The basic properties of DFT includes
1)Linearity
2) Periodicity
3) Circular symmetry
4) Summation
1, 2 and 3 are correct
1, 2 and 4 are correct
1 and 3 are correct
All the four are correct
The Imaginary part of eisx is
sinsx
i sinsx
cossx
cosx
Discrete or continuous data?
Discrete
Continuous
WNk+N/2=?
a) WNk
b) -WNk
c) WN-k
d) None of the mentioned
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
1, 2 and 3 are correct
1 and 2 are correct
1 and 3 are correct
All the four are correct
If x(n) and X(K) are an N-Point DFT pair, then X(k+N)=?
X(-k)
-X(k)
X(K)
None of the above
