WorksheetsEC8553_DTSP::Unit-1/Weekly Quiz-1
Total questions: 20
Worksheet time: 20mins
DFT is applied to
Infinite sequences
Finite discrete sequences
Continuous infinite signals
Continuous finite sequences
If X(k) is the N point DFT of a sequence whose Fourier series coefficients is given by ck, then which of the following is true?
X(k)=N.ck
X(k)=ck/N
X(k)=N/ck
None of the above
If W4100 = Wx200 then what is the value of x?
2
4
8
16
Telegraph signals are examples of
Digital signals
Analog signals
Impulse signals
Pulse train
As compared to the analog systems, the digital processing of signals allow
1) Programmable operations
2) Flexibility in the system design
3) Cheaper systems
4) More reliability
1, 2 and 3 are correct
1 and 2 are correct
1, 2 and 4 are correct
All the four are correct
The Nyquist theorem for sampling
1) Relates the conditions in time domain and frequency domain
2) Helps in quantization
3) Limits the bandwidth requirement
4) Gives the spectrum of the signal
1, 2 and 3 are correct
1 and 2 are correct
1 and 3 are correct
All the four are correct
A discrete time signal may be
1) Samples of a continuous signal
2) A time series which is a domain of integers
3) Time series of sequence of quantities
4) Amplitude modulated wave
1, 2 and 3 are correct
1 and 2 are correct
1 and 3 are correct
All the four are correct
DTFT is the representation of
Periodic Discrete time signals
Aperiodic Discrete time signals
Aperiodic continuous signals
Periodic continuous signals
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
Frequency selectivity characteristics of DFT refers to
Ability to resolve different frequency components from input signal
Ability to translate into frequency domain
Ability to convert into discrete signal
None of the above
The transformations are required for
1) Analysis in time or frequency domain
2) Quantization
3) Easier operations
4) Modulation
1, 2 and 3 are correct
1 and 2 are correct
1 and 3 are correct
All the four are correct
The similarity between the Fourier transform and the z transform is that
Both convert frequency spectrum domain to discrete time domain
Both convert discrete time domain to frequency spectrum domain
Both convert analog signal to digital signal
Both convert digital signal to analog signal
The interface between an analog signal and a digital processor is
D/A converter
A/D converter
Modulator
Demodulator
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
Circular shift of an N point is equivalent to
Circular shift of its periodic extension and its vice versa
Linear shift of its periodic extension and its vice versa
Circular shift of its aperiodic extension and its vice versa
Linear shift of its aperiodic extension and its vice versa
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
The condition for a system to be causal is
All poles of its transfer function must be left half of s-plane
All poles of its transfer function must be right half of s-plane
All zeros of its transfer function must be right half of s-plane
All zeros of its transfer function must be left half of s-plane
The condition for a system to be stable is
All poles of its transfer function lie on the left half of s-plane
All poles of its transfer function must be right half of s-plane
All zeros of its transfer function must be right half of s-plane
All zeros of its transfer function must be left half of s-plane
In general, a digital system designer has better control of tolerances in a digital signal processing system than an analog system designer who is designing an equivalent analog system.
True
False
What is the configuration of system for digital processing of an analog signal?
Analog signal->Pre-filter ->D/A Converter -> Digital Processor -> A/D Converter -> Post-filter
Analog signal-> Pre-filter ->A/D Converter -> Digital Processor -> D/A Converter -> Post-filter
Analog signal-> Post-filter ->D/A Converter -> Digital Processor -> A/D Converter -> Pre-filter
None of the above
