Digital Signal Processing MCQs | Digital Signal Processing Multiple Choice Questions and Answers

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Questions
1 The interface between an analog signal and a digital processor is
A A/D converter
B D/A converter
C Modulator
D Demodulator

Answer: A/D converter
2 Roll-off factor is
A The performance of the filter or device
B Aliasing effect
C The bandwidth occupied beyond the Nyquist Bandwidth of the filter
D None of the above

Answer: The bandwidth occupied beyond the Nyquist Bandwidth of the filter
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3 DTFT is the representation of
A Aperiodic Discrete time signals
B Aperiodic continuous signals
C Periodic Discrete time signals
D Periodic continuous signals

Answer: Aperiodic Discrete time signals
4 Frequency selectivity characteristics of DFT refers to
A Ability to convert into discrete signal
B Ability to translate into frequency domain
C Ability to resolve different frequency components from input signal
D None of the above

Answer: Ability to resolve different frequency components from input signal
5 The Cooley–Tukey algorithm of FFT is a
A Split and combine algorithm
B Split and rule algorithm
C Divide and rule algorithm
D Divide and conquer algorithm

Answer: Divide and conquer algorithm
6 DIT algorithm divides the sequence into
A Even and odd samples
B Upper higher and lower spectrum
C Small and large samples
D Positive and negative values

Answer: Even and odd samples
7 In DSP processors, which among the following maintains the track of addresses of input data as well as the coefficients stored in data and program memories?
A Program sequences
B Barrel Shifter
C Data Address Generators (DAGs)
D MAC

Answer: Data Address Generators (DAGs)
8 Decimation is a process in which the sampling rate is __________.
A Reduced
B Unpredictable
C Stable
D Enhanced

Answer: Reduced
9 In tapped delay line filter, the tapped line is also known as ________
A Pick-off node
B Pick-on node
C Pick-up node
D Pick-down node

Answer: Pick-off node
10 Anti-imaging filter with cut-off frequency ωc = π/ I is specifically used _______ upsampling process for the removal of unwanted images.
A After
B At the time of
C Before
D All of the above

Answer: After
11 Which units are generally involved in Multiply and Accumulate (MAC)?
A Accumulator
B Adder
C Multiplier
D All of the above

Answer: All of the above
12 How is the sensitivity of filter coefficient quantization for FIR filters?
A Unpredictable
B High
C Low
D None of these

Answer: Low
13 Which among the following represent/s the characteristic/s of an ideal filter?
A Linear Phase Response
B Zero gain in stop band
C Constant gain in passband
D All of the above

Answer: All of the above
14 FIR filters ________

A. are non-recursive

B. do not adopt any feedback

C. are recursive

D. use feedback

A A & B
B A & D
C C & D
D B & C

Answer: A & B
15 The speech signal is obtained after
A Digital to analog conversion
B Analog to digital conversion
C Quantization
D Modulation

Answer: Digital to analog conversion
16 Telegraph signals are examples of
A Pulse train
B Impulse signals
C Analog signals
D Digital signals

Answer: Digital signals
17 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

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: 1 and 3 are correct
18 The computational procedure for Decimation in frequency algorithm takes
A 2Log2 N stages
B Log2 N2 stages
C Log2 N stages
D None of the above

Answer: Log2 N stages
19 The s plane and z plane are related as
A z = esT/2
B z = 2esT
C z = e2sT
D z = esT

Answer: z = esT
20 The similarity between the Fourier transform and the z transform is that
A Both convert discrete time domain to frequency spectrum domain
B Both convert digital signal to analog signal
C Both convert analog signal to digital signal
D none of the above

Answer: Both convert discrete time domain to frequency spectrum domain

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