48 + Mcqs in Digital Signal Processing Page 1 McqOptions

1.	The Nyquist theorem for sampling1) Relates the conditions in time domain and frequency domain2) Helps in quantization3) Limits the bandwidth requirement4) 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» D. All the four are correct

Discussion

2.	FFT may be used to calculate1) DFT2) IDFT3) Direct Z transform4) In direct Z transform
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» C. 1 and 3 are correct

Discussion

3.	Telegraph signals are examples of
A.	Digital signals
B.	Analog signals
C.	Impulse signals
D.	Pulse train
Answer» B. Analog signals

Discussion

4.	As compared to the analog systems, the digital processing of signals allow1) Programmable operations2) Flexibility in the system design3) Cheaper systems4) More reliability
A.	1, 2 and 3 are correct
B.	1 and 2 are correct
C.	1, 2 and 4 are correct
D.	All the four are correct
Answer» E.

Discussion

5.	The Cooley Tukeyalgorithm of FFT is a
A.	Divide and conquer algorithm
B.	Divide and rule algorithm
C.	Split and rule algorithm
D.	Split and combine algorithm
Answer» B. Divide and rule algorithm

Discussion

6.	A discrete time signal may be1) Samples of a continuous signal2) A time series which is a domain of integers3) Time series of sequence of quantities4) Amplitude modulated wave
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» B. 1 and 2 are correct

Discussion

7.	The transforming relations performed by DTFT are1) Linearity2) Modulation3) Shifting4) 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» E.

Discussion

8.	The computational procedure for Decimation in frequency algorithm takes
A.	Log2 N stages
B.	2Log2 N stages
C.	Log2 N
D.	Log2 N/2 stages
Answer» B. 2Log2 N stages

Discussion

9.	The DFT is preferred for1) Its ability to determine the frequency component of the signal2) Removal of noise3) Filter design4) 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» D. All the four are correct

Discussion

10.	The transformations are required for1) Analysis in time or frequency domain2) Quantization 3) Easier operations4) Modulation
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» D. All the four are correct

Discussion

11.	The several ways to perform an inverse Z transform are1) Direct computation2) Long division3) Partial fraction expansion with table lookup4) Direct inversion
A.	1, 2 and 3 are correct
B.	1 and 2 are correct
C.	2 and 3 are correct
D.	All the four are correct
Answer» E.

Discussion

12.	The s plane and z plane are related as
A.	z = e
B.	z = e
C.	z = 2e
D.	z = e
Answer» B. z = e

Discussion

13.	The region of convergence of x/ (1+2x+x) is
A.	0
B.	1
C.	Negative
D.	Positive
Answer» C. Negative

Discussion

14.	IIR filter design by approximation of derivatives has the limitations1) Used only for transforming analog high pass filters2) Used for band pass filters having smaller reso t frequencies3) Used only for transforming analog low pass filters4) Used for band pass filters having high reso t frequencies
A.	1, 2 and 3 are correct
B.	1 and 2 are correct
C.	2 and 3 are correct
D.	All the four are correct
Answer» D. All the four are correct

Discussion

15.	The filter that may not be realized by approximation of derivatives techniques are1) Band pass filters2) High pass filters3) Low pass filters4) Band reject filters
A.	1, 2 and 3 are correct
B.	2 and 4 are correct
C.	2 and 3 are correct
D.	All the four are correct
Answer» C. 2 and 3 are correct

Discussion

16.	FIR filters ________A. are non-recursiveB. do not adopt any feedbackC. are recursiveD. use feedback
A.	A & B
B.	C & D
C.	A & D
D.	B & C
Answer» B. C & D

Discussion

17.	In direct form for realisation of IIR filters,1) Denominator coefficients are the multipliers in the feed forward paths2) Multipliers in the feedback paths are the positives of the denominator coefficients3) Numerator coefficients are the multipliers in the feed forward paths4) Multipliers in the feedback paths are the negatives of the denominator coefficients
A.	1, 2 and 3 are correct
B.	1 and 2 are correct
C.	3 and 4 are correct
D.	All the four are correct
Answer» D. All the four are correct

Discussion

18.	The direct form II for realisation involves1) The realisation of transfer function into two parts2) Realisation after fraction3) Product of two transfer functions4) Addition of two transfer functions
A.	1, 2 and 3 are correct
B.	1 and 3 are correct
C.	3 and 4 are correct
D.	All the four are correct
Answer» C. 3 and 4 are correct

Discussion

19.	The cascade realisation of IIR systems involves1) The transfer function broken into product of transfer functions2) The transfer function divided into addition of transfer functions3) Factoring the numerator and denominator polynomials4) Derivatives of the transfer functions
A.	1, 2 and 3 are correct
B.	1 and 3 are correct
C.	3 and 4 are correct
D.	All the four are correct
Answer» C. 3 and 4 are correct

Discussion

20.	The advantage of using the cascade form of realisation is1) It has same number of poles and zeros as that of individual components2) The number of poles is the product of poles of individual components3) The number of zeros is the product of poles of individual components4) Over all transfer function may be determined
A.	1, 2 and 3 are correct
B.	1 and 3 are correct
C.	1 and 4 are correct
D.	All the four are correct
Answer» D. All the four are correct

Discussion

21.	The scaling of a sequence x[n] by a factor is given by
A.	y[n] = [x[n]]
B.	y[n] = x[n
C.	y[n] = x[n]
D.	y[n] = x[n]x[-n]
Answer» D. y[n] = x[n]x[-n]

Discussion

22.	Superposition of signals in a linear system refers to the
A.	Output that is product of all the signals
B.	Output that is sum of all the signals
C.	Output that is of highest amplitude of all the signals
D.	Output that is of largest spectrum of all the signals
Answer» C. Output that is of highest amplitude of all the signals

Discussion

23.	The filtering is performed using DFT using1) Limited size or blocks of data2) Small memory size3) Large memory size4) 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» D. All the four are correct

Discussion

24.	In Overlap-Add Method with linear convolution of a discrete-time signal of length L and a discrete-time signal of length M, for a length N, zero padding should be of length
A.	L, M > N
B.	L, M = N
C.	L, M < N
D.	L, M < N
Answer» D. L, M < N

Discussion

25.	Correlation is used for1) Computation of average power in waveforms2) Climatography3) Identification of binary code word in PCM systems4) Quantization
A.	1, 2 and 3 are correct
B.	1 and 2 are correct
C.	2 and 3 are correct
D.	All the four are correct
Answer» B. 1 and 2 are correct

Discussion

26.	The Chebyshev filters have1) Flat pass band2) Flat stop band3) Equiripple pass band4) Tapering stop band
A.	1 and 2 are correct
B.	2 and 4 are correct
C.	2 and 3 are correct
D.	All the four are correct
Answer» D. All the four are correct

Discussion

27.	The Elliptic filters have1) Flat pass band2) Flat stop band3) Equiripple pass band4) Equiripple stop band
A.	1 and 2 are correct
B.	3 and 4 are correct
C.	2 and 3 are correct
D.	All the four are correct
Answer» C. 2 and 3 are correct

Discussion

28.	The effects caused due to finite word lengths are1) Coefficient quantization error2) Adder overflow limit cycle3) Round off noise4) Limit cycles
A.	1, 2 and 3 are correct
B.	1 and 3 are correct
C.	1 and 4 are correct
D.	All the four are correct
Answer» E.

Discussion

29.	For a linear phase filter, if Z is zero then what would be the value of Z or 1/ Z?
A.	Zero
B.	Unity
C.	Infinity
D.	Unpredictable
Answer» B. Unity

Discussion

30.	In Gibb's phenomenon, the ringing effect is predomi tly present near the ______ .
A.	bandgap
B.	bandedge
C.	bandwidth
D.	bandshell
Answer» C. bandwidth

Discussion

31.	The operations that may be performed on vectors in Euclidean Space are1) Inner product, distance between vectors2) Norm of a vector, orthogonal vectors3) Orthonormal functions4) Vector division
A.	1, 2 and 3 are correct
B.	1 and 2 are correct
C.	1, 2 and 4 are correct
D.	All the four are correct
Answer» B. 1 and 2 are correct

Discussion

32.	A signal x[n] is anti symmetric or odd when
A.	x[-n] = x[n] x[n]
B.	x[n] = -x[n]
C.	x[n] = [x[n]]
D.	x[-n] = -x[n]
Answer» E.

Discussion

33.	The basic properties of DFT includes1) Linearity2) Periodicity3) Circular symmetry4) 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» B. 1, 2 and 4 are correct

Discussion

34.	For the calculation of N- point DFT, Radix -2 FFT algorithm repeats
A.	2(N Log2 N) stages
B.	(N Log2 N)
C.	(N Log2 N)/2 stages
D.	(N Log2(2 N))/2 stages
Answer» D. (N Log2(2 N))/2 stages

Discussion

35.	The circular convolution of two sequences in time domain is equivalentto
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» B. Summation of DFTs of two sequences

Discussion

36.	For a partial fraction method to be followed,1) The degree of the numerator must be more than the degree of the denominator.2) The factors formed for partial fraction are a combination of Linear factors and Irreducible quadratic factors.3) The degree of the numerator must be less than the degree of the denominator.4) The factors formed for partial fraction are a combination of Linear factors and Square roots.
A.	1, 2 and 3 are correct
B.	1 and 2 are correct
C.	2 and 3 are correct
D.	All the four are correct
Answer» D. All the four are correct

Discussion

37.	The transformation technique in which there is one to one mapping from s-domain to z-domain is
A.	Approximation of derivatives
B.	Impulse invariance method
C.	Bilinear transformation method
D.	Backward difference for the derivative
Answer» D. Backward difference for the derivative

Discussion

38.	The frequency warping is referred as1) lower frequencies in analog domain expanded in digital domain2) lower frequencies in digital domain expanded in analog domain3) non linear mapping4) compression of higher frequencies
A.	1, 3 and 4 are correct
B.	2 and 4 are correct
C.	2 and 3 are correct
D.	All the four are correct
Answer» B. 2 and 4 are correct

Discussion

39.	The magnitude response of Butterworth filter has1) Flat stop band2) Flat pass band3) Tapering pass band4) Tapering stop band
A.	1 and 2 are correct
B.	2 and 4 are correct
C.	2 and 3 are correct
D.	All the four are correct
Answer» B. 2 and 4 are correct

Discussion

40.	In the cascaded form of realisation, the polynomials are factored into
A.	a product of 1st-order and 2nd-order polynomials
B.	a product of 2nd-order and 3rd-order polynomials
C.	a sum of 1st-order and 2nd-order polynomials
D.	a sum of 2nd-order and 3rd-order polynomials
Answer» B. a product of 2nd-order and 3rd-order polynomials

Discussion

41.	Parallel form of realisation is done in
A.	High speed filtering applications
B.	Low speed filtering applications
C.	Both a and b
D.	None of the above
Answer» B. Low speed filtering applications

Discussion

42.	A partial-fraction expansion of the transfer function in Z leads to
A.	The parallel form II structure
B.	The parallel form I structure
C.	Cascaded structure
D.	None of the above
Answer» C. Cascaded structure

Discussion

43.	The factors formed for partial fraction are a combination of1) Linear factors2) Irreducible quadratic factors3) Square roots4) Cube roots
A.	1, 2 and 3 are correct
B.	1 and 2 are correct
C.	2 and 3 are correct
D.	All the four are correct
Answer» C. 2 and 3 are correct

Discussion

44.	For designing a multirate LPF with passband 0 to 50 Hz, stopband 60 to 280 Hz, stopband deviation 0.001, passband deviation 0.01 and sampling frequency (f) = 400 Hz, what would be the value of normalized transition width?
A.	0.025 Hz
B.	1.25 Hz
C.	1.50 Hz
D.	2.6 Hz
Answer» B. 1.25 Hz

Discussion

45.	Consider the assertions (steps) given below. Which among the following is a correct sequence of designing steps for the sampling rate converters?A. Computation of decimation/interpolation factor for each stage. B. Clarification of anti-aliasing / anti-imaging filter requirements.C. Designing of filter at each stage.D. Calculation of optimum stages of decimation/ interpolation yielding maximum efficient implementation.
A.	A, B, C, D
B.	C, A, D, B
C.	D, A, B, C
D.	B, D, A, C
Answer» E.

Discussion

46.	How is the sampling rate conversion achieved by factor I/D?
A.	By increase in the sampling rate with (I)
B.	By filtering the sequence to remove unwanted images of spectra of original signal
C.	By decimation of filtered signal with factor D
D.	All of the above
Answer» E.

Discussion

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

Discussion

48.	In TMS 320 C6x processor architecture, which functional unit is adopted for transferring the data from register to and from control register?
A.	L
B.	M
C.	S
D.	D
Answer» D. D

Discussion

Explore topic-wise MCQs in Electronic Engineering (MCQ) questions & answers.

The Nyquist theorem for sampling1) Relates the conditions in time domain and frequency domain2) Helps in quantization3) Limits the bandwidth requirement4) Gives the spectrum of the signal

FFT may be used to calculate1) DFT2) IDFT3) Direct Z transform4) In direct Z transform

Telegraph signals are examples of

As compared to the analog systems, the digital processing of signals allow1) Programmable operations2) Flexibility in the system design3) Cheaper systems4) More reliability

The Cooley Tukeyalgorithm of FFT is a

A discrete time signal may be1) Samples of a continuous signal2) A time series which is a domain of integers3) Time series of sequence of quantities4) Amplitude modulated wave

The transforming relations performed by DTFT are1) Linearity2) Modulation3) Shifting4) Convolution

The computational procedure for Decimation in frequency algorithm takes

The DFT is preferred for1) Its ability to determine the frequency component of the signal2) Removal of noise3) Filter design4) Quantization of signal

The transformations are required for1) Analysis in time or frequency domain2) Quantization 3) Easier operations4) Modulation

The several ways to perform an inverse Z transform are1) Direct computation2) Long division3) Partial fraction expansion with table lookup4) Direct inversion

The s plane and z plane are related as

The region of convergence of x/ (1+2x+x) is

IIR filter design by approximation of derivatives has the limitations1) Used only for transforming analog high pass filters2) Used for band pass filters having smaller reso t frequencies3) Used only for transforming analog low pass filters4) Used for band pass filters having high reso t frequencies

The filter that may not be realized by approximation of derivatives techniques are1) Band pass filters2) High pass filters3) Low pass filters4) Band reject filters

FIR filters ________A. are non-recursiveB. do not adopt any feedbackC. are recursiveD. use feedback

The direct form II for realisation involves1) The realisation of transfer function into two parts2) Realisation after fraction3) Product of two transfer functions4) Addition of two transfer functions

The cascade realisation of IIR systems involves1) The transfer function broken into product of transfer functions2) The transfer function divided into addition of transfer functions3) Factoring the numerator and denominator polynomials4) Derivatives of the transfer functions

The scaling of a sequence x[n] by a factor is given by

Superposition of signals in a linear system refers to the

The filtering is performed using DFT using1) Limited size or blocks of data2) Small memory size3) Large memory size4) Large segments of data

In Overlap-Add Method with linear convolution of a discrete-time signal of length L and a discrete-time signal of length M, for a length N, zero padding should be of length

Correlation is used for1) Computation of average power in waveforms2) Climatography3) Identification of binary code word in PCM systems4) Quantization

The Chebyshev filters have1) Flat pass band2) Flat stop band3) Equiripple pass band4) Tapering stop band

The Elliptic filters have1) Flat pass band2) Flat stop band3) Equiripple pass band4) Equiripple stop band

The effects caused due to finite word lengths are1) Coefficient quantization error2) Adder overflow limit cycle3) Round off noise4) Limit cycles

For a linear phase filter, if Z is zero then what would be the value of Z or 1/ Z?

In Gibb's phenomenon, the ringing effect is predomi tly present near the ______ .

The operations that may be performed on vectors in Euclidean Space are1) Inner product, distance between vectors2) Norm of a vector, orthogonal vectors3) Orthonormal functions4) Vector division

A signal x[n] is anti symmetric or odd when

The basic properties of DFT includes1) Linearity2) Periodicity3) Circular symmetry4) Summation

For the calculation of N- point DFT, Radix -2 FFT algorithm repeats

The circular convolution of two sequences in time domain is equivalentto

The transformation technique in which there is one to one mapping from s-domain to z-domain is

The frequency warping is referred as1) lower frequencies in analog domain expanded in digital domain2) lower frequencies in digital domain expanded in analog domain3) non linear mapping4) compression of higher frequencies

The magnitude response of Butterworth filter has1) Flat stop band2) Flat pass band3) Tapering pass band4) Tapering stop band

In the cascaded form of realisation, the polynomials are factored into

Parallel form of realisation is done in

A partial-fraction expansion of the transfer function in Z leads to

The factors formed for partial fraction are a combination of1) Linear factors2) Irreducible quadratic factors3) Square roots4) Cube roots

For designing a multirate LPF with passband 0 to 50 Hz, stopband 60 to 280 Hz, stopband deviation 0.001, passband deviation 0.01 and sampling frequency (f) = 400 Hz, what would be the value of normalized transition width?

How is the sampling rate conversion achieved by factor I/D?

Anti-imaging filter with cut-off frequency = / I is specifically used _______ upsampling process for the removal of unwanted images.

In TMS 320 C6x processor architecture, which functional unit is adopted for transferring the data from register to and from control register?