Free Printable EC8553_DTSP_QB

1.

DFT is applied to

a)

Infinite sequences

b)

Finite discrete sequences

c)

Continuous infinite signals

d)

Continuous finite sequences

2.

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?

a)

X(k)=N.c_k

b)

X(k)=c_k/N

c)

X(k)=N/c_k

d)

None of the above

3.

If $W_4^{100}$ = $W_x^{200}$ then what is the value of x?

a)

2

b)

4

c)

8

d)

16

4.

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

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

5.

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

6.

DTFT is the representation of

a)

Periodic Discrete time signals

b)

Aperiodic Discrete time signals

c)

Aperiodic continuous signals

d)

Periodic continuous signals

7.

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

8.

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

9.

The transformations are required for

1) Analysis in time or frequency domain

2) Quantization

3) Easier operations

4) 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

10.

The interface between an analog signal and a digital processor is

a)

D/A converter

b)

A/D converter

c)

Modulator

d)

Demodulator

11.

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

12.

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

13.

In Overlap save method of long sequence filtering, what is the length of the input sequence block?

a)

L+M+1

b)

L+M

c)

L+M-1

d)

None of the mentioned

14.

How many complex multiplications are need to be performed for each FFT algorithm?

a)

(N/2).log N

b)

N.log₂N

c)

(N/2).log₂N

d)

None of the mentioned

15.

The following butterfly diagram is used in the computation of __________

a)

Decimation-in-time FFT

b)

Decimation-in-frequency FFT

c)

Both

d)

None of the mentioned

16.

For a decimation-in-time FFT algorithm, which of the following is true?

a)

Both input and output are in order

b)

Both input and output are shuffled

c)

Input is shuffled and output is in order

d)

Input is in order and output is shuffled

17.

FFT may be used to calculate

1) DFT

2) IDFT

3) Direct Z transform

4) 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

18.

DIT algorithm divides the sequence into

a)

Positive and negative values

b)

Even and odd samples

c)

Upper higher and lower spectrum

d)

Small and large samples

19.

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

20.

The first six points of the 8-point DFT of a real valued sequence are 5, 1 − 𝑗3, 0, 3 − 4𝑗, and 3 + 𝑗4. The last two points of the FFT outputs are respectively

a)

0, 1 − 𝑗3

b)

0, 1 + 𝑗3

c)

1 + 𝑗3, 5

d)

1 − 𝑗3, 5

21.

What is the order of the normalized low pass Butterworth filter used to design a analog band pass filter with -3.0103dB upper and lower cutoff frequency of 50Hz and 20KHz and a stop band attenuation -20dB at 20Hz and 45KHz?

a)

2

b)

3

c)

4

d)

5

22.

The chebyshev-I filter is equi-ripple in pass band and monotonic in the stop band.

a)

True

b)

False

23.

What is the number of minima’s present in the pass band of magnitude frequency response of a low pass chebyshev-I filter of order 4?

a)

1

b)

2

c)

3

d)

4

24.

The poles of Chebyshev filters are found to lie on ___________

a)

Circle

b)

Ellipse

c)

Parabola

d)

Hyperbola

25.

Which of the following rule is used in the bilinear transformation?

a)

Simpson’s rule

b)

Forward difference

c)

Trapezoidal rule

d)

Backward difference

26.

If s=σ+jΩ and z=rejω, then what is the condition on σ if r<1?

a)

σ > 0

b)

σ < 0

c)

σ > 1

d)

σ < 1

27.

If s=σ+jΩ and z=rejω and r=1, then which of the following inference is correct?

a)

Imaginary axis in the s-plane is mapped to the circle, |z|=1

b)

RHS of the s-plane is mapped outside the circle, |z|=1

c)

LHS of the s-plane is mapped inside the circle, |z|=1

d)

None of the mentioned

28.

What is the kind of relationship between Ω and ω?

a)

Many-to-one

b)

One-to-many

c)

One-to-one

d)

Many-to-many

29.

Which of the following filters cannot be designed using impulse invariance method?

a)

Low pass

b)

High pass

c)

Low and band pass

d)

Band pass

30.

Low pass Butterworth filters are also called as _____________

a)

All-zero filter

b)

All-pole filter

c)

Pole-zero filter

d)

None of the mentioned

31.

Type-2 chebyshev filters consists of ______________

a)

Only poles

b)

Only zeros

c)

Both poles and zeros

d)

Cannot be determined

32.

Which of the following is true in the case of Butterworth filters?

a)

Wide transition band

b)

Smooth pass band

c)

All of the mentioned

33.

Filter parameter optimization technique is used for designing of which of the following?

a)

IIR in frequency domain

b)

FIR in time domain

c)

FIR in frequency domain

d)

IIR in time domain

34.

The IIR filter designing involves

a)

Designing of analog filter in analog domain and transforming into digital domain

b)

Designing of analog filter in digital domain and transforming into analog domain

c)

Designing of digital filter in analog domain and transforming into digital domain

d)

Designing of digital filter in digital domain and transforming into analog domain

35.

Which of the following is the correct expression for transition band Δf?

a)

(ωp– ωs)/2π

b)

(ωp+ωs)/2π

c)

(ωp.ωs)/2π

d)

(ωs– ωp)/2π

36.

Computation of the analog frequency $\Omega$ from the digital frequency ω using the frequency warping formula so that
the frequency-distortion in bilinear transformation is compensated

a)

Spectral factorization

b)

Zero-phase filtering

c)

Prewarping

d)

all of the above

37.

Canonical structure is a structure that is implemented using the minimum possible number of delay elements. __________________is a canonical structure.

a)

Direct form I

b)

Direct form II

c)

Both Direct form I & Direct form II

d)

None of these

38.

Computation of the analog frequency $\Omega$ from the digital frequency ω using the frequency warping formula so that
the frequency-distortion in bilinear transformation is compensated

a)

Spectral factorization

b)

Zero-phase filtering

c)

Prewarping

d)

all of the above

39.

The bilinear transformation is an invertible nonlinear mapping between the s-plane and the z-plane defined by

a)

$s=\frac{2}{T_{d\ }}\left(\frac{1-z^{-1}}{1+z^1}\right)$

b)

$s=\frac{2}{T_{d\ }}\left(\frac{1-z^{-1}}{1+z^{-1}}\right)$

c)

$s=\frac{2}{T_{d\ }}\left(\frac{1-z^1}{1+z^{-1}}\right)$

d)

$s=\frac{2}{T_{d\ }}\left(\frac{1+z^{-1}}{1-z^{-1}}\right)$

40.

The Bilinear Transformation maps the left half of an s-plane to the__________ unit circle of the z-plane

a)

inside

b)

outside

c)

imaginary axis of

d)

centre of the

41.

Min. Stopband attenuation of Hamming window

a)

52

b)

53

c)

54

d)

50

42.

The window function

0.54-0.46\ \cos\ \left(\frac{2\pi n}{M-1}\right)

represent

a)

Blackman

b)

Hamming

c)

Hanning

d)

Bartlett (triangular)

43.

Hanning window function can be expressed as

a)

$W_{Hann}\left(n\right)=0.5\left(1-\cos\ \left(\frac{2\pi n}{M-1}\right)\right)$

b)

$W_{Hann}\left(n\right)=0.5\left(1+\cos\ \left(\frac{2\pi n}{M-1}\right)\right)$

c)

$W_{Hann}\left(n\right)=0.5\left(1-2\cos\ \left(\frac{2\pi n}{M-1}\right)\right)$

d)

$W_{Hann}\left(n\right)=0.5\left(1+2\cos\ \left(\frac{2\pi n}{M-1}\right)\right)$

44.

An FIR filter of length M having the unit sample response $h\left(n\right)=\frac{\left(\sin\ \omega\ _c\left(n-\frac{\left(M-1\right)}{2}\right)\right)}{\pi\ \left(n-\frac{\left(M-1\ \right)}{2}\right)},\ n\ne\frac{\left(M-1\right)}{2}$ if M is selected to be odd, the value of h(n) at $n=\frac{\left(M-1\right)}{2\ }$ is

a)

$h\left(\frac{M-1}{2}\right)=\frac{\omega_c}{\pi}$

b)

$h\left(\frac{M-1}{2}\right)=\frac{\omega_c}{2\pi}$

c)

$h\left(\frac{M-1}{2}\right)=\frac{\omega_c}{2}$

d)

$h\left(\frac{M-1}{2}\right)=\frac{\omega_c}{\pi^{2\ }}$

45.

The Fourier Transform of the Rectangular window is

W_R\left(\omega\ \right)=e^{-\left(j\omega\ \frac{\left(M-1\right)}{2}\right)}\ \left(\frac{\sin\left(\frac{\omega M}{2}\right)}{\sin\left(\frac{\omega}{2}\right)}\right)

, the the Magnitude response is

a)

$\ \left|W_R\left(\omega\right)\right|=\frac{\left|\sin\left(\frac{\omega M}{2}\right)\right|}{\left|\sin\left(\frac{\omega}{2}\right)\right|},\ -\pi\le\omega\le\pi$

b)

$\left|W_R\left(\omega\right)\right|=\frac{\left|\sin\left(\frac{\omega M}{2}\right)\right|}{\left|\sin\left(\frac{\omega}{2}\right)\right|},\ \pi\le\frac{\omega}{2}\le\pi$

c)

$\left|W_R\left(\omega\right)\right|=\frac{\left|\sin\left(\frac{\omega M}{2}\right)\right|}{\left|\sin\left(\frac{\omega}{2}\right)\right|^2},\ -\pi\le\omega\le\pi$

d)

$\left|W_R\left(\omega\right)\right|=\frac{\left|\sin\left(\frac{\omega M}{2}\right)\right|}{2\text{x}\left|\sin\left(\frac{\omega}{2}\right)\right|},\ -\pi\le\omega\le\pi$

46.

Window function is used to alleviate the presence of large oscillations in

a)

the passband

b)

both the passband and the stopband

c)

the stopband

d)

None of these

47.

Which of the following condition should the unit sample response of a FIR filter satisfy to have a linear phase?

a)

h(M-1-n)

n=0,1,2…M-1

b)

±h(M-1-n)

n=0,1,2…M-1

c)

-h(M-1-n)

n=0,1,2…M-1

d)

None of the Above

48.

The roots of the polynomial H(z) are identical to the roots of the polynomial H(z^-1).

a)

TRUE

b)

FALSE

49.

What is the value of h(M-1/2) if the unit sample response is anti-symmetric?

a)

0

b)

1

c)

-1

d)

0.5

50.

What is the number of filter coefficients that specify the frequency response for

h(n) symmetric?

a)

(M-1)/2

when M is odd and M/2 when M is even

b)

(M-1)/2

when M is even and M/2 when M is odd

c)

(M+1)/2

when M is even and M/2 when M is odd

d)

(M+1)/2

when M is odd and M/2 when M is even

51.

Which of

the following is not suitable either as low pass or a high pass filter?

a)

h(n)

symmetric and M odd

b)

h(n)

symmetric and M even

c)

h(n)

anti-symmetric and M odd

d)

h(n)

anti-symmetric and M even

52.

How is the frequency response of an ideal differentiator related to the frequency?

a)

Inversely proportional

b)

Linearly proportional

c)

Quadratic

d)

None of the mentioned

53.

If hd(n) is the unit sample response of an ideal differentiator, then what is the value of hd(0)?

a)

1

b)

-1

c)

0

d)

2

54.

Consider the assertions given below. Which among them is an advantage of FIR Filter?

a)

Presence of linear phase response

b)

Necessity of computational techniques for filter implementation

c)

Requirement of large storage

d)

Incapability of simulating prototype analog filters

55.

Which of the following is the condition that an differentiator should satisfy?

a)

Infinite response at zero frequency

b)

Finite response at zero frequency

c)

Negative response at zero frequency

d)

Zero response at zero frequency

56.

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

a)

Unity

b)

Zero

c)

Infinity

d)

Unpredictable

57.

Which of the following is an method for implementing an FIR system?

a)

Direct form

b)

Cascade form

c)

Lattice structure

d)

All of the mentioned

58.

The realization of FIR filter by frequency sampling realization can be viewed as cascade of how many filters?

a)

Two

b)

Three

c)

Four

d)

None of the mentioned

59.

Which of the following filters have a cascade realization as shown below?

a)

IIR filter

b)

Comb filter

c)

High pass filter

d)

FIR filter

60.

For the IIR filter, M and N respectively the order of numerator and denominator of the system function, then the number of multiplications required in direct form-I realization is.

a)

M+N-1

b)

M+N

c)

M+N+1

d)

M+N+2

61.

List the important finite word length effects in digital filter implementation.

4 lines

62.

What are the two methods of quantization?

4 lines

63.

What are the two methods of quantization?

4 lines

64.

What is meant truncation error?

4 lines

65.

What is meant rounding error?

4 lines

66.

An effective remedy for curing the problem of overflow oscillations is to modify the adder characteristic.

a)

True

b)

False

67.

The limit cycle mode with zero input, which occurs as a result of rounding the multiplications, corresponds to an equivalent second order system with poles at z=±1.

a)

True

b)

False

68.

Which of the following should be done in order to convert a continuous-time signal to a discrete-time signal?

a)

Sampling

b)

Differentiating

c)

Integrating

d)

None of the mentioned

69.

The process of converting discrete-time continuous valued signal into discrete-time discrete valued (digital) signal is known as ____________

a)

Sampling

b)

Quantization

c)

Coding

d)

None of the mentioned

70.

Which of the following is a digital-to-analog conversion process?

a)

Staircase approximation

b)

Linear interpolation

c)

Quadratic interpolation

d)

All of the mentioned

71.

If ‘F’ is the frequency of the analog signal, then what is the minimum sampling rate required to avoid aliasing?

a)

F

b)

2F

c)

3F

d)

4F

72.

The quality of output signal from A/D converter is measured in terms of ___________

a)

Quantization error

b)

Quantization to signal noise ratio

c)

Signal to quantization noise ratio

d)

Conversion constant

73.

Which bit coder is required to code a signal with 16 levels?

a)

8 bit

b)

4 bit

c)

2 bit

d)

1 bit

74.

The process of discarding all bits less significant than LSB that is retained,

a)

Truncation

b)

Rounding

c)

Fixed point representation

d)

None of the above

75.

What Are the Different Quantization Methods (1. Truncation , 2. Rounding, 3. Saturation Arithmetic, 4. Scaling)

a)

1 & 2

b)

3 & 4

c)

1 & 4

d)

2 & 3

76.

Issue connected with finite word length effect is

a)

Limit cycles in IIR filter

b)

produce quantization error and coefficient quantization error

c)

Both the above

d)

None of the above

77.

Which of the following is a deterministic frequency response?

a)

produce quantization error

b)

coefficient quantization error

c)

Both the above

d)

None of the above

78.

Find the data acquisition time for a setup of block size, BS=8192 samples and sampling frequency, SR=2048 samples/sec

a)

1 sec

b)

2 sec

c)

4 sec

d)

8 sec

79.

What is the dead band of a single pole filter with a pole at 3/4 and represented by 4 bits?

a)

(-1/2,1/2)

b)

(-1/8,1/8)

c)

(-1/4,1/4)

d)

(-1/16,1/16)

80.

In the equation

SQNR = 6.02b + 16.81 – $20\log_{10}⁡\frac{R}{σ_x}$ for R = 6σx the equation becomes?

a)

SQNR = 6.02b-1.25 dB

b)

SQNR = 6.87b-1.55 dB

c)

SQNR = 6.02b+1.25 dB

d)

SQNR = 6.87b+1.25 dB

81.

In DSP Processor, what kind of queuing is undertaken/executed through instruction register and instruction cache?

a)

Implicate

b)

Explicate

c)

Both a and b

d)

None of the above

82.

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)

Data Address Generators (DAGs)

b)

Program sequences

c)

Barrel Shifter

d)

MAC

83.

Which units are generally involved in Multiply and Accumulate (MAC)?

a)

Adder

b)

Multiplier

c)

Accumulator

d)

All of the above

84.

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

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

85.

The speech signal is obtained after

a)

Analog to digital conversion

b)

Digital to analog conversion

c)

Modulation

d)

Quantization

86.

The interface between an analog signal and a digital processor is

a)

D/A converter

b)

A/D converter

c)

Modulator

d)

Demodulator

87.

Which type of architecture uses different storage space for program code and the data?

a)

Von Neumann architecture

b)

Harvard architecture

c)

Fragmented architecture

d)

Split cell architecture

88.

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)

Data Address Generators (DAGs)

b)

Program sequences

c)

Barrel Shifter

d)

MAC

89.

What is the reason for the need of high speed DSP?

a)

Less power consumption at higher speeds

b)

Better processing capabilities

c)

High sampling frequency

d)

Easily programmable

90.

Who is credited with creating the stored program concept?

a)

John Von Neumann

b)

Larry Page

c)

Alan Turing

d)

Ken Thompson

91.

What is the colour format of chrominance in a digital signal processor?

a)

VGBA

b)

VIBGYOR

c)

White

d)

RGBA

92.

Who invented VLIW architecture?

a)

Josh Fisher

b)

John Ellis

c)

John Ruttenberg

d)

John O’Donnell

93.

Which of the processor is a good match for applications such as video games?

a)

GPU

b)

VLIW

c)

Coprocessor

d)

Microcontroller

94.

A single-precision floating-point number represented

within a 32-bit register has _______ bit exponent and _____bit fraction.

a)

8, 23

b)

11, 52

c)

64, 52

d)

32, 23

95.

The CPU of TMS320C67x has

a)

6 functional units, 2 register files, 4 datapaths

b)

8 functional units, 2 register files, 2 datapaths

c)

6 functional units, 4 register files, 4 datapaths

d)

8 functional units, 4 register files, 2 datapaths

96.

The instruction, Add #45,R1 does

a)

Adds the value of 45 to the address of R1 and stores 45 in that address

b)

Adds 45 to the value of R1 and stores it in R1

c)

Finds the memory location 45 and adds that content to that of R1

d)

None of the mentioned

97.

In C6X processor, which external device/s get/s acquire/s an interface support by EMIF peripheral?

a)

Synchronous burst

b)

Asynchronous devices

c)

Externally shared memory devices

d)

All of the above

98.

In TMS 320 C6x processor architecture, which operation/s is/are performed by 'M' functional unit?

a)

Bit expansion

b)

Bit interleaving & deinterleaving

c)

Rotation & Variable shifting

d)

All of the above

99.

DSP applications

a)

Wireless communication

b)

RADAR

c)

Medical

d)

none of the above

e)

all the above

100.

DSP algorithms

a)

Speech synthesis

b)

Motion estimation

c)

Noise cancellation

d)

All the above

EC8553_DTSP_QB_Part-A

Total questions: 100

Worksheet time: 1hrs 27mins

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