Free Printable 21EC5252-DSP-Unit 3-FIR filter design

1.

Which of the following statements is true regarding the impulse response of a symmetric FIR filter?

a)

It is real and even

b)

It is real and odd

c)

It is complex and even

d)

It is complex and odd

2.

Which of the following is true about window design for FIR filter

a)

Windows provided flexibility in design

b)

The ripples in both passband and stop band are almost completely removed

c)

More computational efforts required to obtain filter coefficients

d)

Window functions not readily available in closed form expressions

3.

Which of the following defines the rectangular window function of length M-1?

a)

w(n)= 1, n=0,1,2…M-1 ;; =0, else where

b)

w(n)= 1, n=0,1,2…M-1 ;; = -1, else where

c)

w(n)= 0, n=0,1,2…M-1 ;; =1, else where

d)

None of the mentioned

4.

A high pass filter is

a)

a filter with a bell shaped curve around the filters' active frequency

b)

a filter with a constant level after reaching the filters active frequency

c)

a filter that cuts the high frequency component of a signal

d)

a filter that cuts the low frequency component of a signal

5.

FIR filter have ………., IIR filter have………

a)

Zeros, Poles & Zeros

b)

Poles & Zeros, Zeros

c)

Zeros, Zeros

d)

Poles , Poles

6.

A filter is said to be linear phase filter if the phase delay and group delay are _______

a)

High

b)

Moderate

c)

Low

d)

Constant

7.

A ________ filter rejects all frequencies within a specified band and passes all those outside this band.

a)

Low pass

b)

High pass

c)

Band pass

d)

Band stop

8.

FIR filters ________ (1. are non-recursive 2. do not adopt any feedback 3. are recursive 4. use feedback)

a)

1 & 2

b)

3 & 4

c)

1 & 4

d)

2 & 3

9.

In the frequency sampling method for FIR filter design, we specify the desired frequency response Hd(?) at a set of equally spaced frequencies

a)

true

b)

false

10.

Which of the following is introduced in the frequency sampling realization of the FIR filter?

a)

Poles are more in number on unit circle

b)

Zeros are more in number on the unit circle

c)

Poles and zeros at equally spaced points on the unit circle

d)

None of the mentioned

11.

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)

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

12.

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)

13.

The filter that allows signal with the cut off frequency from 0 to wc, then the filter is called as

a)

Low pass filter

b)

High Pass Filter

c)

Band Pass Filter

d)

Band Reject Filter

14.

Symmetric impulse response having odd number of samples, N = 7 with centre of symmetry is equal to

a)

2

b)

2.5

c)

1

d)

3

15.

The oscillations developed due to truncation of impulse response is called

a)

Windows

b)

Gibbs Phenomenon

c)

Finite Word Length Effect

d)

None of the above

16.

The frequency response of a digital filter is periodic in the range

a)

0 to Pi

b)

-pi to pi

c)

-pi to 0

d)

All are correct

17.

The antisymmetric condition is

a)

h(n)=h(N-1-n)

b)

h(n)=h(N-1)

c)

-h(n)=h(N-1-n)

d)

h(n)=0

18.

The Advantages of FIR filter are (a)Stable (b)Linear phase (c) Realized in both Recursive and Non recursive Structure

a)

(a)&(b) are Correct

b)

(a)&(c) are Correct

c)

(b)&(c) are Correct

d)

All are correct

19.

Which of the following is the disadvantage of Hanning window over rectangularwindow?

a)

More side lobes

b)

Less side lobes

c)

More width of main lobe

d)

None of the mentioned

20.

The different structures for representing FIR Filters are (i)Cascade Form (ii)Transposed Form (iii)Direct Form (iv)Parallel Form

a)

(i), (ii) and (iii)

b)

(iii)

c)

(i) and (iii)

d)

(i) and (iv)

21.

Which blocks are not considered the basic building blocks for filter structures?

a)

Adder

b)

Subtractor

c)

Multiplier

d)

Delay

22.

Which of the following is the first method proposed for design of FIR filters?

a)

Chebyshev approximation

b)

Frequency sampling method

c)

Windowing technique

d)

None of the mentioned

23.

The values of cutoff frequencies in general depend on which of the following?

a)

Type of the window

b)

Length of the window

c)

Type & Length of the window

d)

None of the mentioned

24.

Direct form realization of FIR filters requires ___ registers

a)

2M

b)

M

c)

M-1

d)

M+1

25.

The desired frequency response is specified at a set of equally spaced frequencies defined by the equation

a)

π2M(k+α)

b)

πM(k+α)

c)

2πM(k+α)

d)

None of the mentioned

21EC5252-DSP-Unit 3-FIR filter design

Total questions: 25

Worksheet time: 13mins

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