Microwave Engineering Lab Viva Questions – Part 6

1. For a low pass filter design, which one among the following provides the steepest transition

a. Binomial Function

b. Chebyshev Function

c. Linear phase Butterworth function

d. Elliptical function

e. None

 

Answer : [d] Elliptical function

2. Which of the following filter can be used for Modulation and Mixing applications

a. Butterworth Filters

b. Chebyshev Filters

c. Linear Phase Butterworth Filters

d. Elliptic Filters

Answer : [c] Linear Phase Butterworth Filters

3. Which of the following statements are true

i) Higher ripple in Passband leads to shallow transition to stop band

ii) Higher ripple in Passband leads to steeper transition to stop band

iii) Lower ripple in Passband leads to shallow transition to stop band

iv) Lower ripple in Passband leads to steeper transition to stop band

a. Only (i)

b. Both (i) and (iv)

c. Both (ii) and (iii)

d. Only (ii)

e. Only (iii)

f. Only (iv)

Answer : [c] Both (ii) and (iii)

4. To maintain a passband ripple level of 2 dB using Chebyshev filter, the value of constant coefficient is _______

a) 0.3493

b) 0.2434

c) 1

d) 0.5088

e) 0.7648

Answer : [e] 0.7648

5. Frequency range of operation of Lumped LC- type filters is

a. 100 Hz – 0.1 GHz

b. 100 Hz – 1 GHz

c. 10 MHz – 5 GHz

d. 5 GHz – 100 GHz

Answer : [b] 100 Hz – 1 GHz

6. For a Nth order Maximally flat response attenuation rate in stop band is

a) 10N dB/decade

b) 20N dB/decade

c) 30N dB/decade

d) 40N dB/decade

Answer : [b] 20N dB/decade

7.Why can’t we use lumped elements to fabricate filters in microwave frequencies?

a) Difficult to fabricate lumped elements

b) They start to work as distributed elements

c) Both a & b

d) None of these

Answer : [c] Both a & b

8. ) Equal ripple filter is also called__________ filter

a) Maximally flat

b) Butterworth

c) Linear phase

d) Chebyshev

Answer : [d] Chebyshev

9. Which of the following statements are correct

1. To get the sharper cutoff it is better to use Butterworth filter.

2. To get the smooth pass band it is better to use Chebyshev filter.

a) Both 1 & 2 are true

b) Both are false

c) 1 is true & 2 is false

d) 1 is false & 2 is true

e) None

Answer : [b] Both are false

10) As order of the filter Increases

a) we will be getting sharper cutoff

b) Number of Components in the filter Increase

c) Design becomes complex

d) all the above

e) None

Answer : [d] all the above