Microwave Engineering Lab Viva Questions – Part 10

1. What is the value of TN(0) when N is odd

a) 0

b) 1

c) Depends upon the value of N

d) Does not exist

Answer : [A] 0

Microwave Engineering Lab Viva Questions – Part 9

1) Which of the propagating modes has the lowest cut off frequency in the WR-90(X-band) rectangular waveguide - 0.9 *0.45 ( units of dimensions is inches)

a)TM01

b)TM10

c)TM11

d)TE21

Answer : [c] TM11

Microwave Engineering Lab Viva Questions – Part 8

1. Which of the following does not have 900 phase shift between the output ports

a) Coupled Line Directional Coupler

b) Quadrature Coupler

c) Hybrid Coupler

d) None

Answer : [C] Hybrid Coupler

Microwave Engineering Lab Viva Questions – Part 7

1. Kuroda identities are not used for

A. Transferring short to open

B. Design realizable characteristic impedance

C. Eliminate lumped impedances and capacitors

D. Add spacing between stubs

Answer : [C] Eliminate lumped impedances and capacitors

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

Microwave Engineering Lab Viva Questions – Part 5

1. If all ports of a lossless reciprocal junction is matched, the device must work as a

a) Magic Tee

b) Directional Coupler

c) Either a or b

d) Cannot be specified

Microwave Engineering Lab Viva Questions – Part 4

1) Even mode and odd mode analysis can be done if the network is..

a) Reciprocal

f) a & c

b) Lossless

c) symmetric

d) a & b

e) b & c

g)none.

Microwave Engineering Lab Viva Questions – Part 3

1) The Klystron which we are using in the Microwave bench setup is ..........

a) Two Cavity Klystron

b) Reflex Klystron

c) Both a & b

d) Gunn diode

e) None

Microwave Engineering Lab Viva Questions – Part 2

1. A transmission line of characteristic impedance 50 Ohm operating on 3 GHz, is terminated by a load impedance of 60+j10 Ohm. Find the input impedance at a distance 2.5 cm from the load along the line.

a) 40.5 + j6.76

b) 60 + j10

c) 40.5 - j6.76

d) 60 - j10

Microwave Engineering Lab Viva Questions – Part 1

1) The Frequency meter in the Microwave Bench setup generates

a)X-band frequency (8-12)GHz

b)Microwave Signal

c)Impedance to the Signal which is travelling in the bench setup

d)All the above

e)Nothing.

Digital Signal Processing Laboratory Viva Questions - Part 10

Q.1- Filters with the ________ characteristic are useful when a rapid roll-off is required because it provides a roll-off rate greater than –20/dB/decade/pole.

1. Butterworth
2. Chebyshev
3. Both Butterworth and Chebyshev
4. None of the above

Digital Signal Processing Laboratory Viva Questions - Part 9

Q.1- How many real and complex multipliers are required to implement 8 point radix-2 FFT algorithm.

1. 12 & 48
2. 48 &12
3. 64 &56
4. 12 &64
   
   

Digital Signal Processing Laboratory Viva Questions - Part 8

Q.1- A linear phase channel with phase delay T_p and group delay T_g must have

1. T_p = T_g = constant
2. T_p ∝ f and T_g ∝ f
3. T_p = constant and T_g ∝ f
4. T_p ∝ f and T_g = constant

Digital Signal Processing Laboratory Viva Questions - Part 7

Q.1- If Z0 and 1/Z0 are two poles of H(Z). h(n) is stable system when h(n) is
(a) Left sided sequence
(b) right sided sequence
(c) two sided sequence
(d)  anything

Digital Signal Processing Laboratory Viva Questions - Part 6

Statement for Q.1-2:
      Given the Z transform pair 
                       
Determine the time signal y(n) for corresponding z-transform Y(z) and choose the correct answer.
  
Q.1- Y(z) = X(2z)
a)
b)
c)
d)

Digital Signal Processing Laboratory Viva Questions - Part 5

Q.1-   Determine the DTFT for the given signal and choose correct option.
a)
b)
c)
d) None of the above

Digital Signal Processing Laboratory Viva Questions - Part 4

Q.1-
a) Periodic with period 4
b) Periodic with period 8
c) Periodic with period 16
d) Not periodic

Digital Signal Processing Laboratory Viva Questions - Part 3

Q.1- How are unwanted frequencies removed prior to digital conversion?

1. Pre-filters
2. Digital signal processing
3. Sample-and-hold circuits
4. All of the above

Digital Signal Processing Laboratory Viva Questions - Part 2

Q.1- Consider a causal system H(Z), H(Z)=1/H1(Z), where H1(Z) realizable (linear phase FIR filter), h1(n) ↔ H1(Z)
If we want stable system H(Z), then
(i) h1(n) is type-1 (h1(n) is odd length, symmetric)
(ii) h1(n) is type-2 (h1(n) is even length, symmetric)
(iii) h1(n) is type-3 (h1(n) is odd length, anti-symmetric)
(iv) h1(n) is type-4 (h1(n) is even length, anti-symmetric)

Digital Signal Processing Laboratory Viva Questions - Part 1

Theory_Questions:

Q.1-find the DFT of  x(n)={1,1,1,1,1,1,1,1}
a) {8,-1,0,0,-1,0,0,0}
b) {8,0,2,0,0,0,0,0}
c)  {8,0,0,0,0,0,0,0}
d)  {8,1,0,0,1,0,0,0}
e) None of the above