Microwave Engineering Lab Viva Questions 1

Theory_Questions:

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.

Answer : [e] X-band frequency (8-12)GHz

2) A Rectangular Wave guide having the dimensions a & b (b>a) , then the Dominant mode of

propagation in TE case is

a) TE₁₀

b) TE₁₁

c) TE₀₁

d) TE₀₀

Answer : [c] TE₀₁

3) In Micro strip line case we are getting Quasi TEM mode of propagation because

1) It acts as two conductors

2) Small in size

3) Dielectric- air Interface

4) Its planar Structure

a) 1 & 2

b) 4 & 3

c) only 3

d) 1 & 3

e) only 4

Answer : [d]1 & 3

5) If “d” is the thickness of a dielectric slab waveguide. The dominant mode size (dmode) of the dielectric waveguide is

a) d_mode is less than d

b) d_mode is equal to d

c) d_mode is greater than d

d) cannot be determined

e) none of the above

Answer : [c] d_mode is greater than d

6) The Dominant mode in a Square wave guide is

a) TE₀₁

b) TE₁₁

c) TE₁₀

d) TE₀₀

Answer : [a] TE₀₁

7) TE mode have

a) Magnetic field vector in the direction of propagation

b) Electric field vector in the direction of propagation

c) Both E & H in the direction of propagation

d) No E & H in the direction of propagation

e) None of the above

Answer : [a] Magnetic field vector in the direction of propagation

8). Microwave Frequencies are harmful because

a) They have a very small wavelength

b) Water molecules are resonant at these frequencies

c) Both a and b

d) Only a

e) None of the above

Answer : [b] Water molecules are resonant at these frequencies

9) In the Strip line case if the relative dielectric constant value is 9 F/m then the phase velocity of the wave which is travelling inside the strip line if the strip width is 0.3nm and height of the dielectric slab 0.5mm.

Answer : 10¹⁰ CM/S

10) In the above problem if the strip line is operating at 10GHz frequency then the propagation constant of that strip line is.

a)Insufficient data

b)628

c) 6.28

d)4.52

e) 452

f)None

Answer : [b] 628