# It is desired to reduce the reflection at an air porcelain by use of λ/4 plate Thickness of the polystyrene plate required at 10 GHz will be

1.  5.039

2.  50.39 cm

3.  0.5039 cm

4.  0.05039 cm

4

0.5039 cm

Explanation :
No Explanation available for this question

# An electromagnetic wave from an underwater source with perpendicular to polarization is incident on a water-air interface at angle 200 with normal to surface. For water assume μr=8.1, and μ=1.The critical angle θc is

1.  83.620

2.  6.380

3.  42.60

4.  none of these.

4

6.380

Explanation :
No Explanation available for this question

# If transmission of a parallel polarized wave from a dielectric medium of permittivity 2, there exists a value of the angle of incidence θp. for which the reflection coefficient is zero, then

1.  tanh θp=√1/ ε2

2.  tan θp=√?1/ ε2

3.  an θp=√?2/ ε1

4.  tanh θp=√?2/ ε1

4

an θp=√?2/ &epsilon;1

Explanation :
No Explanation available for this question

# On the boundary, reflected energy is

1.  6.25%

2.  12.5%

3.  25%

4.  50%

4

6.25\%

Explanation :
No Explanation available for this question

# SWR is

1.  1.67

2.  0.6

3.  2

4.  1.16

4

1.67

Explanation :
No Explanation available for this question

# For electromagnetic wave propagation in free space, the free space is defined as

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# Which one of the following statements is NOT CORRECT for a plane wave with

1.  Wave frequency 106 r.p.s.

2.  Wavelength is 3.14 m

3.  Wave travels along + x-direction

4.  Wave is polarised in the z- 'direction

4

Wave is polarised in the z- 'direction

Explanation :
No Explanation available for this question

# For incidence from dielectric medium 1(1) onto dielectric medium 2(?2) the Brewster angle θp and corresponding angle of transmission θt for ?2/ ?1=3 will be respectively

1.  300 and 300

2.  300 and 600

3.  600 and 300

4.  600 and 600

4

600 and 300

Explanation :
No Explanation available for this question

# For a uniform plane wave of frequency 106Hz propagating in a good conductor, the field undergoes a change in a phase by 2π radians over a distance of 1m. The field is attenuated by a factor of /1e at a distance of

1.  1/ 2π m

2.  1/ π m

3.  π m

4.  2π m

4

1/ 2π m

Explanation :
No Explanation available for this question

1.  0.64

2.  3.27

3.  238

4.  4.16

4