Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise :: Electromagnetic Field Theory - Section 10
1.
For an incident wave which is normal on the perfect dielectric the reflection factor is given by (where ε_{1} and ε_{2} are the permittivities of 1st and 2nd medium respectively)

Answer: Option D

Explanation:

2.
For EM wave propagation in free space, the free space is defined as

A.
σ = 0, ε = 1, μ ≠ 1, = 0 B.
σ = 0, ε = 1, μ = 1, = 0, = 0 C.
σ ≠ 0, ε > 1, μ < 1, ≠ 0, = 0 D.
σ = 0, ε = 1, μ = 1, ≠ 0, ≠ 0

Answer: Option D

Explanation:

3.
For TE or TM modes of propagation in bounded media, the phase velocity is

A.
independent of frequency B.
is a linear function of frequency C.
is a non-linear function of frequency D.
can be frequency dependent or frequency independent on the source

Answer: Option C

Explanation:

4.
Frequencies in the UHF range propagate by means of

A.
space wave B.
surface waves C.
sky waves D.
ground waves

Answer: Option A

Explanation:

5.
Intrinsic or characteristic impedance of free space has a value of

A.
120 ohm B.
73 ohm C.
73 ε ohm D.
120 ε ohm

Answer: Option D

Explanation: