Electronics and Communication Engineering - Electromagnetic Field Theory

1. 

For an incident wave which is normal on the perfect dielectric the reflection factor is given by (where ε1 and ε2 are the permittivities of 1st and 2nd medium respectively)

A.
B.
C.
D.

Answer: Option D

Explanation:

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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:

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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:

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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:

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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:

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