Electronics and Communication Engineering - Electromagnetic Field Theory

26. 

Ground wave propagation is useful for

A. microwave
B. medium wave
C. short wave
D. long distance

Answer: Option B

Explanation:

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27. 

Radiowaves are electromagnetic waves having frequency range

A. 0.001 to 50 H
B. 0.001 to 50 kHz
C. 0.002 to 50 MHz
D. 0.001 to 1016 Hz

Answer: Option D

Explanation:

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28. 

When a line of any odd multiple of a quarter wavelength is short-circuited it represents

A. unit impedance
B. infinite impedance
C. zero impedance
D. none of the above

Answer: Option B

Explanation:

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29. 

An antenna is considered to be in free space where its height above the ground is

A. λ
B.
C. less than 3λ
D. more than 5λ

Answer: Option D

Explanation:

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30. 

In waveguide Degenerate modes are

A. two mode having same cut off frequency
B. two mode having same power
C. two mode having same phase velocity
D. it is a hypothetical mode

Answer: Option A

Explanation:

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