Electronics and Communication Engineering - Electromagnetic Field Theory

1. 

Tropospheric scatter is used with frequencies in the

A. HF
B. VHF
C. UHF
D. VLF

Answer: Option C

Explanation:

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2. 

A Yagi antenna has a driven antenna

A. only
B. with a reflector
C. with one or more directors
D. with a reflector and one or more directors

Answer: Option D

Explanation:

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3. 

The minimum height of outer atmosphere is

A. 100 km
B. 150 km
C. 200 km
D. 400 km

Answer: Option D

Explanation:

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4. 

An electric charge Q is placed in a dielectric medium which of the following quantities are independent of the dielectric constant ε of the medium

A. electric potential V and electric field intensity E
B. displacement density D and displacement φ
C. electric field intensity E and displacement φ
D. electric potential V and displacement φ

Answer: Option B

Explanation:

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5. 

A square corner reflector is used in

A. radio astronomy
B. tv broadcast
C. point to point communication
D. all of the above

Answer: Option D

Explanation:

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