Electronics and Communication Engineering - Electromagnetic Field Theory

11. 

Which of the following is abnormal variation in ionosphere?

A. Diurnal variation
B. Seasonal variation
C. Ionospheric storms
D. None of the above

Answer: Option C

Explanation:

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12. 

Laplace equation in cylindrical co-ordinates is given by

A.
B.
C.
D.

Answer: Option A

Explanation:

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13. 

Troposphere is the upper part of the Earth's atmosphere which absorbs large quantities of Sun's radiations.

A. True
B. False

Answer: Option B

Explanation:

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14. 

For resonant long wire antenna 'n' half wavelength long in free space, if 'n' is increased then inclination of the major lobe with wire axis will __________ .

A. increases
B. decreases
C. remains same
D. none

Answer: Option B

Explanation:

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15. 

The maximum effective aperture of λ/2 (half-wave) antenna is

A. 0.013 λ2
B. 0.13 λ2
C. 1.3 λ2
D. 13 λ2

Answer: Option B

Explanation:

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