# Electronics and Communication Engineering - Electromagnetic Field Theory

1.

Whenever a wave is incident on a perfect conductor then the reflection coefficient is

 A. 1 B. 0 C. 1 < 180° D. depend upon η1, η2

Explanation:

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2.

Which one set of the following Maxwell's equation gives the basic idea of radiation ?

 A. B. C. Δ . D = r, Δ . B = 0 D. Explanation:

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3.

When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .

 A. reflection B. refraction C. transmission D. none of the above

Explanation:

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4.

Power gain and directivity related with, Gp power gain, Gd directive gain

 A. Gp = η Gd B. Gd = η Gp C. D. Gp = η Gd2

Explanation:

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5.

Radiation intensity in a given direction is the

 A. energy radiated per square metre B. power radiated per square metre C. power radiated per unit solid angle in that direction D. none of the above