Electronics and Communication Engineering - Electromagnetic Field Theory

21. 

A TEM wave incident obliquely on a dielectric boundary with εr1 = 2 and εr2 = 1, the angle of incidence for total reflection is

A. 30°
B. 60°
C. 45°
D. 90°

Answer: Option C

Explanation:

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22. 

The total field produced by an antenna array system at a distance from it is

A. sum of the field produced by the individual antennas of the array system
B. directional gain of antenna
C. linear antenna gain
D. vector sum of the field produced by the individual antennas of the array system

Answer: Option D

Explanation:

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23. 

A perfect conductor is a perfect absorber of electromagnetic waves.

A. True
B. False

Answer: Option A

Explanation:

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24. 

In a lead acid cell the density of the acid gives an indication of

A. the level of the acid
B. the eventual damages caused to the plates
C. the charge of the battery
D. the e.m.f. of the battery

Answer: Option C

Explanation:

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25. 

A (0.75 - j50) ohm load is connected to a coaxial transmission line of Z0 = 75 ohms at a frequency of 10 GHz Which of the following will be the best method of matching?

A. Connecting an inductance at the end
B. Connecting a short circuited stub at the load
C. Connecting a capacitance at some distance from the load
D. Connecting a short circuited stub at some specified distance from the load

Answer: Option D

Explanation:

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