Electronics and Communication Engineering - Electromagnetic Field Theory

16. 

End fire array is called a linear resonant dipole array.

A. True
B. False

Answer: Option A

Explanation:

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17. 

Which of the following statements is incorrect regarding Balun transformer?

A. It changes impedance like current transformer
B. It changes balanced to unbalanced line
C. It is used to couple a co-axial line to a parallel line wire
D. Any of the above

Answer: Option A

Explanation:

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18. 

The maximum usable frequency for the 'E' layer is 10 MHz.

A. True
B. False

Answer: Option A

Explanation:

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19. 

In free space

A. phase velocity is greater than light velocity
B. phase velocity is equal to group velocity
C. phase velocity is equal to light velocity
D. Both (b) and (c)

Answer: Option D

Explanation:

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20. 

Laplacian of a scalar function V is

A. gradient of V
B. gradient of the gradient of V
C. divergence of V
D. divergence of the gradient of V

Answer: Option D

Explanation:

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