Electronics and Communication Engineering - Electromagnetic Field Theory

36. 

In a four element Yagi-Uda antenna

A. there is one driven element, one director and two reflectors
B. there is one driven element, two directors and one reflector
C. there are two driven elements, one director and two reflectors
D. all the 4 elements are driven element

Answer: Option B

Explanation:

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37. 

The statement that the line integral of magnetic field about any closed path is exactly equal to the direct current enclosed by that path, is known as

A. Ampere's circuital law
B. Coulomb's law
C. Electrostatic's theory
D. None of the above

Answer: Option A

Explanation:

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38. 

Transverse magnetic (TM) waves have

A. magnetic field component H in the direction of propagation
B. electric field component E in the direction of propagation
C. magnetic field component H in the direction of propagation and no component of electric field E in this direction
D. electric field component E in the direction of propagation and no component of magnetic field H in this direction

Answer: Option D

Explanation:

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39. 

UHF and microwaves in the frequency range 300 MHz to 30 GHz can be best transmitted using __________ propagation

A. sky wave
B. ground wave
C. duct
D. none of the above

Answer: Option C

Explanation:

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40. 

The directive gain of λ/2 resonant wire is 1.64.

A. True
B. False

Answer: Option A

Explanation:

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