Electronics and Communication Engineering - Electromagnetic Field Theory

46. 

An alternating current or voltage is that which

A. changes in magnitude only
B. changes in direction only
C. both (a) and (b)
D. has a random movement of electrons

Answer: Option C

Explanation:

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47. 

When the magnetic vector is parallel to the boundary surface and electric vector is parallel to the place of incidence, the polarization is

A. zero
B. vertical
C. perpendicular
D. horizontal

Answer: Option B

Explanation:

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48. 

The total electrical energy emitted overall space from an electron of charge e and radius r is

A. e0r2
B. e20r
C. e2/4pε0r2
D. e2/8pε0r

Answer: Option D

Explanation:

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49. 

In broadside array

A. the principle direction radiation is perpendicular to the array axis and also to the plane containing the array elements
B. the principle direction radiation is parallel to the array axis and also to the plane containing the array elements
C. the principle direction radiation is parallel to the array axis and perpendicular to the plane containing the array elements
D. the principle direction radiation is perpendicular to the array axis and parallel to the plane containing the array elements

Answer: Option A

Explanation:

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50. 

Which of following antenna does not depend upon the frequency?

A. Log-periodic
B. Parabolic
C. Conical
D. All of the above

Answer: Option A

Explanation:

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