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Electrical Engineering Objective Questions { Electromagnetism }



50. The average power flow per unit area in a uniform plane wave in an electric field of maximum voltage E0 and impedance2Eo
A.10E0Zo
B.10E0Zo
C.10E0Zo
D.10E0Zo

51. When EM waves are perfect conductor, there results incident wave
A. a stronger
B. a stronger reflected wave is
C. a weak reflected wave
D. a standing wave which is not progressing

52. Brewster angle is the angle
A. for which there is reflection and the Incident wave is horizontally polarized
B. for which there is no reflection and the incident wave is vertically polarized
C. given by OB = tan C'
D. none of these

53. Transverse electric (TE) waves have
A. electric component E in the direction of propagation and no component of magnetic field H in this direction
B. magnetic field component H in the direction of propagation and no direction component of electric field E in this
C. both electric field component E and magnetic field component H in the direction of propagation
D. none of these

54. Transverse magnetic (TM) waves have
A. magnetic field component H in the direction of propagation and no component of electric field E in this direction
B. electric field component E in the direction of propagation and no direction component of magnetic field H in this
C. both magnetic field component H and the electric field component E in the direction of propagation
D. neither magnetic field component H nor electric field component E in the direction of propagation

55. In a rectangular waveguide, the following types of wave can exist
A. TE only
B. TM only
C. both TE and TM waves
D. TEM only

56. In a wave guide, attenuation near the el!toff frequency is
A. low
B. high
C. very high
D. Zero

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