Electronics and Communication Engineering - Electromagnetic Field Theory MCQs Part 7

1.When the phase velocity of an EM wave depends on frequency in any medium, the phenomenon is called

A. scattering
B. polarization
C. absorption
D. dispersion

 Answer Option B

2.A hertzian dipole has a radiation pattern with

A. a null in the direction of the dipole
B. a null in the plane perpendicular to the dipole
C. a peak in the direction of the dipole
D. none of the above

 Answer Option A

3.Circular polarized waves result when

A. magnitudes are the same
B. phases are the same
C. magnitudes are same and phase difference is 90°
D. magnitudes are same and phase difference is zero

 Answer Option C

4.Permeance is analogue to

A. reluctance
B. conductance
C. capacitance
D. resistance

 Answer Option B

5.Skip distance (D) is

A. (D ∝ f)
C. D = f
D. D < f

 Answer Option A

6.A very reliable service has to be established between two points on earth separated by 1000 km. The band that will be used as


 Answer Option C

7.A rectangular waveguide (2.29 x 1.02) cm operates at a freq. of 11 GHz in TE10 mode. If the maximum potential gradient of the signal is 5 kV/cm, then the maximum power handling capacity of the waveguide will be

A. 31.11 mW
B. 31.11 W
C. 31.11 kW
D. 31.11 MW

 Answer Option C

8.A parabolic antenna produces a radiation pattern which is

A. circularly polarized
B. highly directional
C. omnidirectional
D. linearly polarized

 Answer Option B

9.Considerable ionization occurs between the range

A. 50 km to 400 km
B. 100 to 400 km
C. 50 km to 250 km
D. 10 to 50 km

 Answer Option A

10.Gain of isotropic antenna is

A. 10 dB
B. 0 dB
C. ∞
D. 1 dB

 Answer Option A


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