Electromagnetic Field Thoery - ECE Questions and Answers

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A hertzian dipole has a radiation pattern with

a null in the direction of the dipole

a null in the plane perpendicular to the dipole

a peak in the direction of the dipole

none of the above

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Circular polarized waves result when

magnitudes are the same

phases are the same

magnitudes are same and phase difference is 90°

magnitudes are same and phase difference is zero

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Permeance is analogue to

reluctance

conductance

capacitance

resistance

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Skip distance (D) is

(D ∝ f)

D = f

D < f

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

VHF

VLF

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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

31.11 mW

31.11 W

31.11 kW

31.11 MW

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A parabolic antenna produces a radiation pattern which is

circularly polarized

highly directional

omnidirectional

linearly polarized

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Considerable ionization occurs between the range

50 km to 400 km

100 to 400 km

50 km to 250 km

10 to 50 km

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Gain of isotropic antenna is

10 dB

0 dB

∞

1 dB