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# DFCCIL EE/EC Electromagnetic Fields QUIZ - 7

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Question 1

Which one of the following is the correct relationship between an antenna gain G and effective area Ae?

Question 2

If aperture efficiency is 70%, the directivity D of a parabolic dish antenna as a function of its radius is

Question 3

A dipole is 0.1 m long and has an internal resistance of 0.1 ohm. The dipole has radiation resistance of 0.3 Ω. The antenna efficiency is

Question 4

An antenna has a power input of 40 π watts and an efficiency of 90 %. The radiation intensity has been found to have a maximum value of 150 Watts/unit solid angle. Directivity of the antenna is

Question 5

An antenna with an efficiency of 90% has a maximum radiation intensity of 0.,5 W/Steradian. Calculate the directive gain of the antenna when the input power to the antenna when the input power to the antenna is 0.4 W

Question 6

Two communication antennas A and B, are operating at 300 MHz and other at 3 GHz respectively and having same gain, are illuminated with identical flux density of -100 dBW/m2. What is the relation between the received powers (PA : PB)?
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