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GATE 2023 EMT Quiz 43

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Question 1

A certain antenna with an efficiency of 95% has maximum radiation intensity of 0.5 W/sr. The input power is 0.4 W. The directivity of antenna (in dB) is …………………

Question 2

A circular loop antenna with radius r=0.60m, is operating at 2MHz. If conductivity of the wire is 57mS/m, and radius of wire is 0.2mm, then determine the radiation resistance (in ) of the antenna. (Given that: μr= 1)

Question 3

An electric field of strength 10 mV/m is existing a region at 50 MHz switching frequency. A half wave dipole antenna with Directivity 1.68 receives how much power( in μW) from the existing field?

Question 4

A 1 m long centre fed dipole antenna operate at 1.5 MHz. The dipole is made of material having conductivity 6 × 107 s/m and radius of 1.5 mm. The radiation efficiency of antenna is ……….. %.

Question 5

The radiation intensity of a given antenna is U = 2(sinθ sinφ) in the range 0 ≤ θ ≤ π and 0 ≤ φ ≤ π and 0 elsewhere. The direction is

Question 6

Transmitting and receiving antennas operating at 1.5 GHz with gains of 25 dB and 30 dB, respectively are separated by 1.5 km. If the transmitted power is 200 W, then the maximum power that can be received at receiver is given by _______mW.
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Jun 15ESE & GATE EC