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GATE EC 2020: Electromagnetic Theory Quiz 11 (App update required to attempt this test)

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Question 1

An antenna has a radiation resistance of 50 Ω and a loss resistance of 10 Ω. If the power gain of antenna is 20, the directive gain of the antenna is given by

Question 2

An antenna has a single main lobe pointing in the y-direction.The half power beam widths in Z and x directions are 300 and 300 respectively. The approximate Directivity of the antenna is

Question 3

For an 8 feet (2.4 m) parabolic disk antenna operating at 4 GHz, the minimum distance required for far field measurement is closest to

Question 4

The normalized radiation intensity of an antenna in spherical coordinates is given by
U = sin sin,

The directivity of antenna is given by _______.

Question 5

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.

Question 6

If directive gain of a half wave dipole is 2.64 W/W, and ohmic losses is 8Ω, then determine its power gain(in dB).
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Dec 8ESE & GATE EC