Average Power MCQ Quiz - Objective Question with Answer for Average Power - Download Free PDF

Last updated on Apr 23, 2025

Latest Average Power MCQ Objective Questions

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Average Power Question 1:

A half wave length dipole antenna, with input impedance of 73 Ω is connected to a transmission line whose characteristics impedance is 50 Ω. Assume that the pattern of the antenna is given by U = B0 sin3θ and radiation efficiency is 50 %, then the maximum absolute gain of the antenna is ______.

Answer (Detailed Solution Below) 0.75 - 0.85

Average Power Question 1 Detailed Solution

Umax = B0

Prad=02π0πU(θ,ϕ)sinθd0dϕ

=2πB0=0πsin4θdθ=B0(3π24)

Directivity D0=4πUmaxPradc

=4πB0B0(3π2)×4=163π=1.697

Absolute gain Gabs = erecdD0

er = Reflection (mismatch) efficiency

ecd = radiation efficiency

ecd=50%=12er=(1|Γ|2)=(1|735073+50|2)

= 0.965

Gabs=(1.697)(12)(0.965)=0.818

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