Power Gain MCQ’s

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This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Power Gain”.

1. What is the maximum power gain of antenna with radiation efficiency 98% and directive gain 1?
a) 0.98
b) 1.02
c) 1.98
d) 1

2. The radiation efficiency value is ______
a) 0
b) 1<η<∞
c) 0≤η≤1
d) ∞

3. Which of the following expression is correct for radiation efficiency?
a) \eta_r = \frac{P_r}{P_l}
b) \eta_r = \frac{P_r}{P_r-P_l}
c) \eta_r = \frac{P_r}{P_r+P_l}
d) \eta_r = \frac{P_l}{P_r+P_l}

4. The ratio of power radiated in a particular direction to the total input power of antenna is called as _____
a) Directive gain
b) Power gain
c) Directivity
d) Partial directivity

5. Which of the following represents the relation between maximum power gain and maximum directivity gain of the antenna?
a) Gpmax = ηrGdmax
b) Gpmax = ηr/Gdmax
c) ηr = \sqrt{(G_{pmax} G_{dmax})}
d) ηr = \frac{G_{dmax}+G_{pmax}}{G_{dmax}-G_{pmax}}

6. What is the maximum power gain when the radiation resistance is 72Ω, loss resistance is 8Ω and the maximum directive gain is 1.5?
a) 1.15
b) 1.35
c) 1.25
d) 1.53

7. The value of maximum power gain is always greater than or equal to the maximum directive gain.
a) True
b) False

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