# Reflection Factor for Parallel Propagation MCQ’s

This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Reflection Factor for Parallel Propagation”.

1. What is the reflection coefficient for a perfect reflecting surface?
a) 1
b) 0
c) <1
d) >1

2. What is the reflection coefficient if there are no any reflections?
a) 1
b) 0
c) <1
d) >1

3. The reflection factor is given by the ratio of ____________
a) Reflected wave to incident wave
b) Incident wave to reflected wave
c) Sum of reflected and incident waves to difference of reflected and incident waves
d) Difference of reflected and incident waves to sum of reflected and incident waves

4. Which of the following holds true for Brewster angle?
a) It is about the angle of reflection
b) It is the angle of incident at which no reflections occur
c) It is the angle of incident at which maximum reflections occur
d) It is about the angle of refraction

5. Relation between transmission coefficient γt and reflection coefficient is γr is
a) γr= γt-1
b) γr= γt+1
c) γr= γt-2
d) γr= (γt-1) / γt+1

6. Complex dielectric constant of earth is given by ____
a) ϵ’=ϵ+\frac{σ}{jw}
b) ϵ’=σϵ+\frac{1}{jw}
c) ϵ’=σ+\frac{ϵ}{jw}
d) ϵ’=ϵ+\frac{σϵ}{jw}

7. Reflection coefficient of plane waves with normal incidence in terms of impedances of medium is ____
a) γ_r=\frac{η_2-η_1}{η_2+η_1}
b) γ_r=\frac{2η_2}{η_2+η_1}
c) γ_r=\frac{2η_1}{η_2+η_1}
d) γ_r=\frac{η_2+η_1}{η_2-η_1}

8. Transmission coefficient of a plane wave with normal incidence is _________
a) γ_t=\frac{2η_2}{η_2+η_1}
b) γ_t=\frac{η_2}{η_2+η_1}
c) γ_t=\frac{2η_2}{η_2+η_1}
d) γ_r=\frac{η_2-η_1}{η_2+η_1}

9. Which of the following is the expression for tilt angle?
a) θ=1/2 tan^{-1}⁡(\frac{σ}{ωϵ})
b) θ=2 tan^{-1}⁡(\frac{σ}{ωϵ})
c) θ=1/2 tan^{-1}⁡(\frac{σϵ}{ω})
d) θ=2 tan^{-1}⁡(\frac{wϵ}{σ})

10. Brewster angle doesn’t exist for perpendicular polarization.
a) True
b) False

11. Find the tilt angle of the radio wave with 1MHz frequency and conductivity of earth is 5 ×10-3S/m and relative permittivity 10?
a) 41.8°
b) 83.6°
c) 48.1°
d) 38.6° 5 Star
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