Explore topic-wise MCQs in Antennas.

This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Antennas knowledge and support exam preparation. Choose a topic below to get started.

1.

For duct propagation the necessary condition is \(\frac{dμ}{dh}\) is always +ve.

A. False
B. True
Answer» B. True
Discussion
2.

The wavelength of the EM signal propagation in the T.I.L for duct propagation is _________

A. \(λ=2.5h_d \sqrt{∆μ×10^{-6}} \)
B. \(λ=2.5h_d \sqrt{∆μ×10^6} \)
C. \(λ=5.2h_d \sqrt{∆μ×10^{-6}} \)
D. \(λ=25h_d \sqrt{∆μ×10^{-6}} \)
Answer» B. \(λ=2.5h_d \sqrt{∆μ×10^6} \)
Discussion
3.

Condition for duct propagation is _________

A. \(\frac{dμ}{dh}\) is -ve
B. \(\frac{dμ}{dh}\) is +ve
C. \(\frac{dμ}{dh}\) is zero
D. \(\frac{dμ}{dh}\) is unity
Answer» B. \(\frac{dμ}{dh}\) is +ve
Discussion
4.

Refractive index of temperature inversion layer is ____________

A. μ = (n-1+h/r)×106
B. μ = (n+1+h/r)×106
C. μ = (n-1-h/r)×106
D. μ = (n-1-h/r)×106
Answer» B. μ = (n+1+h/r)×106
Discussion
5.

How long the waves due to duct propagation travel following the earth curvature?

A. 1000km
B. 50m
C. 15m
D. 5000km
Answer» B. 50m
Discussion
6.

In which of the following propagation temperature inversion layer is present?

A. Duct wave propagation
B. Sky wave propagation
C. Tropospheric scattering wave propagation
D. Space wave propagation
Answer» B. Sky wave propagation
Discussion
7.

Temperature inversion layer occurs due to _____

A. Super refraction
B. Reflection
C. Diffraction
D. Increase in altitude
Answer» B. Reflection
Discussion
8.

Duct propagation is due to which layer?

A. Temperature Inversion layer
B. Higher atmospheric layer
C. Ionospheric layer
D. Surface water
Answer» B. Higher atmospheric layer
Discussion