BEE Bachelor of Electrical Engineering Electromagnetic Fields and Waves Questions and Answers

Question 1

An electromagnetic plane wave propagates from a lossless medium into a lossy medium. Which of the following effects is expected to occur?

Accepted Answer

The wave's amplitude will attenuate as it travels through the lossy medium.

Answer

The wave's frequency will decrease.

Answer

The wave will speed up significantly.

Answer

The wave's polarization will rotate by 90 degrees.

Question 2

A transmission line with a characteristic impedance of 50 Ω is terminated with a load impedance of 100 Ω. What is the Voltage Standing Wave Ratio (VSWR) on the line?

Accepted Answer

2.0

Answer

1.5

Answer

0.5

Answer

0.333

Question 3

Which of Maxwell's equations states that magnetic monopoles do not exist and that magnetic field lines must form closed loops?

Accepted Answer

Gauss's Law for Magnetism

Answer

Faraday's Law of Induction

Answer

Ampère-Maxwell Law

Answer

Gauss's Law

Question 4

In a hollow rectangular waveguide, which mode of propagation is characterized by having no electric field component in the direction of wave propagation and is typically the dominant mode?

Accepted Answer

Transverse Electric (TE)

Answer

Transverse Magnetic (TM)

Answer

Transverse Electromagnetic (TEM)

Answer

Longitudinal Mode (LM)

Question 5

An engineer is designing a high-frequency circuit on a printed circuit board (PCB). As the frequency of the signals increases, the current tends to flow only near the surface of the copper traces. What is this phenomenon called?

Accepted Answer

Skin Effect

Answer

Hall Effect

Answer

Proximity Effect

Answer

Faraday Effect

Question 6

Which of the following describes the boundary condition for the tangential component of the electric field (E-field) at the surface of a perfect electrical conductor (PEC)?

Accepted Answer

It must be zero.

Answer

It is equal to the surface charge density.

Answer

It is continuous and non-zero across the boundary.

Answer

It is perpendicular to the surface.