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Electromagnetics (ECE Perspective) – Multiple Choice Questions (MCQs)

61. In free space
- A. electromagnetic waves are:
- B. Longitudinal
- C. Transverse
- D. Both longitudinal and transverse
62. The velocity of propagation of an electromagnetic wave in a lossless dielectric medium is less than the speed of light in vacuum because of the material's:
- A. Resistance
- B. Permittivity and permeability
- C. Conductivity
- D. Density
63. Which of the following is an active element in electromagnetics?
- A. Resistor
- B. Inductor
- C. Antenna
- D. Capacitor
64. The electric potential due to an electric dipole falls off as:
- A. 1/r
- B. 1/r²
- C. 1/r³
- D. 1/r⁴
65. The magnetic field due to a magnetic dipole falls off as:
- A. 1/r
- B. 1/r²
- C. 1/r³
- D. 1/r⁴
66. The wave equation for electric field E in a source-free region is:
- A. ∇²E = 0
- B. ∇²E = μ∂²E/∂t²
- C. ∇²E = μ∂E/∂t
- D. ∇²E = ε∂E/∂t
67. The cutoff frequency of a waveguide depends on its:
- A. Length
- B. Material
- C. Dimensions
- D. Operating frequency
68. For TEM (Transverse Electromagnetic) waves
- A. both E and H fields are ________ to the direction of propagation.
- B. Parallel
- C. Perpendicular
- D. At 45 degrees
69. TEM waves can propagate in:
- A. Rectangular waveguides
- B. Circular waveguides
- C. Coaxial cables
- D. Parallel plate waveguides
70. The phenomenon of 'group velocity' in a dispersive medium refers to the velocity of the:
- A. Individual wave components
- B. Envelope of the wave packet
- C. Phase of the wave
- D. Signal components
71. The Smith Chart is used for solving problems related to:
- A. Power calculations
- B. Transmission lines
- C. Antenna design
- D. Filter design
72. Moving from an inductive region towards the load on a Smith chart corresponds to moving:
- A. Clockwise
- B. Counter-clockwise
- C. Along a constant VSWR circle
- D. Along a constant resistance circle

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Electromagnetics (ECE Perspective) – Multiple Choice Questions (MCQs)

61. In free space

62. The velocity of propagation of an electromagnetic wave in a lossless dielectric medium is less than the speed of light in vacuum because of the material's:

63. Which of the following is an active element in electromagnetics?

64. The electric potential due to an electric dipole falls off as:

65. The magnetic field due to a magnetic dipole falls off as:

66. The wave equation for electric field E in a source-free region is:

67. The cutoff frequency of a waveguide depends on its:

68. For TEM (Transverse Electromagnetic) waves

69. TEM waves can propagate in:

70. The phenomenon of 'group velocity' in a dispersive medium refers to the velocity of the:

71. The Smith Chart is used for solving problems related to:

72. Moving from an inductive region towards the load on a Smith chart corresponds to moving:

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