AllInfoHub – MCQ Practice

Electromagnetics – Multiple Choice Questions (MCQs)

49. The concept of 'group velocity' is relevant for:
- A. Monochromatic waves
- B. Dispersive media
- C. Non-dispersive media
- D. Static fields
50. The boundary condition for the normal component of the magnetic flux density at the interface between two media is that it is:
- A. Discontinuous
- B. Continuous
- C. Zero
- D. Infinite
51. A standing wave ratio (SWR) of 1 indicates:
- A. Total reflection
- B. Total transmission
- C. Partial reflection
- D. Lossy transmission
52. The cutoff wavelength of a waveguide is the wavelength above which:
- A. No propagation occurs
- B. Only TEM mode propagates
- C. Higher order modes propagate
- D. Attenuation is minimized
53. Which of the following is not a source of electromagnetic waves?
- A. Accelerating charges
- B. Oscillating currents
- C. Stationary charges
- D. Time-varying electric fields
54. Magnetic susceptibility is a measure of:
- A. How easily a material can be magnetized
- B. How easily a material conducts electricity
- C. How easily a material stores electric energy
- D. How much resistance a material offers
55. The term 'magnetic flux' is measured in:
- A. Tesla
- B. Weber
- C. Henry
- D. Ampere
56. The energy density in an electric field is given by:
- A. ½εE²
- B. ½μH²
- C. εE
- D. μH
57. The energy density in a magnetic field is given by:
- A. ½μH²
- B. ½εE²
- C. μH
- D. εE
58. The force between two parallel current-carrying conductors is:
- A. Attractive if currents are in the same direction
- B. Repulsive if currents are in the same direction
- C. Always attractive
- D. Always repulsive
59. The curl of the magnetic field H is equal to:
- A. Current density J
- B. Current density J plus time rate of change of displacement D
- C. Zero
- D. Magnetic flux density B
60. Skin effect causes the current to flow mostly on the ________ of the conductor at high frequencies.
- A. Center
- B. Surface
- C. Entire cross-section
- D. Ends

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Electromagnetics – Multiple Choice Questions (MCQs)

49. The concept of 'group velocity' is relevant for:

50. The boundary condition for the normal component of the magnetic flux density at the interface between two media is that it is:

51. A standing wave ratio (SWR) of 1 indicates:

52. The cutoff wavelength of a waveguide is the wavelength above which:

53. Which of the following is not a source of electromagnetic waves?

54. Magnetic susceptibility is a measure of:

55. The term 'magnetic flux' is measured in:

56. The energy density in an electric field is given by:

57. The energy density in a magnetic field is given by:

58. The force between two parallel current-carrying conductors is:

59. The curl of the magnetic field H is equal to:

60. Skin effect causes the current to flow mostly on the ________ of the conductor at high frequencies.

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