AllInfoHub – MCQ Practice

Electromagnetics – Multiple Choice Questions (MCQs)

25. An antenna is a device that converts:
- A. Electrical energy into mechanical energy
- B. Mechanical energy into electrical energy
- C. Guided waves into space waves and vice-versa
- D. Space waves into guided waves
26. The radiation pattern of an isotropic antenna is a:
- A. Figure-eight
- B. Sphere
- C. Doughnut
- D. Hemisphere
27. The directivity of an antenna is a measure of its ability to:
- A. Transmit in all directions
- B. Receive signals from all directions
- C. Concentrate radiated power in a particular direction
- D. Minimize losses
28. Maxwell's equations are a set of ________ differential equations.
- A. Two
- B. Three
- C. Four
- D. Five
29. The curl of the electric field E is equal to:
- A. Negative time rate of change of magnetic flux density
- B. Time rate of change of magnetic flux density
- C. Magnetic flux density
- D. Current density
30. What is the primary function of a waveguide?
- A. To guide electromagnetic waves
- B. To store electric energy
- C. To generate electromagnetic waves
- D. To filter specific frequencies
31. Which mode of propagation is common in rectangular waveguides?
- A. TEM
- B. TE
- C. TM
- D. Both TE and TM
32. The cut-off frequency of a waveguide depends on:
- A. Its length
- B. Its material
- C. Its dimensions
- D. The operating frequency
33. Faraday's law of induction explains:
- A. Motional EMF
- B. Transformer EMF
- C. Both motional and transformer EMF
- D. Static EMF
34. Magnetic flux lines always form:
- A. Open loops
- B. Closed loops
- C. Straight lines
- D. Spiral paths
35. The electric susceptibility relates the electric field to the:
- A. Polarization
- B. Magnetic field
- C. Current density
- D. Permittivity
36. The magnetic field intensity H is related to the magnetic flux density B by:
- A. B = μH
- B. H = μB
- C. B = μ₀H
- D. H = μ₀B

« Prev 1 2 3 4 5 6 7 8 Next »

Electromagnetics – Multiple Choice Questions (MCQs)

25. An antenna is a device that converts:

26. The radiation pattern of an isotropic antenna is a:

27. The directivity of an antenna is a measure of its ability to:

28. Maxwell's equations are a set of ________ differential equations.

29. The curl of the electric field E is equal to:

30. What is the primary function of a waveguide?

31. Which mode of propagation is common in rectangular waveguides?

32. The cut-off frequency of a waveguide depends on:

33. Faraday's law of induction explains:

34. Magnetic flux lines always form:

35. The electric susceptibility relates the electric field to the:

36. The magnetic field intensity H is related to the magnetic flux density B by:

Quick Links