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

85. The polarization of an electromagnetic wave is said to be linear if the tip of the electric field vector traces a:
- A. Circle
- B. Ellipse
- C. Straight line
- D. Spiral
86. The polarization of an electromagnetic wave is said to be circular if the tip of the electric field vector traces a:
- A. Circle
- B. Ellipse
- C. Straight line
- D. Spiral
87. The concept of 'effective length' of an antenna is related to its:
- A. Input impedance
- B. Radiation pattern
- C. Voltage induced by an incident field
- D. Current distribution
88. The maximum usable frequency (MUF) in ionospheric propagation is determined by the:
- A. Critical frequency and angle of incidence
- B. Transmitter power
- C. Antenna gain
- D. Receiver sensitivity
89. Ground waves are primarily used for communication at ________ frequencies.
- A. High
- B. Very high
- C. Low
- D. Ultra high
90. The phenomenon of 'tropospheric scatter' is used for communication beyond the line of sight in the ________ frequency range.
- A. HF
- B. VHF/UHF
- C. Microwave
- D. Optical
91. The integral of current density J over a surface is equal to the:
- A. Total charge enclosed
- B. Total current passing through the surface
- C. Magnetic flux
- D. Electric flux
92. The concept of 'retarded potentials' is used when dealing with:
- A. Static fields
- B. Time-varying fields
- C. DC circuits
- D. AC circuits
93. The fundamental difference between good conductors and good dielectrics lies in their:
- A. Permittivity
- B. Permeability
- C. Conductivity
- D. Loss tangent
94. A perfectly conducting plane acts as a perfect reflector of electromagnetic waves due to the boundary condition that the tangential electric field is:
- A. Zero
- B. Infinite
- C. Continuous
- D. Discontinuous
95. The term 'impedance matching' in transmission lines is crucial for:
- A. Maximizing power transfer
- B. Minimizing reflections
- C. Reducing standing waves
- D. All of the above
96. The skin effect causes current to flow predominantly near the ________ of the conductor at high frequencies.
- A. Center
- B. Surface
- C. Entire cross-section
- D. Ends

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AllInfoHub – MCQ Practice

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

85. The polarization of an electromagnetic wave is said to be linear if the tip of the electric field vector traces a:

86. The polarization of an electromagnetic wave is said to be circular if the tip of the electric field vector traces a:

87. The concept of 'effective length' of an antenna is related to its:

88. The maximum usable frequency (MUF) in ionospheric propagation is determined by the:

89. Ground waves are primarily used for communication at ________ frequencies.

90. The phenomenon of 'tropospheric scatter' is used for communication beyond the line of sight in the ________ frequency range.

91. The integral of current density J over a surface is equal to the:

92. The concept of 'retarded potentials' is used when dealing with:

93. The fundamental difference between good conductors and good dielectrics lies in their:

94. A perfectly conducting plane acts as a perfect reflector of electromagnetic waves due to the boundary condition that the tangential electric field is:

95. The term 'impedance matching' in transmission lines is crucial for:

96. The skin effect causes current to flow predominantly near the ________ of the conductor at high frequencies.

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