- What is the primary function of an antenna?
A. To amplify signals
B. To convert electrical signals into electromagnetic waves and vice versa
C. To filter noise from a signal
D. To provide impedance matchingAnswer: B
- Which of the following is NOT a type of antenna?
A. Dipole antenna
B. Parabolic antenna
C. Quartz antenna
D. Loop antennaAnswer: C
- The radiation pattern of an antenna is a graphical representation of:
A. Power distribution as a function of distance
B. The impedance of the antenna
C. Power distribution as a function of direction
D. Frequency variation over timeAnswer: C
- The gain of an antenna is a measure of:
A. Efficiency of signal modulation
B. Ability to radiate energy in a specific direction
C. Total power output of the antenna
D. Frequency responseAnswer: B
- What does VSWR (Voltage Standing Wave Ratio) indicate in an antenna system?
A. Power gain of the antenna
B. Impedance matching quality
C. Radiation efficiency
D. Frequency rangeAnswer: B
- The directivity of an antenna refers to:
A. The maximum gain of the antenna
B. The ability to focus energy in a specific direction
C. The radiation resistance of the antenna
D. The bandwidth of the antennaAnswer: B
- Which type of antenna is commonly used in satellite communication?
A. Yagi-Uda antenna
B. Horn antenna
C. Parabolic reflector antenna
D. Dipole antennaAnswer: C
- A Yagi-Uda antenna is primarily used for:
A. High-gain applications in a specific direction
B. Omni-directional signal reception
C. Low-frequency transmission
D. Space communicationAnswer: A
- What is the typical radiation pattern of a dipole antenna?
A. Spherical
B. Figure-eight
C. Directional cone
D. IsotropicAnswer: B
- Which type of wave propagation is used for long-distance communication using the ionosphere?
A. Ground wave propagation
B. Sky wave propagation
C. Space wave propagation
D. Surface wave propagationAnswer: B
- Ground wave propagation is most effective for:
A. Low-frequency signals
B. High-frequency signals
C. Microwave signals
D. Satellite communicationAnswer: A
- In space wave propagation, the primary limitation is:
A. Atmospheric absorption
B. Line-of-sight requirement
C. Ionospheric reflection
D. Frequency shiftAnswer: B
- Which layer of the ionosphere is primarily responsible for reflecting radio waves back to Earth?
A. D layer
B. E layer
C. F layer
D. G layerAnswer: C
- The length of a half-wave dipole antenna is approximately equal to:
A. Wavelength of the signal
B. Half the wavelength of the signal
C. Quarter of the wavelength of the signal
D. Twice the wavelength of the signalAnswer: B
- The bandwidth of an antenna refers to:
A. The range of frequencies over which it operates effectively
B. The power it can radiate
C. The distance it can cover
D. Its impedance matching capabilityAnswer: A
- Which of the following antennas is used in Wi-Fi routers?
A. Horn antenna
B. Dipole antenna
C. Patch antenna
D. Parabolic antennaAnswer: C
- The concept of beamforming is used in antennas to:
A. Reduce interference
B. Focus the signal in a specific direction
C. Increase the antenna’s size
D. Improve impedance matchingAnswer: B
- Which type of wave propagation is dominant in mobile communication systems?
A. Ground wave propagation
B. Sky wave propagation
C. Space wave propagation
D. Tropospheric propagationAnswer: C
- Which of the following antennas is ideal for satellite TV reception?
A. Log-periodic antenna
B. Parabolic reflector antenna
C. Folded dipole antenna
D. Horn antennaAnswer: B
- Polarization of an antenna refers to the:
A. Shape of the antenna
B. Direction of the electric field of the radiated wave
C. Material used in the antenna design
D. Frequency of operationAnswer: B