Antenna Systems Quiz

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Questions and Answers

What type of antenna radiates equally in all directions?

  • Vertical Antenna
  • Isotropic Antenna (correct)
  • Horizontal Antenna
  • Dipole Antenna

What does the power pattern of an antenna provide information about?

  • The antenna's directivity
  • The antenna's gain
  • The antenna's coverage (correct)
  • The wavelength of a wave

In which direction is the radiation strongest from a half-wave dipole antenna in free space?

  • Off the ends of the antenna
  • In the direction of the feed line
  • Equally in all directions
  • Broadside to the antenna (correct)

What does a waveguide convert electrical energy travelling along a transmission line into?

<p>Electromagnetic waves in space (D)</p> Signup and view all the answers

What is the term for the ratio of the maximum radiation intensity in a given direction to the radiation intensity averaged over all directions?

<p>Directivity (C)</p> Signup and view all the answers

What is the wavelength of a wave in a waveguide proportional to?

<p>Waveguide dimensions and phase velocity (B)</p> Signup and view all the answers

What is the purpose of a reflector element in a Yagi-Uda antenna system?

<p>To direct signals back towards the interference (C)</p> Signup and view all the answers

Which of the following statements about impedance matching in antenna systems is true?

<p>Impedance matching ensures maximum power transfer between the receiving antenna and transmission line. (B)</p> Signup and view all the answers

What is the radiation characteristic of a dipole antenna?

<p>Omnidirectional (B)</p> Signup and view all the answers

What is the best solution to fading in antenna systems?

<p>Space diversity (C)</p> Signup and view all the answers

What is often used for satellite communication due to its ability to focus signals in a specific direction?

<p>Parabolic antenna (C)</p> Signup and view all the answers

What does impedance matching primarily ensure in an antenna system?

<p>Maximum power transfer only (D)</p> Signup and view all the answers

In the 1496/1596 IC balanced modulator, what is the principal circuit used?

<p>Vestigial Sideband (D)</p> Signup and view all the answers

What does Vm > Vc represent in the context of modulation?

<p>Active Modulation (C)</p> Signup and view all the answers

Which device is commonly used in SSB generators for filtering?

<p>Crystals (A)</p> Signup and view all the answers

What is the primary function of a bridge in modulation circuits?

<p>Baseband reorientation (B)</p> Signup and view all the answers

Which modulation type involves Letter A from the given options?

<p>Amplitude Modulation (C)</p> Signup and view all the answers

What does Vm = Vc = 0 represent in the context of modulation?

<p>Distance measurement (B)</p> Signup and view all the answers

What is considered as the first detector in superheterodyne?

<p>IF Amplifier (A)</p> Signup and view all the answers

What is the primary purpose of modulation in communication?

<p>Increase signal power (D)</p> Signup and view all the answers

In Amplitude Modulation (AM), what does the amplitude of the carrier signal represent?

<p>Signal amplitude (C)</p> Signup and view all the answers

What produces the sidebands on Frequency Modulation (FM)?

<p>The frequency of the modulating signal (A)</p> Signup and view all the answers

What does the term 'quadrature' refer to in Quadrature Amplitude Modulation (QAM)?

<p>The process of impressing intelligence on the carrier (C)</p> Signup and view all the answers

Which best describes the function of the intermediate frequency (IF) stage in a superheterodyne receiver?

<p>The IF stage amplifies the received radio signal before demodulation (C)</p> Signup and view all the answers

What type of transmission line is commonly used for high frequency signals, such as radio frequency (RF) signals?

<p>Coaxial cable (A)</p> Signup and view all the answers

What is the significance of the term 'standing wave ratio (SWR)' in the context of transmission lines?

<p>It indicates how well impedance is matched (A)</p> Signup and view all the answers

What does the radius of the circle you draw on a Smith Chart represent?

<p>Impedance (A)</p> Signup and view all the answers

In a loss-less transmission line, what will be the input impedance for a λ/8 long short circuit section?

<p>$0$ ohms (A)</p> Signup and view all the answers

Which type of code is currently used in PCM (Pulse Code Modulation)?

<p>Gray code (B)</p> Signup and view all the answers

What happens to a positive voltage pulse sent down a transmission line terminated with its characteristic impedance?

<p>It reflects back with no distortion (A)</p> Signup and view all the answers

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