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  • Question

  • When fs is the signal frequency and fi is the intermediate frequency, then image frequency fsi is given by


  • Options
  • A. fsi = fs - 2fi
  • B. fsi = fs + 2fi
  • C. When fs is the signal frequency and fi is the intermediate frequency, then image frequency fsi is gi
  • D. When fs is the signal frequency and fi is the intermediate frequency, then image frequency fsi is gi

  • Correct Answer
  • fsi = fs + 2fi  

    • Radio Receivers problems

    Search Results

    • 1. Modulated carrier power in FM

    • Options
    • A. increases with modulating signal power
    • B. decreases with modulating signal power
    • C. is independent of the modulating signal power
    • D. none
      • Discuss
    • 2. A heterodyne frequency changer is called a

    • Options
    • A. Modulator
    • B. Mixer
    • C. Demodulator
    • D. Frequency translator
      • Discuss
    • 3. The output of a diode detector contains

    • Options
    • A. D.C. voltage
    • B. modulating signal
    • C. RF ripple
    • D. all of the above
      • Discuss
    • 4. Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?

    • Options
    • A. Variable selectivity
    • B. Variable sensitivity
    • C. Double conversion
    • D. Squelch
      • Discuss
    • 5. RF amplifiers are used in radio receivers for

    • Options
    • A. improved image frequency rejection
    • B. improved rejection of adjacent unwanted signals
    • C. prevention of re-radiation of the local oscillator through the antenna of the receiver
    • D. all of the above
      • Discuss
    • 6. As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?

    • Options
    • A. High gain and better sensitivity
    • B. Better selectivity at high frequencies
    • C. Stability
    • D. Noise suppression
      • Discuss
    • 7. Padders are used in a receiver to

    • Options
    • A. discard the carrier
    • B. facilitate tracking
    • C. filter the input signal
    • D. suppress noise
      • Discuss
    • 8. Most popular IF for receivers tuning to 540 to 1650 kHz is

    • Options
    • A. 433 kHz
    • B. 455 kHz
    • C. 545 kHz
    • D. 555 kHz
      • Discuss
    • 9. In a ratio detector

    • Options
    • A. the linearity is worse than in a phase discriminator
    • B. the output is twice that obtainable from a similar phase discriminator
    • C. stabilization against signal strength variations is provided
    • D. the circuit is the same as in a discriminator, except that the diodes are reversed
      • Discuss
    • 10. Standard AM radio broadcasts are confined to

    • Options
    • A. MF
    • B. HF
    • C. VHF
    • D. UHF
      • Discuss

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