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Home ‣ Electronics and Communication Engineering ‣ Radio Receivers Comments
  • Question

  • Fidelity of a receiver represents


  • Options
  • A. the sensitivity expressed in terms of voltage that must be applied to the receiver input to give a standard output
  • B. the extent to which the receiver is capable of distinguishing between the desired signal and other frequencies
  • C. the variation of the output with the modulation frequency when the output impedance is a resistance
  • D. none of the above

  • Correct Answer
  • the variation of the output with the modulation frequency when the output impedance is a resistance 

    • Radio Receivers problems

    Search Results

    • 1. In a receiver, which of the following device has RF input but IF output?

    • Options
    • A. Loudspeaker
    • B. Frequency changer
    • C. Demodulator
    • D. Audio amplifier
      • Discuss
    • 2. The selectivity curve of a standard receiver is represented by

    • Options
    • A. curve A
    • B. curve B
    • C. curve C
    • D. curve D
      • Discuss
    • 3. RF amplifiers are used in radio receivers for

    • Options
    • A. better sensitivity
    • B. improved signal-to-noise ratio
    • C. better coupling of receiver to the antenna
    • D. all of the above
      • Discuss
    • 4. When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. The image frequency is

    • Options
    • A. 555 kHz
    • B. 1010 kHz
    • C. 1465 kHz
    • D. 1920 kHz
      • Discuss
    • 5. Which of the following circuit cannot be used to demodulate SSB?

    • Options
    • A. Phase discriminator
    • B. Produce detector
    • C. Balanced modulator
    • D. Beat frequency oscillator
      • Discuss
    • 6. A receiver having an RF amplifier and an IF of 450 kHz, has Q of the coils 65 and an incoming frequency of 1200 kHz. The image rejection of the receiver is

    • Options
    • A. 5870
    • B. 3655
    • C. 236
    • D. 13.3
      • Discuss
    • 7. The source of which of the following noise is different from that of the remaining?

    • Options
    • A. Solar noise
    • B. Cosmic noise
    • C. Galactic noise
    • D. Atmospheric noise
      • Discuss
    • 8. The sensitivity of a superheterodyne receiver is determined by

    • Options
    • A. the gain IF amplifier
    • B. the gain of RF amplifier
    • C. the noise figure
    • D. all of the above
      • Discuss
    • 9. In a superheterodyne receiver, the IF stage has better selectivity than RF stage because

    • Options
    • A. of higher frequency
    • B. of lower frequency
    • C. of high L/C ratio
    • D. of constant passband
      • Discuss
    • 10. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The efficiency of detection is

    • Options
    • A. 34%
    • B. 55.5%
    • C. 68.8%
    • D. 84.7%
      • Discuss

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