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

  • 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

  • Correct Answer
  • all of the above 

    • Radio Receivers problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. The passband of the tuned circuits of a radio receiver should be equal to

    • Options
    • A. 20 kHz
    • B. 455 kHz
    • C. 1455 kHz
    • D. more than 455 kHz
      • Discuss
    • 4. Which curve represents the fidelity curve of a standard receiver?

    • Options
    • A. Curve A
    • B. Curve B
    • C. Curve C
    • D. Curve D
      • Discuss
    • 5. Selectivity varies with receiving frequency, frequency is raised.

    • Options
    • A. Somewhat better when the receiving frequency is raised
    • B. Somewhat better at intermediate frequency
    • C. Somewhat worse when the receiving frequency is lowered
    • D. Somewhat worse when the receiving frequency is raised
      • Discuss
    • 6. The selectivity curve of a standard receiver is represented by

    • Options
    • A. curve A
    • B. curve B
    • C. curve C
    • D. curve D
      • Discuss
    • 7. 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
    • 8. 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
      • Discuss
    • 9. 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
    • 10. 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

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