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ECE :: Radio Receivers

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

  2. A.
    Loudspeaker
    B.
    Frequency changer
    C.
    Demodulator
    D.
    Audio amplifier

  3. The IF stage of a receiver employs

  4. A.
    capacitive coupling
    B.
    impedance coupling
    C.
    double-tuned transformer coupling
    D.
    single-tuned transformer coupling

  5. A FM signal with modulation index Mf is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of

  6. A.
    Mf
    B.
    Mf/2
    C.
    2Mf
    D.
    UMf

  7. Double spotting in a receiver is due to

  8. A.
    poor sensitivity of RF amplifier
    B.
    high gain of IF amplifier
    C.
    inadequate image frequency rejection
    D.
    all of the above

  9. Three point tracking can be achieved with

  10. A.
    gang condenser
    B.
    variable selectivity
    C.
    paddar capacitor
    D.
    any of the above

  11. In a transistor receiver, the use of FET as the first stage amplifier is likely to

  12. A.
    improve selectivity of the receiver
    B.
    improve the effectiveness of the AGC
    C.
    reduce the effect of negative peak clipping
    D.
    reduce the effect of noise at all frequencies

  13. The household radio receiver uses

  14. A.
    synchronous
    B.
    envelope detector
    C.
    radio detector
    D.
    none of the above

  15. The source of which of the following noise is different from that of the remaining?

  16. A.
    Solar noise
    B.
    Cosmic noise
    C.
    Galactic noise
    D.
    Atmospheric noise

  17. A receiver having poor IF selectivity will also have poor

  18. A.
    sensitivity
    B.
    double spotting
    C.
    blocking
    D.
    all of the above

  19. Statement 1
    Diode is the most common device used for demodulation.
    Statement 2
    A discriminator is a FM detector.

  20. A.
    Statement 1 is true but statement 2 is false
    B.
    Statement 1 is false but statement 2 is true
    C.
    Both the statements are true
    D.
    Both the statements are false