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ECE :: Radio Receivers

Radio Receivers - Section 1
Radio Receivers - Section 2

  1. Which are the popular IF frequencies for microwave and radar receivers operating on frequencies in the range 1 to 10 GHz

    2. A.
    30, 60 and 70 kHz
    B.
    3, 6 and 7 kHz
    C.
    30, 60 and 70 MHz
    D.
    3, 6 and 7 GHz

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  2. In a ratio detector

    3. 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

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  3. Neutralization is used in RF amplifiers to

    4. A.
    stop oscillation
    B.
    increase bandwidth
    C.
    improve selectivity
    D.
    all of the above

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

    5. A.
    fsi = fs - 2fi
    B.
    fsi = fs + 2fi
    C.
    D.

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  5. It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude

    6. A.
    will increase
    B.
    will decrease
    C.
    will remain constant
    D.
    will reduce to negligible value

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

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

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  7. Transistor are free from which type of noise?

    8. A.
    Resistance noise
    B.
    Partition noise
    C.
    Flicker noise
    D.
    Shot noise

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  8. Standard AM radio broadcasts are confined to

    9. A.
    MF
    B.
    HF
    C.
    VHF
    D.
    UHF

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  9. In a radio receiver with simple AGC

    10. A.
    the highest AGC voltage is produced between stations
    B.
    the faster the AGC time constant, the more accurate the output
    C.
    an increase in signal strength produces more AGC
    D.
    the audio stage gain is normally controlled by AGC

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  10. Which of the following cannot be used to demodulate SSB?

    11. A.
    Complete phase-shift generator
    B.
    Product detector
    C.
    Diode balanced modulator
    D.
    Bipolar transistor balanced modulator

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