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ECE :: Communication Systems

Communication Systems - Section 1
Communication Systems - Section 2
Communication Systems - Section 3
Communication Systems - Section 4
Communication Systems - Section 5
Communication Systems - Section 6
Communication Systems - Section 7
Communication Systems - Section 8
Communication Systems - Section 9
Communication Systems - Section 10
Communication Systems - Section 11
Communication Systems - Section 12
Communication Systems - Section 13
Communication Systems - Section 14
Communication Systems - Section 15
Communication Systems - Section 16
Communication Systems - Section 17
Communication Systems - Section 18
Communication Systems - Section 19
Communication Systems - Section 20
Communication Systems - Section 21
Communication Systems - Section 22
Communication Systems - Section 23
Communication Systems - Section 24
Communication Systems - Section 25
Communication Systems - section-26
Communication Systems - Section-27

  1. What is the RF amplifier plate voltage when the audio-modulating voltage is +600 V?

    2. A.
    -600 V
    B.
    Zero
    C.
    600 V
    D.
    1200 V

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  2. FM has

    3. A.
    two sidebands only
    B.
    four sidebands only
    C.
    eight sidebands only
    D.
    infinite sidebands

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  3. The service area of a TV transmitter is a little beyond radio horizon.

    4. A.
    True
    B.
    False

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  4. If carrier power is P and amplitude modulation index is m, the total power after modulation is

    5. A.
    P
    B.
    mP
    C.
    P(1 + m)
    D.

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  5. Bit is a unit of

    6. A.
    entropy
    B.
    information
    C.
    channel capacity
    D.
    rate of information

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  6. The modulation index of an AM wave is changed from 0 to 1. The transmitted power is

    7. A.
    unchanged
    B.
    halved
    C.
    increased by 50%
    D.
    quadrupled

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  7. In a radio receiver the input from local oscillator is fed to

    8. A.
    RF amplifier
    B.
    mixer
    C.
    IF amplifier
    D.
    detector

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  8. A shadow zone does not receive any space wave

    9. A.
    True
    B.
    False

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  9. A radio frequency signal contains the following three frequencies :
    850 kHz; 865 kHz and 875 kHz
    In order to amplify this signal, which of the following amplifier should be selected?

    10. A.
    Push pull amplifier
    B.
    Wideband amplifier
    C.
    Audio frequency amplifier
    D.
    Tuned voltage amplifier

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  10. Which of the following pulse-time modulation is least used?

    11. A.
    PDM
    B.
    PPM
    C.
    PWM
    D.
    PAM

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