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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. Which of the following are the types of FM Detectors
    2. A.
    Quadrature Detector
    B.
    Phase-Locked Loop (PLL) detector
    C.
    Foster-Seely Discriminator
    D.
    All the above

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  2. In _______ the sample values of the analog waveform are used to determine the width of the pulse signal
    3. A.
    PPM
    B.
    PWM
    C.
    PTM
    D.
    All the above

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  3. In _________ the analog sample values determine the position of a narrow pulse Relative to the clocking time
    4. A.
    PPM
    B.
    PWM
    C.
    PTM
    D.
    All the above

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  4. It is possible to obtain PPM from PWM by using a ________multivibrator circuit
    5. A.
    Astable
    B.
    Bistable
    C.
    Monostable
    D.
    None of these

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  5. The Modulation index of an AM Wave is changed from 0 to 1. The transmitted power is _________
    6. A.
    Unchanged
    B.
    Decreased by 50 %
    C.
    Doubled
    D.
    Increased by 50 %

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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.
    Decreased by 50 %
    C.
    Doubled
    D.
    Increased by 50 %

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  7. In Amplitude modulation, the modulation envelope has a peak value which is double the unmodulated carrier value. What is the value of modulation index?
    8. A.
    25%
    B.
    50%
    C.
    75%
    D.
    100%

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  8. Time division multiplexing is used in _______
    9. A.
    Analog circuit
    B.
    Digital circuit
    C.
    Modulation circuit
    D.
    Multiplier circuit

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  9. The modulator stage in a radio transmitter is normally
    10. A.
    Class A
    B.
    Class B
    C.
    Class AB
    D.
    Class C

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  10. Power in an FM signal is dependent on __________
    11. A.
    The amplitude of the carrier
    B.
    The frequency of the carrier
    C.
    Both amplitude & frequency of a carrier
    D.
    None of these

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