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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. At a given probability of error, binary coherent FSK is interior to binary coherent PSK by

    2. A.
    6 dB
    B.
    3 dB
    C.
    2 dB
    D.
    0 dB

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  2. In a TV receiver the video IF amplifier provides a gain of about

    3. A.
    5 dB
    B.
    20 dB
    C.
    60 dB
    D.
    200 dB

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  3. Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?

    4. A.
    VSB
    B.
    DSB-SC
    C.
    SSB
    D.
    AM

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  4. Switching systems

    5. A.
    are limited to small data networks
    B.
    require additional lines
    C.
    are not used in data system
    D.
    improve the efficiency of data transfer

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  5. Which one of the following statements is wrong. The radar cross-section of a target?

    6. A.
    depends on frequency
    B.
    may be reduced by special coating of non-spherical target
    C.
    depends on the aspect of target if it is non-spherical
    D.
    is equal to actual cross-sectional area for small targets

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

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

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  7. The power required to produce a gain of 10 dB over 4 W of original power is __________ watt.

    8. A.
    80
    B.
    40
    C.
    0.4
    D.
    8

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  8. Noise figure is defined as

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  9. The inductance of connecting leads can be a source of

    10. A.
    low frequency parasitics
    B.
    high frequency parasitics
    C.
    carrier frequency parasitics
    D.
    none of the above

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  10. For F2 layer the critical frequency is about

    11. A.
    500 MHz
    B.
    100 MHz
    C.
    25 MHz
    D.
    10 MHz

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