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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. MTSO stands for

    2. A.
    Metropolitan Telecommunication Subscribers Office
    B.
    Metropolitan Telecommunication Switching Office
    C.
    Mobile Telecommunication Switching Office
    D.
    Mobile Telecommunication Subscriber Office

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  2. The main advantage of TDM over FDM is that it

    3. A.
    needs less power
    B.
    needs less bandwidth
    C.
    needs simple circuitry
    D.
    gives better S/N ratio

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  3. VLF waves are sometimes used because

    4. A.
    they penetrate the ionosphere easily
    B.
    they are very reliable
    C.
    they require low power
    D.
    they require transmitting antennas of convenient sizes

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  4. If N is the number of binary digits needed to assign individual binary code designations to the M quantization levels, the signal to quantization noise ratio S0/Nq in PCM is

    5. A.
    2N
    B.
    22N
    C.
    D.
    24N

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  5. Which of the following is very useful as multiband HF receiving antenna?

    6. A.
    Square loop
    B.
    Conical horn
    C.
    Folded dipole
    D.
    Log-periodic

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  6. If Vs is signal voltage, Vn is noise voltage, signal to noise ratio S/N is defined as

    7. A.
    B.
    C.
    D.
    none of the above

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  7. Tuned voltage amplifiers are not used

    8. A.
    in public address systems
    B.
    in radio receivers
    C.
    in television receivers for sound signals
    D.
    in television receivers for video signals

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  8. If B is the bandwidth, the thermal noise voltage is proportional to

    9. A.
    B
    B.
    B0.5
    C.
    B1.5
    D.
    B2

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  9. ARQ stands for

    10. A.
    Automatic Repeat Quest
    B.
    Analog Repeat Request
    C.
    Automatic Repeat Request
    D.
    None Of the above

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  10. In FM noise can be decreased by a feature that AM does not have

    11. A.
    increasing deviation
    B.
    decreasing deviation
    C.
    reducing modulation index
    D.
    increasing modulation index

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