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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. TV receivers use flyback switched mode power supply because

    2. A.
    it can supply many voltage outputs
    B.
    it does not require a filter choke and is cheap
    C.
    it has very good regulation at all loads
    D.
    both (a) and (c)

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  2. SSB stands for

    3. A.
    Single Side Band
    B.
    Suppressed Side Band
    C.
    Single Sound Band
    D.
    Single Sky Band

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  3. Assertion (A): In SSB, carrier is suppressed by about 45 dB

    Reason (R): SSB is standard form for radio communication

    4. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is correct but R is wrong
    D.
    A is wrong but R is correct

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  4. For a parallel two wire line with both conductors touching each other, the characteristic impedance is about

    5. A.
    300 Ω
    B.
    200 Ω
    C.
    80 Ω
    D.
    24 Ω

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  5. Tape recorders use

    6. A.
    cone type loudspeakers
    B.
    horn type loudspeakers
    C.
    either cone type or horn type loudspeakers
    D.
    none of the above

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  6. If f is frequency and d is distance, path attenuation a between isotropic antennas is given by

    7. A.
    a = 33 + 20 log f + 20 log d
    B.
    a = 100 + 33 log f + 33 log d
    C.
    D.

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  7. In a FM signal, the modulation index increases, then the power

    8. A.
    increases
    B.
    decreases
    C.
    remains constant
    D.
    none of the above

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  8. Higher order TDM levels are obtained by

    9. A.
    forming super master groups
    B.
    using A law
    C.
    using μ law
    D.
    dividing pulse width

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  9. Assertion (A): In AM, use of SSB reduces the power and bandwidth requirement

    Reason (R): A balanced modulator produces AM with carrier suppressed

    10. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is correct but R is wrong
    D.
    A is wrong but R is correct

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  10. Limiter is not essential in the following detector

    11. A.
    foster-Seeley
    B.
    ratio detector
    C.
    balanced
    D.
    none of the above

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