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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 microphones works on the principle of Faraday's law?

    2. A.
    Carbon
    B.
    Condenser
    C.
    Moving coil
    D.
    Electret

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  2. In a CE amplifier connection, the emitter is at ground potential for

    3. A.
    AC quantities
    B.
    DC quantities
    C.
    all quantities
    D.
    none of the quantities

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  3. In an AM wave with m = 1, the carrier is suppressed. The resulting power saving will be

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  4. Directive gain is

    5. A.
    a power ratio
    B.
    a voltage ratio
    C.
    a current ratio
    D.
    a distance ratio

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  5. Which of the following sampling frequencies is considered adequate in voice telephony?

    6. A.
    4 kHz
    B.
    8 kHz
    C.
    16 kHz
    D.
    32 kHz

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  6. In equally tampered scale, frequency of each tone equals the frequency of lower adjacent tone multiplied by

    7. A.
    (2)1/7
    B.
    (2)1/12
    C.
    (2)1/6
    D.
    (2)1/5

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  7. A carrier is modulated by two modulating waves A and B having modulation indices of 0.6 and 0.8 respectively. The overall modulation index is

    8. A.
    1
    B.
    0.7
    C.
    0.2
    D.
    1.4

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  8. A communication channel disturbed by additive white, Gaussian noise has a bandwidth of 4 kHz and SNR of 15. The highest transmission rate that this channel can support (in k bits/sec) is

    9. A.
    16
    B.
    1.6
    C.
    3.2
    D.
    60

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  9. Which of the following microphones is used as a standard for calibration?

    10. A.
    Moving coil
    B.
    Carbon
    C.
    Condenser
    D.
    Ribbon

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  10. The reactance of coupling capacitor for AC signals in an amplifier, should be

    11. A.
    as low as possible
    B.
    as high as possible
    C.
    neither low nor high
    D.
    either low or high

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