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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 form of angle modulation in this? If e = 10 sin(108 t + 3 sin 104 t)

    2. A.
    AM
    B.
    FM
    C.
    AM or FM
    D.
    AM or PCM

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  2. The noise performance of a square law demodulator of AM signal is

    3. A.
    better than that of an envelope detector
    B.
    better than that of a synchronous detector
    C.
    identical with that of a synchronous detector
    D.
    poorer than that of an envelope detector

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  3. In AM the amplitude of carrier components ... while in FM it

    4. A.
    remains constant, does not remain constant
    B.
    does not remain constant ... remains constant
    C.
    remains constant... also remains constant
    D.
    does not remain constant, also does not remain constant

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  4. In a colour TV receiver, the function of comb filter is

    5. A.
    to pass only the clusters of monochrome signal energy while blocking chrome signals
    B.
    to pass only chrome signals and block monochrome signals
    C.
    to block both monochrome and chrome signals
    D.
    none of the above

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  5. A communication receiver is

    6. A.
    TRF receiver
    B.
    a superheterodyne receiver
    C.
    either (a) or (b)
    D.
    neither (a) nor (b)

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  6. In PCM, bit duration is defined as

    7. A.
    B.
    C.
    sampling period x total no. of bits
    D.
    none of these

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  7. Assertion (A): If frequency is high, the distance between transmitter and antenna may be an appreciable fraction of wavelength

    Reason (R): Wavelength is inversely proportional to frequency.

    8. 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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  8. Speeds of sound and radio waves are equal.

    9. A.
    True
    B.
    False

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  9. When Pc is the unmodulated carrier power and Pt is the total power in the modulated wave, then the maximum power in AM wave is

    10. A.
    Pt = 1.5 Pc
    B.
    Pt = 2.5 Pc
    C.
    Pt = 2
    D.
    Pt = 22 Pc

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  10. Thermal noise is passed through an ideal low pass filter having cut off at fc = ω Hz. The auto-correlation value of the noise at the output of the filter is given as

    11. A.
    a delta function at t = 0
    B.
    gaussian over the range -∞ ≤ t ≤ ∞
    C.
    sin c function over the range -∞ ≤ t ≤ ∞
    D.
    triangular function over the range

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