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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. A bit synchronizer regenerates at the receiver a clock waveform which is

    2. A.
    synchronous with original clock waveform
    B.
    out of phase by 180° with original clock waveform
    C.
    out of phase by 90° with the original clock waveform
    D.
    none of the above

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  2. Probability of error in DPSK is less than PSK

    3. A.
    true
    B.
    false
    C.
    equal
    D.
    depend upon noise

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  3. Two sine waves of amplitude A1 and A2 are multiplied. The amplitude of the spectral component is

    4. A.
    B.
    A1A2
    C.
    D.
    (A1A2)1/2

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  4. In radar display system PPI stands for

    5. A.
    Pulse Position Indicator
    B.
    Plan Position Indicator
    C.
    Phase Position Indicator
    D.
    Point Position Indicator

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  5. In phase shift keying the input signal is

    6. A.
    st(t) = A cos ω0t and s2(t) = - A cos ω0t
    B.
    s1(t) = s2(t) = A cos ω0t
    C.
    s1(t) = A cos ω0t and s2(t) = A cos (ω0t + p/2)
    D.
    s1(t) = A cos ω0t and s2(t) = - A (cos ω0t + p/2)

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  6. In figure the output v(t) is

    7. A.
    an amplitude modulated signal
    B.
    a frequency modulated signal
    C.
    a phase modulated signal
    D.
    none of the above

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  7. If Pk be the probability of the message to be received or transmitted, then the amount of information (Ik) associated, in bits, will be

    8. A.
    Ik = log2 Pk
    B.
    C.
    D.

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  8. A circuit which cannot demodulate SSB is

    9. A.
    balanced modulator
    B.
    product detector
    C.
    BFO
    D.
    phase discriminator

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  9. In TV system in India IF video and IF audio frequencies are

    10. A.
    33.4 and 28.4 MHz respectively
    B.
    38.9 and 33.4 MHz respectively
    C.
    43.8 and 38.9 MHz respectively
    D.
    33.4 and 38.9 MHz respectively

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  10. Assertion (A): The unit of telephone traffic measurement is erlang.

    Reason (R): International circuits for communication are fitted with echo suppressors.

    11. 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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