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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. The F.T. of {e-1 ∪(t)} is equal to . Therefore
    is

    2. A.
    ef ∪ (f)
    B.
    e-f ∪ (f)
    C.
    ef ∪ (-f)
    D.
    e-f ∪ (-f)

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  2. Sound waves are electromagnetic waves.

    3. A.
    True
    B.
    False

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  3. In major diatonic musical scale, an octave is divided into

    4. A.
    12 intervals
    B.
    10 intervals
    C.
    7 intervals
    D.
    5 intervals

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  4. The bandwidth of DSB suppressed carrier modulation system when the modulating frequency varies between 500 Hz and 5 kHz is

    5. A.
    555 kHz
    B.
    505 kHz
    C.
    500 kHz
    D.
    9 kHz

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  5. The filter circuit for feeding a wooffer has

    6. A.
    an inductance in series and capacitance in parallel
    B.
    a capacitance in series and an inductance in parallel
    C.
    a resistance in series and an inductance in parallel
    D.
    an inductance in series and a resistance in parallel

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  6. The Hilbert transform of cos ω1t + sin ω2t is

    7. A.
    sin ω1t + cos ω2t
    B.
    sin ω1t - cos ω2t
    C.
    cos ω1t - cos ω2t
    D.
    - sin ω1t + cos ω2t

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  7. In ionosphere incidence angle is 60°. The maximum usable frequency fm is equal to

    8. A.
    2fc
    B.
    fc
    C.
    0.5 fc
    D.
    3 fc

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  8. The generally used value of EHV supply in TV receivers is

    9. A.
    1 kV per diagonal cm
    B.
    1 kV per diagonal inch
    C.
    0.5 kV per diagonal cm
    D.
    0, 5 kV per diagonal inch

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  9. The number of channels available in MF band (300 kHz - 3 MHz) for AM modulating signal of 20 kHz is

    10. A.
    70
    B.
    67
    C.
    100
    D.
    150

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  10. The function of blend control in stereo system is

    11. A.
    to dilute left channel
    B.
    to dilute right channel
    C.
    to dilute any of the channels
    D.
    none of the above

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