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ECE :: Communication Systems

  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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  3. Sound waves are electromagnetic waves.

  4. A.
    True
    B.
    False

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

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

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

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

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  9. The filter circuit for feeding a wooffer has

  10. 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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  11. The Hilbert transform of cos ω1t + sin ω2t is

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

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

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

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

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

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

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  19. The function of blend control in stereo system is

  20. 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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