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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. If D is diagonal and F is focal length, lens angle θ is

    2. A.
    θ = tan-1 (D/F)
    B.
    θ = 2 tan-1 (D/F)
    C.
    θ = tan-1 (D/2F)
    D.
    θ = 2 tan-1 (D/2F)

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  2. Present day stereophonic systems have

    3. A.
    only CD playback facility
    B.
    only tape playback facility
    C.
    both CD and tape playback facilities along with radio
    D.
    none of the above

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  3. RF choke used for suppressing interference in TV is generally

    4. A.
    honey comb wound coil
    B.
    iron core coil
    C.
    single layer coil
    D.
    multilayer coil

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  4. Indicate the false statement: To combat noise

    5. A.
    reduce signalling rate
    B.
    increase transmitted power
    C.
    use redundancy
    D.
    increase channel bandwidth

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  5. Audio and video signals are called modulating waves.

    6. A.
    True
    B.
    False

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  6. In AM, if modulation index is more than 100%, then

    7. A.
    bandwidth increases
    B.
    the wave gets distorted
    C.
    power of the wave increases
    D.
    efficiency of transmission increases

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  7. The width of air gap on recording head in a tape recorder is about

    8. A.
    6 micron
    B.
    3 micron
    C.
    1 micron
    D.
    25 micron

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  8. In a stereo tape recorder the speed of the tape is

    9. A.
    38 m/s
    B.
    19 m/s
    C.
    9.5 m/s
    D.
    4.75 m/s

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  9. Which of the following refers to SSB suppressed carrier amplitude modulated system?

    10. A.
    A3E
    B.
    H3E
    C.
    J3E
    D.
    C3F

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  10. The frequency at which the piezoelectric effect occurs is primarily determined by

    11. A.
    the weight of the crystal
    B.
    thickness of the crystal
    C.
    length of the crystal
    D.
    gain structure of the crystal

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