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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. Oscillator crystal is made of

    2. A.
    silicon
    B.
    germanium
    C.
    diamond
    D.
    quartz

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  2. If an isotropic source is radiating power P in all directions, the electric field at a distance d from the source is proportional to

    3. A.
    (P/d)0.5
    B.
    C.
    D.

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  3. An FM signal has modulating frequency fm and maximum frequency deviation of δ. The bandwidth will be nearly equal to

    4. A.
    δ
    B.
    2 δ
    C.
    2fm δ
    D.
    fm δ

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  4. In a cellular communication system, path loss between transmitter and receiver is due to

    5. A.
    scattering from building, trees, vehicles and other structure
    B.
    reason at (a) above and due to reflections from ground only
    C.
    reason at (a) and (b) above along with reflections from ionosphere only
    D.
    reasons at (a), (b) and (c) above along with loss due to surface wave phenomenon

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  5. Transistor T1 operates at 30 kHz and T2 operates at 300 Hz. The flicker noise is

    6. A.
    not depend on frequency
    B.
    T1 > T2
    C.
    T1 = T2
    D.
    T1 < T2

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  6. A pre-emphasis circuit provides extra noise immunity by

    7. A.
    converting the phase modulation to frequency modulation
    B.
    pre-amplifying the whole audio band
    C.
    boosting the base frequencies
    D.
    amplifying the higher audio frequencies

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  7. A tape recorder and deck are entirely similar.

    8. A.
    True
    B.
    False

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  8. The antenna current of an AM transmitter is 8 A. When only the carrier is sent, but it increases to 8.93 A. When the carrier is sinusoidally modulated. The percentage modulation is nearly

    9. A.
    90%
    B.
    80%
    C.
    75%
    D.
    70%

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  9. Assertion (A): SSB systems generally have duplex operation

    Reason (R): SSB systems are generally used in two way communication.

    10. 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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