Menu
Home / ECE / Communication Systems :: Section 17

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. In VCR the luminance signal is recorded by

    2. A.
    frequency modulation
    B.
    phase modulation
    C.
    amplitude modulation
    D.
    direct recording

    View Answer

    Workspace

    Discuss Discuss in Forum

  2. Assertion (A): In digital communication data is coded prior to being transferred.

    Reason (R): A number of codes for digital data processing are available.

    3. 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

    View Answer

    Workspace

    Discuss Discuss in Forum

  3. In FM modulation pre-emphasis is done for

    4. A.
    high frequency components
    B.
    low frequency components
    C.
    middle frequency components
    D.
    both (a) and (b)

    View Answer

    Workspace

    Discuss Discuss in Forum

  4. c(t) and m(t) are used to generate an AM signal. The modulation index of the generated AM signal is 0.5 then the quantity
    is

    5. A.
    1/2
    B.
    1/4
    C.
    1/3
    D.
    1/8

    View Answer

    Workspace

    Discuss Discuss in Forum

  5. High intermediate frequency in a superheterodyne receiver

    6. A.
    higher than
    B.
    lower than
    C.
    equal to
    D.
    not comparable to

    View Answer

    Workspace

    Discuss Discuss in Forum

  6. The number of repeaters in a coaxial cable link depends on

    7. A.
    system bandwidth
    B.
    separation of equalizers
    C.
    the number of coaxial cables in the tube
    D.
    none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  7. The overall noise temperature Te, absolute temperature T and noise figure F are related as

    8. A.
    Te = T(F - 1)
    B.
    Te = F(T - 1)
    C.
    T = Te(F - 1)
    D.
    Te = (T)(F)

    View Answer

    Workspace

    Discuss Discuss in Forum

  8. In binary data transmission DPSK is preferred to PSK because

    9. A.
    a coherent carrier is not required to the generated at the receiver
    B.
    for a given energy per bit, the probability for zero is less
    C.
    the 180° phase shifts of the carrier
    D.
    more protection is provided against impulse noise

    View Answer

    Workspace

    Discuss Discuss in Forum

  9. A basic group B

    10. A.
    consists of five super groups
    B.
    has a frequency range of 60 to 108 kHz
    C.
    consists of erect channels only
    D.
    is formed at group translating equipment

    View Answer

    Workspace

    Discuss Discuss in Forum

  10. By the use of which of the following the PPM can be converted to PWM?

    11. A.
    A stable multivibrator
    B.
    Integrator
    C.
    Monostable multivibrator
    D.
    Bistable Multivibrator

    View Answer

    Workspace

    Discuss Discuss in Forum

Java Programming Questions and Answers Interview Questions and Answers