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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. MTI stands for

    2. A.
    Moving Target Indicator
    B.
    Microprocessor Tracking Index
    C.
    Multiplexed Telemetry Index
    D.
    Maximum Transmission Index

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  2. The IF frequencies in a TV receiver

    3. A.
    38.9 MHz for video and 33.4 MHz for audio
    B.
    38.9 MHz for both video and audio
    C.
    33.4 MHz for both video and audio
    D.
    33.4 MHz for video and 38.9 MHz for audio

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  3. The most noise resistant modulation system is

    4. A.
    PCM
    B.
    SSB suppressed carrier
    C.
    FM
    D.
    pulse position modulation

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  4. Which of the following is the digital system?

    5. A.
    PWM
    B.
    PAM
    C.
    PPM
    D.
    PCM

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  5. Which of the following is an oscillator with best frequency stability?

    6. A.
    Crystal oscillator
    B.
    Clapp oscillator
    C.
    Phase shift circuit
    D.
    Multivibrator

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  6. In FDM systems used for telephone, which modulation scheme is adopted?

    7. A.
    AM
    B.
    DSB-SC
    C.
    SSB-SC
    D.
    FM

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  7. In the above case if another sine wave corresponding to 40% modulation is transmitted simultaneously, the total radiated power will be

    8. A.
    9.9 kW
    B.
    10.15 kW
    C.
    10.84 kW
    D.
    18.4 kW

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  8. A pre-emphasis circuit

    9. A.
    boosts base frequencies
    B.
    pre amplifies the complete audio band
    C.
    amplifies higher audio frequencies
    D.
    converts FM into phase modulation

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  9. In orthogonal BFSK, the energy of information bearing term is

    10. A.
    the same as total transmitted energy
    B.
    one-half of total transmitted energy
    C.
    one-fourth of total transmitted energy
    D.
    none of the above

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  10. In a tape recorder

    11. A.
    both record and erase heads have high permeability core
    B.
    the record head has high permeability core but the erase head has low permeability core
    C.
    the record head has low permeability core but the erase head has high permeability core
    D.
    both record and erase heads have low permeability core

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