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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. Frequency shifting keying is basically a method involving

    2. A.
    amplitude modulation
    B.
    frequency modulation
    C.
    phase modulation
    D.
    none of the above

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  2. Which of the following codes provides parity checks?

    3. A.
    CCITT-2
    B.
    EBCDIC
    C.
    ASCII
    D.
    Baudot

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  3. PA radar means

    4. A.
    Phased Array radar
    B.
    Pulsed Array radar
    C.
    Pulse Amplitude radar
    D.
    None of the above

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  4. Dynamic range of hi-fi system is at least

    5. A.
    150 dB
    B.
    120 dB
    C.
    80 dB
    D.
    40 dB

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  5. A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through

    6. A.
    an RC filter
    B.
    an envelope detector
    C.
    a PPL
    D.
    an ideal low pass filter with the appropriate bandwidth

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  6. The seven segment display used in watches and clocks generally uses

    7. A.
    LED
    B.
    LCD
    C.
    Photodiode
    D.
    FET

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  7. If e = 10 sin(108 t + 3 sin 104 t) then modulating frequency is

    8. A.
    159 Hz
    B.
    1590 Hz
    C.
    1.59 MHz
    D.
    15.9 MHz

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  8. When a signal is quantized such that the step size S is small in comparison with the peak to peak range of the signal, the mean square quantization error is equal to

    9. A.
    S2
    B.
    C.
    D.

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  9. Assertion (A): Many times a radar cannot detect 'grounding hopping' military aircraft.

    Reason (R): Ground interference limits the range of radar.

    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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  10. Entropies associated with an extremely unlikely message and that with an extremely likely message are respectively

    11. A.
    0 and 0
    B.
    1 and 1
    C.
    1 and 0
    D.
    0 and 1

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