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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. As the frequency increases, the absorption of ground wave by earth's surface

    2. A.
    decreases
    B.
    increases
    C.
    remains the same
    D.
    either (a) or (c)

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  2. The velocity of sound waves in air

    3. A.
    is constant at all temperatures
    B.
    varies directly as temperature
    C.
    varies inversely as absolute temperature
    D.
    varies directly as square root of absolute temperature

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  3. The range of a cordless telephone is about

    4. A.
    1000 m
    B.
    500 m
    C.
    100 m
    D.
    10 m

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  4. An earth mat for a communication tower consists of

    5. A.
    one or two radials extending from base of tower at a depth of about 5 cm below ground
    B.
    a large number of radials extending from base of tower at a depth of about 3 m
    C.
    a large number of radials extending from base of tower at a depth of about 30 cm
    D.
    none of the above

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  5. Degaussing in a picture tube means

    6. A.
    Adding magnetism in mask and mounting frame
    B.
    Removing residual magnetism in mask, shield etc...
    C.
    Increasing resistance of coils to decrease time constant
    D.
    Decreasing resistance of coils to increase time constant.

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  6. The rate at which information can be carried through a communication channel depends on

    7. A.
    carrier frequency
    B.
    bandwidth
    C.
    transmission loss
    D.
    transmitted power

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  7. Some types of traps used in video IF amplifier of colour TV are

    8. A.
    shunt traps
    B.
    series traps
    C.
    absorption traps
    D.
    all of the above

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  8. Direct and reflected sound waves may interfere with each other.

    9. A.
    True
    B.
    False

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  9. A carrier is simultaneously modulated by two sine waves having modulation indices of 0.4 and 0.3. The total modulation index will be

    10. A.
    0.1
    B.
    0.7
    C.
    0.5
    D.
    0.35

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  10. A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. Which of the following frequency is least likely to be present in the output?

    11. A.
    1002 kHz
    B.
    1000 kHz
    C.
    999.2 kHz
    D.
    998.0 kHz

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