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Communication S...

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  • Question 1
    4 / -1

    What fraction of the surface area of the earth can be covered to establish communication by one geostationary satellite?

  • Question 2
    4 / -1

    If sky wave with a frequency of 50 MHz is incident on D region at an angle of 30°, then angle of refraction is

  • Question 3
    4 / -1

    The characteristic impedance of a coaxial cable is of the order of

  • Question 4
    4 / -1

    Which one of the following is a full duplex transmission system?

  • Question 5
    4 / -1

    The characteristic impedance (Z0 ) of free space is

  • Question 6
    4 / -1

    What is the minimum length of antenna required to transmit a radio signal of frequency 20 MHz ?

  • Question 7
    4 / -1

    What happens inside optical fibre?

  • Question 8
    4 / -1

    An antenna is of height 500 m. What will be its range (Radius of the earth is 6400 km)?

  • Question 9
    4 / -1

    Antenna is

  • Question 10
    4 / -1

    How many photons are emitted by a laser source of 5 × 10-3 W operating at 632.2 nm in 2s ?

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