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Name the device fitted in the satellite ...

Name the device fitted in the satellite which receives signals from Earth station and transmits them in different directions after amplification.

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Knowledge Check

  • At certain distance from a transmitting tower a receiver tower of height 180m is used to receive direct signal. Another tower is installed beyond the first along the same line of sight to receive the signals from the same transmitter. Its height is 21% more than the first receiving tower. Then the separation between the two receiving towers is

    A
    `6.4 km`
    B
    `3.2 km`
    C
    `1.6 km`
    D
    `4.8 km`

  • A certain distance from a transmitting tower a receiver tower of height 20 m is used to receive direct signal. Another tower is installed beyond the first along the same line of sight to receive the signals from the same transmitter. Its height is 44% more than the first receiving tower. Then the separation between the two receiving towers is

    A
    `6.4 km`
    B
    `3.2 km`
    C
    `1.6 km`
    D
    `0.8 km`

  • Select the option which appropriately fills up the blanks. The afferent neuron receives signal from a/an ________ and transmits the impulse via a __________ into the spinal cord.

    A
    Effector, motor end plate
    B
    Motor endplate, effector
    C
    Dorsal root ganglion, sensory organ
    D
    Sensory organ, dorsal root ganglion

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    Name the device which is used to protect a tall building from lightning.

    Name the star (after the sun) which is closest to the Earth.

    Height h(400=m) from the ground at place A, from which the readiowaves can be transmitted. There is a receive at station B on earth at a distance d(=125km), which can receive the signal from station A. The radiowaves can reach the station B, either through earth's atmosphere or through satellite. There are four main layers in earth's atmosphere named D,E, F_(1) and F_(2) which play effective role in radio communication. The electron density of these layers is 4xx10^(8), 2xx10^(11),5xx10^(11) and 8xx10^(11)m^(-3) . The radius of the earth is 6.4xx10^(6)m . If the station A sends the T.V. signals, then the maximum area on earth upto which T.V. transmission can be received on earth is (average population density around the tower is 1000 km^(-2) )

    Height h(400=m) from the ground at place A, from which the readiowaves can be transmitted. There is a receive at station B on earth at a distance d(=125km), which can receive the signal from station A. The radiowaves can reach the station B, either through earth's atmosphere or through satellite. There are four main layers in earth's atmosphere named D,E, F_(1) and F_(2) which play effective role in radio communication. The electron density of these layers is 4xx10^(8), 2xx10^(11),5xx10^(11) and 8xx10^(11)m^(-3) . The radius of the earth is 6.4xx10^(6)m . If the frequency of the transmitting station is 5 MHz. and maximum number density of electrons in the ionosphere is 10^(-12)m^(-3) , state whether it is coming via

    Height h(400=m) from the ground at place A, from which the readiowaves can be transmitted. There is a receive at station B on earth at a distance d(=125km), which can receive the signal from station A. The radiowaves can reach the station B, either through earth's atmosphere or through satellite. There are four main layers in earth's atmosphere named D,E, F_(1) and F_(2) which play effective role in radio communication. The electron density of these layers is 4xx10^(8), 2xx10^(11),5xx10^(11) and 8xx10^(11)m^(-3) . The radius of the earth is 6.4xx10^(6)m . The ratio of critical frequency for reflection of radiowaves from E, F_(1) and F_(2) layers in ionosphere of earth's atmosphere is

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