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Statement-I : A communication satellite ...

Statement-I : A communication satellite is essentially a repeater in space.
Statement-II : It reflects the signals from transmitter to receiver.

A

Statetment-I is True, Statement-II is True , Statement-II is a correct explanation for Statement-I

B

Statement-I is True, Statement-II is True , Statement-II is NOT a correct explanation for Statement-I

C

Statement-I is True, Statement-II is False

D

Statement-I is False, Statement-II is True

Text Solution

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The correct Answer is:
A
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Statement 1: Sky wave communication is not used to transmit TV signals Statement 2: The ionosphere does not reflect TV signals, it transmits tham.

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A satellite is revolving in an elliptical orbit in free space, then the false statement is

Perhaps, the most commonly used mode of communication involves use of free space as a communication channel between transmitter and receiver. The various possible modes of using of free space have been described below Ground wave communication : This mode is used for low frequency as at high frequency, losses become large. This is useful for distance of the order of 1 km. Space wave communication: The signals are transmitted directly from transmitter to receiver. There is no limit to upper frequency, but its range is limited to few hundred kilometers. The range depends on the height of transmitting antenna Sky wave communication : The signals are sent towards sky They are reflected back towards earth by ionosphere. Its range can be above 500 km. But, very high frequencies (above 10 MHz) are not reflected back. Satellite communication: The signals that cannot be reflected back by ionosphere are reflected back by satellite. Moon is a passive satellite of earth. The cordless phone installed in a house uses

Perhaps, the most commonly used mode of communication involves use of free space as a communication channel between transmitter and receiver. The various possible modes of using of free space have been described below Ground wave communication : This mode is used for low frequency as at high frequency, losses become large. This is useful for distance of the order of 1 km. Space wave communication: The signals are transmitted directly from transmitter to receiver. There is no limit to upper frequency, but its range is limited to few hundred kilometers. The range depends on the height of transmitting antenna Sky wave communication : The signals are sent towards sky They are reflected back towards earth by ionosphere. Its range can be above 500 km. But, very high frequencies (above 10 MHz) are not reflected back. Satellite communication: The signals that cannot be reflected back by ionosphere are reflected back by satellite. Moon is a passive satellite of earth. The frequency range allotted to FM radio broadcast is 88 MHz to 108 MHz. Which of the following communication channels can be used for its transmission?

ALLEN-SEMICONDUCTORS-Part-3(Exercise-3)
  1. Assertion: The television broadcasting becomes weaker with increasing ...

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  2. Assertion: The Microwave propagation is better than the sky wave propa...

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  3. Statement-I : Semiconductors do not obey Ohm's law Statement-II : El...

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  4. Statement-I : Germanium is preferred over silicon for making semicondu...

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  5. Assertion : p-n junction diode can be used even at ultra high frequenc...

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  6. Statement-I : A p-n junction with reverse bias can be used as a photod...

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  7. Assertion: NAND or NOR gates are called digital building blocks. Rea...

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  8. Assertion: Two P-N junction diodes placed back to back, will work as a...

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  9. Statement-I : When base region has larger width, the collector current...

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  10. Statement-I : For faster action, n-p-n transistor is used Statement-...

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  11. Statement-I : To be used as amplifier, the transistor in the common em...

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  12. Statement-I : Many channels get allowed when transmission frequency is...

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  13. Statement-I : Optical fibres are free from electromagnetic disturbance...

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  14. Statement-I : Diode lasers are used as optical sources in optical comm...

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  15. Statement-I : Electromagnetic waves with frequencies smaller than the ...

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  16. Assertion : In optical fibre, the diameter of the core is kept small. ...

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  17. Statement-I : For the same antenna length, power radiated by short wav...

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  18. Statemet-1: the electrical conductivity of earth's atmosphere increase...

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  19. Assertion:- Optical communication system is more economical than other...

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  20. Statement-I : A communication satellite is essentially a repeater in s...

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