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Explain why remote radio stations can be...

Explain why remote radio stations can be picked up late in the night over great distances? 

Text Solution

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Because they can bounce off ionosphere layer in the upper atmosphere
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Knowledge Check

  • Figure : Long distance power transmissions The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up. It is then transmitted over long distances to an area sub station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes. If the secondary coil has a greater number of turns than the primary,

    A
    The voltage is stepped-up `(V_(s) gtV_(p))` and arrangement is called a step-up transformer
    B
    the voltage is stepped-down `(V_(s) lt V_(p))` and arrangement is called a step down transformer
    C
    the voltage is stepped-down `(I_(s) gt I_(p))` and arrangement is called a step down transformer
    D
    the voltage is stepped-down `(I_(s) lt I_(p))` and arrangement is called a step down transformer

  • Figure : Long distance power transmissions The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up. It is then transmitted over long distances to an area sub station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes. We need to step-up the voltage for power. transmission, so that:

    A
    The currentis reduced and consequently, the `I^(2)R` loss is cut down
    B
    The voltage is increased, the power losses are also increased
    C
    The power is increased before transmission is done
    D
    The voltage is decreased so `(V^(2))/(R)` losses.are reduced

  • Figure : Long distance power transmissions The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up. It is then transmitted over long distances to an area sub station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes. Which of the following statement is true?

    A
    Energy is created when a transformer steps up the voltage
    B
    A transformer is designed to convert an AC voltage to DC voltage
    C
    Step-up transformer increases the power for transmission
    D
    tep-down transformer decreases the AC voltage

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