Q16 of 30 Page 102

Would sky waves be suitable for transmission of TV signals of 60 MHz frequency?

Sky waves can’t carry frequencies above 40MHz. Hence, the sky waves are not suitable for transmitting signals of 60MHz.


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14

In amplitude modulation, the modulation index m, is kept less than or equal to 1 because

 15

Which of the following would produce analog signals and which would produce digital signals?

(i) A vibrating tuning fork.


(ii) Musical sound due to a vibrating sitar string.


(iii) Light pulse.


(iv) Output of NAND gate.


 17

Two waves A and B of frequencies 2 MHz and 3 MHz, respectively are beamed in the same direction for communication via sky wave. Which one of these is likely to travel longer distance in the ionosphere before suffering total internal reflection?

 18

The maximum amplitude of an A.M. wave is found to be 15 V while its minimum amplitude is found to be 3 V. What is the modulation index?