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1)

A telephonic communication service is working at carrier freequency of 10 GHz. Only 10% of it is utilised for transmission. How many telephonic channels can be transmitted simultaneously, if each channel requires a bandwidth of 5kHz?


A) 2×104

B) 2×103

C) 2×105

D) 2×106

Answer:

Option C

Explanation:

Only 10% of 10 GHz is utillised for transmission.

        Band available for transmission

                        = 10100×10×109Hz=109Hz

   Now, If there are channels each using 5 kHz then,  n×5×103=109

                                   n=2×105