Communication Systems
A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

1
8
16
15

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Communication Systems
In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

Amplitude of distant sidebands first increases, then decreases
Amplitude of distant sidebands increases
Amplitude of distant sidebands decreases
Amplitude of distant sidebands remains constant

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