Q1. A device with input x(t) and output y(t) is characterized by y(t) = x(t). If a FM signal with frequency deviation 90 Khz and modulating frequency 5 Khz is applied to the input terminals of the device then what will be the bandwidth of the output signal received ? What i did was calculated the modulating index i.e by dividing frequency deviation by the modulating frequency and got the value equal to 18. Then by using carson rule calculated the bandwidth of the FM signal to be B.W = 2(18 + 1)(5) = 190 Khz. But answer is not this , how should i do the question then ?