GATE ECE 2018 | Question: 15

Question

Consider the following amplitude modulated signal:
$$s\left ( t \right )=\cos\left ( 2000\:\pi t \right )+4\cos\left ( 2400\:\pi t \right )+ \cos\left ( 2800\:\pi t \right ).$$The ratio (accurate to three decimal places) of the power of the message signal to the power of the carrier signal is _________.

Answer 1

Answer should be 0.25

Comments

Yup..ans should be .25...it has to be challenged..

Answer 2

CAN ANYONE PLEASE ANSWER HOW ANSWER IS BETWEEN .12-.13 BECOZ ANSWER SHOULD BE .25 AND THEY HAVE NOT ACCEPTED THE CHALLENGE ON THE ANSWER KEY THAT IS BEING DONE.