Modulation and Demodulation-1 Starter Quiz

Consider an AM signal given by. The total power in watts is ______

A 20 kW carrier is sinusoidally modulated by two carriers corresponding to a modulation index of 20% and 50% respectively. Total radiated power in (kW) is_____

A sinusoidal message signal is applied to x – plates of CRO and corresponding AM signal is applied at y – plates then the pattern observed on CRO is given by

Then modulation index will be _____________

A message signal to periodic with period T & modulation index 0.4 as shown in figure. This message signals is applied to an AM modulator with modulation efficiency would be

Consider the AM modulated signal: s(t) = 10 [1 + 0.50 cos (2000ϖt)] cos (20000ϖt). If this AM signal is demodulated by an envelope detector, then the maximum value of time constant (RC) of the envelop detector, which allows to detector to follow the message signal envelop will be