TS EAMCET 2020 (Online) 11th September Morning Shift | Communication Systems Question 27 | Physics

A message signal is super-imposed with a carrier signal. The resulting modulating signal $C_m(t)$ is given by $C_m(t)=A_1 \sin \left(\omega_1 t\right)+A_2 \sin \left(\omega_2 t\right)-A_2 \sin \left(\omega_3 t\right)$, where $\omega_2<\omega_1<\omega_3$. The modulation index and the angular frequency fo the message signal respectively, are

$\frac{A_2}{A_1}, \frac{\omega_3-\omega_2}{2}$

$\frac{2 A_2}{A_1}, \omega_3-\omega_2$

$\frac{A_1}{2 A_2}, \frac{\omega_3-\omega_2}{2}$

$\frac{2 A_2}{A_1}, \frac{\omega_3-\omega_2}{2}$

TS EAMCET 2020 (Online) 10th September Evening Shift

MCQ (Single Correct Answer)

-0

Assertion (A) Television signals are received through sky-wave propagation.

Reason (R) The ionosphere reflects electromagnetic waves of frequencies in the range ( $3-30) \mathrm{MHz}$.

Choose the correct option.

A is true, R is true and R is the correct explanation for A .

$A$ is true, $R$ is true but $R$ is not the correct explanation for $A$.

$A$ is true but $R$ is false.

$A$ is false but $R$ is true.

TS EAMCET 2020 (Online) 10th September Morning Shift

MCQ (Single Correct Answer)

-0

A message signal of frequency 10 kHz and peak voltage of 15 V is used to modulate a carrier frequency of 1 MHz and peak voltage of 30 V . Determine the modulation index.

0.5

0.6

0.7

0.8

TS EAMCET Subjects

Browse all chapters by subject