TS EAMCET 2022 (Online) 18th July Evening Shift | Communication Systems Question 22 | Physics

A message signal of frequency 15 kHz is used to modulate a carrier of frequency $v_c$. If the side bands produced are 1515 kHz and 1485 kHz , then $v_c$ is

2.0 MHz

1.5 MHz

2.5 MHz

3.0 MHz

TS EAMCET 2022 (Online) 18th July Morning Shift

MCQ (Single Correct Answer)

-0

A TV transmission antenna is 40 m tall. How much service area is can cover, if the receiving antenna is at the ground level?

(radius of the earth $=6400 \mathrm{~km}$ )

$640 \pi \times 10^6 \mathrm{~m}^2$

$512 \pi \times 10^6 \mathrm{~m}^2$

$480 \pi \times 10^6 \mathrm{~m}^2$

$440 \pi \times 10^6 \mathrm{~m}^2$

TS EAMCET 2020 (Online) 14th September Evening Shift

MCQ (Single Correct Answer)

-0

A message signal of frequency $50 / \pi \mathrm{kHz}$ and peak voltage of 5 V is used to modulate a carrier of frequency 1 MHz and peak voltage 20 V . The modulation index is

$\frac{\pi}{10}$

0.4

0.5

0.25

TS EAMCET 2020 (Online) 14th September Morning Shift

MCQ (Single Correct Answer)

-0

The function of a detector is to demodulate the modulated carrier wave and the steps for this process are

demodulation and filtering

demodulation and rectification

rectification and filtering

regeneration and filtering

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