TS EAMCET 2022 (Online) 20th July Evening Shift | Communication Systems Question 18 | Physics

For an amplitude modulated wave, the modulation index is found to be 0.5 . If the maximum amplitude is found to be 10.0 V , then the minimum amplitude is

5.0 V

3.33 V

2.5 V

6.66 V

TS EAMCET 2022 (Online) 20th July Morning Shift

MCQ (Single Correct Answer)

-0

A carrier wave of peak voltage 10 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of $80 \%$ ?

8 V

8.8 V

5 V

12.5 V

TS EAMCET 2022 (Online) 19th July Evening Shift

MCQ (Single Correct Answer)

-0

Which of the following statements is not true?

Power radiated from a linear antenna is directly proportional to square of antenna length.

Power radiated decreases with increasing frequency.

Antenna should have a size comparable to the wavelength of the signal.

Effective power radiated by a long wavelength base band signal is small.

TS EAMCET 2022 (Online) 19th July Morning Shift

MCQ (Single Correct Answer)

-0

The range of frequency bands used for standard AM broadcast is

$540-1600 \mathrm{kHz}$

$88-108 \mathrm{MHz}$

$800-900 \mathrm{MHz}$

$3.7-4.2 \mathrm{GHz}$

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