TS EAMCET 2022 (Online) 20th July Morning Shift | Communication Systems Question 19 | Physics

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

$540-1600 \mathrm{kHz}$

$88-108 \mathrm{MHz}$

$800-900 \mathrm{MHz}$

$3.7-4.2 \mathrm{GHz}$

TS EAMCET 2022 (Online) 18th July Evening Shift

MCQ (Single Correct Answer)

-0

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

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