JEE Main 2022 (Online) 25th July Evening Shift | Communication Systems Question 33 | Physics

In AM modulation, a signal is modulated on a carrier wave such that maximum and minimum amplitudes are found to be 6 V and 2 V respectively. The modulation index is :

100%

80%

60%

50%

JEE Main 2022 (Online) 30th June Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

A speech signal given by 11 sin(2200 $$\pi$$t) V is used for amplitude modulation with a carrier signal given by 44 sin(6600 $$\pi$$t) V. The minimum amplitude of modulated wave will be :

33 V

55 V

8.25 V

13.75 V

JEE Main 2022 (Online) 29th June Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The TV transmission tower at a particular station has a height of 125 m. For doubling the coverage of its range, the height of the tower should be increased by

125 m

250 m

375 m

500 m

JEE Main 2022 (Online) 29th June Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Only 2% of the optical source frequency is the available channel bandwidth for an optical communicating system operating at 1000 nm. If an audio signal requires a bandwidth of 8 kHz, how many channels can be accommodated for transmission :

375 $$\times$$ 10⁷

75 $$\times$$ 10⁷

375 $$\times$$ 10⁸

75 $$\times$$ 10⁹

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