JEE Main 2023 (Online) 6th April Morning Shift | Communication Systems Question 12 | Physics

In an amplitude modulation, a modulating signal having amplitude of X Volt is superimposed with a carrier signal of amplitude Y Volt in first case. Then, in second case, the same modulating signal is superimposed with different carrier signal of amplitude 2Y Volt. The ratio of modulation index in the two cases respectively will be :

2 : 1

1 : 1

4 : 1

1 : 2

JEE Main 2023 (Online) 1st February Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which of the following frequencies does not belong to FM broadcast ?

$$106 ~\mathrm{MHz}$$

$$89 ~\mathrm{MHz}$$

$$64 ~\mathrm{MHz}$$

$$99 ~\mathrm{MHz}$$

JEE Main 2023 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Given below are two statements :

Statement I : For transmitting a signal, size of antenna ( $l$ ) should be comparable to wavelength of signal (at least $l=\frac{\lambda}{4}$ in dimension)

Statement II: In amplitude modulation, amplitude of carrier wave remains constant (unchanged).

In the light of the above statements, choose the most appropriate answer from the options given below

Statement I is incorrect but Statement II is correct

Both Statement I and Statement II are correct

Both Statement I and Statement II are incorrect

Statement I is correct but Statement II is incorrect

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Questions Asked from Communication Systems (MCQ (Single Correct Answer))

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