A form of modulation In which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal, is known as

In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.

A

Amplitude

B

Frequency

C

Phase

D

None of the above

Overmodulation (amplitude) occurs when signal amplitude is ___________ carrier amplitude

A

Equal to

B

Greater than

C

Less than

D

None of the above

In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

A

Amplitude of distant sidebands decreases

B

Amplitude of distant sidebands increases

C

Amplitude of distant sidebands remains constant

D

Amplitude of distant sidebands first increases, then decreases

When the modulating signal controls the frequency of the carrier, we get___________

A

Phase modulation

B

Amplitude modulation

C

Frequency modulation

D

May be any one of the above

দেওয়া আছে (i) অর্ধপরিবাহীর Majority carrier election, (ii) p-type অর্ধপরিাবাহীর Majority carrier hole এবং (iii) pure অর্ধপিরবাহীর Majority carrier hole । নিচের কোনটি সঠিক?

A

i ও ii

B

ii ও iii

C

i ও iii

D

i, ii, ও iii

For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

A

1

B

0.8

C

0.5

D

0

In amplitude modulation, bandwidth is ___________ the audio signal frequency

A

Thrice

B

Four times

C

Twice

D

None of the above

When a wave strikes a vertical breakwater in deep water, it is reflected back and on meeting another advancing wave of similar amplitude merges and rises vertically in a wall of water. This phenomenon is called

A

Surf

B

Clapotis

C

Fetch

D

Swell

Modulation in which the two binary values are represented by two different amplitudes of the carrier frequency is known as

A

Amplitude-shift keying

B

Amplitude

C

Amplitude modulation

D

Aloha

E

None of the above

What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?

A

1

B

>1

C

None of these

A form of modulation In which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal, is known as

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