Amplitude modulation questions pdf

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Concept : The transmission efficiency of an AM wave is defined as the percentage of total power contributed by the sidebands. Answer Detailed Solution Below Option 4 : Answer Detailed Solution Below 0. Answer Detailed Solution Below Option 1 : 7. DSB -SC : 1 It is a form of Amplitude modulation where only the sidebands are transmitted and the carrier is suppressed. Explanation: Electromagnetic spectrum: It is a collection of a range of different waves in sequential order from radio to gamma electromagnetic waves.

Radio waves: The lowest frequency portion comes in radio waves generally, have wavelengths range between 1 mm to km or frequencies between GHz to 3 kHz.

There are some subcategories in between these waves like AM and FM radio. Frequency Phase Amplitude None of the above. Amplitude Modulation AM is preferred for picture transmission on TV because of the following reasons: The distortion which arises due to interference between multiple signals is more in FM than AM because the frequency of the FM signal continuously changes. On the other hand, FM is preferred for sound because of the following reasons: The bandwidth assigned to the FM sound signal is about kHz, of which not more than kHz is occupied by significant sidebands.

Answer Detailed Solution Below Option 2 : 0. Exam Preparation Simplified Learn, practice, analyse and improve. Testbook Edu Solutions Pvt. Our Apps. Total power P T. Medium-wave Short wave. One sideband completely. It can be observed that the positive and negative peaks of the carrier wave, are interconnected with an imaginary line. This line helps recreating the exact shape of the modulating signal.

This imaginary line on the carrier wave is called as Envelope. It is the same as the message signal. A carrier wave, after being modulated, if the modulated level is calculated, then such an attempt is called as Modulation Index or Modulation Depth.

It states the level of modulation that a carrier wave undergoes. The maximum and minimum values of the envelope of the modulated wave are represented by A max and A min respectively. Hence, the equation for Modulation Index is obtained. This is often denoted in percentage called as Percentage Modulation. It is the extent of modulation denoted in percentage, and is denoted by m.

For instance, if this value is less than 1, i.