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Which of the following four alternatives is correct? We need modulation:

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To reduce the fractional band width, that is the ratio of the signal band width to the center frequency

To reduce the size of antenna

To increase the selectivity

To reduce the time lag between transmission and reception of the information signal

answer is B, C, D.

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Detailed Solution

Low frequencies cannot be transmitted to long distances.

Therefore, they are super imposed on a high frequency carrier signal by a process known as modulation.

Speed of electro-magnetic waves will not change due to modulation. So there will be time lag between transmission and reception of the information signal.

Modulation is required to reduce the fractional band with, that is, the ratio of the signal band width to the centre frequency.

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