AE & JE EE Quiz Communication Systems Complete Revision

Which of the following techniques is different from others?

A signal is composed of a fundamental frequency of 2 kHz and another of 4 kHz. This 4 kHz signal is referred to as

In AM, if modulation index is more than 100%, then

The input to a coherent detector is DSB-SC signal plus noise. The noise at the detector output is:

Light is confined within the core of a simple optical fibre by____.

The disadvantage of CDMA system is:

If 90 KHz carrier is amplitude modulated by the speech band of 200 Hz to 2 kHz, then the range of upper and lower side bands will respectively be:

Theoretical bandwidth requirement for FM system is:

In radar systems PRF stands for

An FM wave uses a 25 V, 500 Hz modulating frequency and has a modulation index of 50. The deviation is