Communication Systems - ECE Questions and Answers

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The use of Pre-emphasis & de-emphasis in an FM system improves the noise performance over

The entire frequency range

Lower frequency range

Higher frequency range

Medium frequency range

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In communication system, Noise is most likely to affect the signal at

At the transmitter

In the channel

In the information source

At the destination

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Noise figure of merit is unity for ______

PCM

SSB-SC

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Entropy gives __________

Amount of information

Rate of information

Measure of uncertainity

Probability of message

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The information rate is defined to be_________

Average num of bits of information/sec

Average information per message interval

Total num of bits/sec

None of the above

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The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

To help the image frequency rejection

To permit easier tracking

Because otherwise an intermediate frequency could not be produced

To all adequate frequency coverage without switching

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In a Commercial FM Broadcasting, the maximum frequency deviation is _______

75 KHz

200 KHz

5 KHz

15 KHz

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Time division multiplexing is superior to Frequency division multiplexing because

Interchannel cross talk is avoided

Circuitary required is digital

Noise is absent

Bandwidth requirement is reduced

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In a Wide band FM system, the output signal to noise ratio increases

Linearly as the bandwidth

As the square root of the bandwidth

As the square of the bandwidth

As the cube of the bandwidth