Digital Communication Online Test 1 (Free)

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Your Name

1 / 10

How many transitions can we make at every bit of time?

One

Two

Three

Half

2 / 10

Compression in PCM refers to relative compression of

Higher signal frequencies

Lower signal frequencies

Lower signal amplitudes

Higher signal amplitudes

3 / 10

The noise variance for AWGN is:

2N0

N0/4

N0/2

4 / 10

The process of conversion of data along with its formatting is called:

Source Coding

Amplifying

Formatting

Modulation

5 / 10

The line code that has zero dc component for pulse transmission of random binary data is

Non-return to zero (NRZ)

Alternate mark inversion (AMI)

Return to zero (RZ)

None of the above

6 / 10

Flat top sampling of low pass signals

Introducing delay distortion

Leads to aliasing

Implies oversampling

Gives rise to aperture effect

7 / 10

Companding in PCM systems lead to improved signal to quantization noise ratio. This improvement is for

Higher amplitudes only

Lower amplitudes only

Higher frequency components only

Lower frequency components only

8 / 10

Increased pulse width in the flat top sampling, leads to

No harmful effects in reproduction

Greater aliasing errors in reproduction.

Attenuation of low frequencies in reproduction

Attenuation of high frequencies in reproduction

9 / 10

In delta modulation, the slope overload distortion can be reduced by

Increasing the step size

Decreasing the sampling rate

Decreasing the granular noise

Decreasing the step size

10 / 10

Which of the following is a fully digital cordless system?

DECT

CT1+

CT1

CT0

Your score is

The average score is 70%

User Name	Score
Asdf	40%
Chetan Vaghela	100%

Digital Communication Online Test 1 (Free)

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