WDC Quiz

Which waveforms are also called as line codes?

• PCM

• PAM

• FM

• AM

. Examples of PCM waveforms are

• Non return to zero

• Phase encoded

• Multilevel binary

• All of the mentioned

The return to zero waveform consists of

• Unipolar RZ

• Bipolar RZ

• RZ-AMI

• All of the mentioned

In which waveform logic 1 is represented by half bit wide pulse and logic 0 is represented by absence of pulse?

• Unipolar RZ

• Bipolar RZ

• RZ-AMI

• Manchester coding

In which waveform logic 1 and logic 0 are represented by opposite one half bit wide pulses?

• Unipolar RZ

• Bipolar RZ

• RZ-AMI

• Manchester coding

In which waveform logic 1 is represented by equal amplitude alternating pulses?

• Unipolar RZ

• Bipolar RZ

• RZ-AMI

• Manchester coding

The method in which the tail of one pulse smears into adjacent symbol interval is called as

• Intersymbol interference

• Interbit interference

• Interchannel interference

• None of the mentioned

If each pulse of the sequence to be detected is in _____ shape, the pulse can be detected without ISI.

• Sine

• Cosine

• Sinc

• None of the mentioned

The minimum nyquist bandwidth for the rectangular spectrum in raised cosine filter is

• 2T

• 1/2T

• T2

• 2/T

Roll off factor is the fraction of

• Excess bandwidth and absolute bandwidth

• Excess bandwidth and minimum nyquist bandwidth

• Absolute bandwidth and minimum nyquist bandwidth

• None of the mentioned