Digital Communication Encoding Quiz

In NRZ encoding, the signal:

• Changes to zero during the bit period.

• Stays at a constant level during the bit period.

• Alternates between high and low.

• Fluctuates up and down during the bit period.

In RZ encoding, the signal:

• Stays high for the entire bit period.

• Returns to zero halfway through the bit period.

• Always stays low.

• Does not return to zero.

What is one disadvantage of NRZ encoding?

• It is easy to synchronize.

• It can be hard to detect the signal if there are long sequences of 1s or 0s.

• It always changes direction.

• It requires no bandwidth.

Which of the following encoding schemes has a signal that returns to zero during the bit period?

• NRZ

• RZ

• Manchester

• Bipolar

Which of the following is true for NRZ encoding?

• The signal does not return to zero.

• The signal fluctuates between high and low during the bit period.

• The signal alternates between 1 and 0 every half bit period.

• The signal always stays at zero.

In NRZ encoding, a '1' is represented by:

• A high voltage throughout the bit period.

• A low voltage throughout the bit period.

• A high voltage for half the bit period, then low.

• A high voltage for half the bit period, then returns to zero.

In RZ encoding, a '1' is represented by:

• A low voltage for the entire bit period.

• A high voltage for the first half, then a zero voltage.

• A high voltage for the entire bit period.

• A low voltage for half the bit period.

What is the main purpose of line coding in digital communication?

• To convert analog signals into digital signals

• To represent digital data in a form suitable for transmission over a communication medium

• To reduce the data transmission rate

• To filter high-frequency noise from the signal

Which of the following is true for Unipolar line coding?

• It uses positive, zero, and negative voltage levels.

• It uses only one voltage level, typically positive.

• It uses two voltage levels, positive and negative.

• The signal alternates between positive and zero voltage levels.

Return to Zero (RZ) encoding requires which of the following?

• A transition at the middle of each bit period.

• A constant voltage for each bit.

• A zero voltage for the entire bit period.

• A return to zero before the end of each bit period.