Error Correction and detection

1. How error detection and correction is done?

• By passing it through equalizer

• By passing it through filter

• By amplifying it

• By adding redundancy bits

2. Which error detection method is more efficient?

• Parity check

• Cyclic redundancy check

• Parity & Cyclic redundancy check

• Hamming code

3. Which error detection method uses one’s complement?

• Simple parity check

• Two dimensional parity check

• CRC

• Checksum

4. The checksum of 1111 and 1111 is ----------

• 1110

• 0000

• 1111

• 0111

5. How many bits in the data unit has changed in a single bit error

• 1 bit

• 2 bits

• 3 bits

• 4 bits

6. A ------------- error means that two or more bits in the data unit has changed.

• Burst

• Double bit

• Single bit

• Checksum

7. In ------------- error correction the receiver corrects the error without requesting retransmission

• Onward

• Forward

• Backward

• Retransmission

8. In ------------- error correction the receiver asks the sender to send the data again

• Forward

• Backward

• Outward

• Retransmission

9. The ---------- of error is more difficult than --------

• Detection, Correction

• Correction, Convolution

• Correction, Detection

• Convolution, Detection

10. The divisor in the cyclic code is normally called

• Redundancy

• Degree

• Generator

• Monitor