Error Detection and Correction Questions

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11.

The ________ between two words is the number of differences between corresponding bits

A

Hamming code

B

Hamming distance

C

Hamming rule

D

none of the above

Correct Answer: B

None.

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12.

To guarantee the detection of up to 5 errors in all cases, the minimum Hamming distance in a block code must be _______

A

5

B

6

C

11

D

none of the above

Correct Answer: B

None.

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13.

To guarantee correction of up to 5 errors in all cases, the minimum Hamming distance in a block code must be ________

A

5

B

6

C

11

D

none of the above

Correct Answer: C

None.

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14.

In a linear block code, the _______ of any two valid codewords creates another valid codeword

A

XORing

B

ORing

C

ANDing

D

none of the above

Correct Answer: A

None.

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15.

A simple parity-check code can detect __________ errors

A

an even-number of

B

two

C

no errors

D

an odd-number of

Correct Answer: D

None.

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16.

_______codes are special linear block codes with one extra property. If a codeword is rotated, the result is another codeword

A

Non-linear

B

Convolution

C

Cyclic

D

none of the above

Correct Answer: C

None.

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17.

. In modulo-11 arithmetic, we use only the integers in the range ______, inclusive

A

1 to 10

B

1 to 11

C

0 to 10

D

none of the above

Correct Answer: C

None.

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18.

In modulo-2 arithmetic, we use only ______

A

1 and 2

B

0 and 2

C

0 and 1

D

none of the above

Correct Answer: C

None.

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19.

Adding 1 and 1 in modulo-2 arithmetic results in _________

A

1

B

2

D

none of the above

Correct Answer: C

None.

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20.

In block coding, if k =2 and n =3, we have _______ invalid codewords

A

8

B

4

C

2

D

none of the above

Correct Answer: B

None.

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