Computer System Architecture

301. Which code the decimal digits are represented by the 8421 BCD code preceded by 1111:

1. ASCII
2. EBCDIC
3. Both
4. None of these

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302. ____________ has the property that corrupting or garbling a code word will likely produce a bit string that is not a code word:

1. Error deleting codes
2. Error detecting codes
3. Error string codes
4. None of these

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303. Which is method used most simple and commonly:

1. Parity check method
2. Error detecting method
3. Both
4. None of these

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304. Which is the method of parity:

1. Even parity method
2. Odd parity method
3. Both
4. None of these

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305. The ability of a code to detect single errors can be stated in term of the ____________:

1. Concept of distance
2. Even parity
3. Odd parity
4. None of these

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306. The first n bit of a code word called ____________ may be any of the 2n n- bit string minimum error bit:

1. Information bits
2. String bits
3. Error bits
4. All of these

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307. A code in which the total number of 1s in a valid (n+1) bit code word is even, this is called an ____________:

1. Even parity code
2. Odd parity code
3. Both
4. None of these

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308. A code in which the total number of 1s in a valid (n+1)bit code word is odd and this code is called an ____________:

1. Error detecting code
2. Even parity code
3. Odd parity code
4. None of these

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309. a code is simply a subset of the vertices of the ____________:

1. n bit
2. n cube
3. n single
4. n double

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310. Which method is used to detect double errors and pinpoint erroneous bits:

1. Even parity method
2. Odd parity method
3. Check sum method
4. All of these

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