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Digital Arithmetic Operations and Circuits (Digital Electronics) Question and Answers-Page first

# Digital Arithmetic Operations and Circuits problems

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• 1. What logic function is the sum output of a half-adder?

• Options
• A. AND
• B. exclusive-OR
• C. exclusive-NOR
• D. NAND

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• 2. Solve this binary problem: 01110010 ? 01001000 =

• Options
• A. 00011010
• B. 00101010
• C. 01110010
• D. 00111100

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• 3. Solving ?11 + (?2) will yield which two's-complement answer?

• Options
• A. 1110 1101
• B. 1111 1001
• C. 1111 0011
• D. 1110 1001

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• 4. Perform subtraction on each of the following binary numbers by taking the two's-complement of the number being subtracted and then adding it to the first number.
01001        01100
00011        00111

• Options
• A. 01100    10011
• B. 00110    00101
• C. 10110    10101
• D. 00111    00100

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• 5. Which of the following is the primary advantage of using binary-coded decimal (BCD) instead of straight binary coding?

• Options
• A. Fewer bits are required to represent a decimal number with the BCD code.
• B. BCD codes are easily converted from decimal.
• C. the relative ease of converting to and from decimal
• D. BCD codes are easily converted to straight binary codes.

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• 6. A half-adder circuit would normally be used each time a carry input is required in an added circuit.

• Options
• A. True
• B. False

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• Options
• A. determine sign and magnitude
• B. reduce propagation delay
• C. add a 1 to complemented inputs
• D. increase ripple delay

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• 8. Solve the following: • Options
• A. 10011110
• B. 01211110
• C. 000100000100
• D. 001000001000

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• 9. Solve this binary problem: 01000110 ÷ 00001010 =

• Options
• A. 0111
• B. 10011
• C. 1001
• D. 0011

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• 10. One way to make a four-bit adder perform subtraction is by:

• Options
• A. inverting the output.
• B. inverting the carry-in.
• C. inverting the B inputs.
• D. grounding the B inputs.

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