# Digital Electronics - Digital Arithmetic Operations and Circuits

### Exercise :: Digital Arithmetic Operations and Circuits - General Questions

21.

If [A] = 1011 1010, [B] = 0011 0110, and [C] = [A] • [B], what is [C 4..2] in decimal?

 A. 1 B. 2 C. 3 D. 4

Explanation:

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22.

 A. requires 16 adders. B. requires 4 adders. C. requires the carry-out of the less significant adder to be connected to the carry-in of the next significant adder. D. requires 4 adders and the connection of the carry out of the less significant adder to the carry-in of the next significant adder.

Explanation:

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23.

When performing subtraction by addition in the 2's-complement system:

 A. the minuend and the subtrahend are both changed to the 2's-complement. B. the minuend is changed to 2's-complement and the subtrahend is left in its original form. C. the minuend is left in its original form and the subtrahend is changed to its 2's-complement. D. the minuend and subtrahend are both left in their original form.

Explanation:

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24.

The two's-complement system is to be used to add the signed numbers 11110010 and 11110011. Determine, in decimal, the sign and value of each number and their sum.

 A. –14 and –13, –27 B. –113 and –114, 227 C. –27 and –13, 40 D. –11 and –16, –27

Explanation:

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25.

When 1100010 is divided by 0101, what is the decimal remainder?

 A. 2 B. 3 C. 4 D. 6