# Digital Electronics - Digital Arithmetic Operations and Circuits

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

6.

Add the following BCD numbers.
 0110 0111 1001 0101 1000 1000

 A. 0000  1011    0000  1111    0001  0001 B. 0001  0001    0001  0101    0001  0001 C. 0000  1011    0000  1111    0001  0111 D. 0001  0001    0001  0101    0001  0111

Answer: Option D

Explanation:

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7.

Add the following hexadecimal numbers.
 3C 14 3B +25 +28 +DC

 A. 60    3C    116 B. 62    3C    118 C. 61    3C    117 D. 61    3D    117

Answer: Option C

Explanation:

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8.

Solve this BCD problem: 0100 + 0110 =

 A. 00010000BCD B. 00010111BCD C. 00001011BCD D. 00010011BCD

Answer: Option A

Explanation:

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9.

What are constants in VHDL code?

 A. Fixed numbers represented by a name B. Fixed variables used in functions C. Fixed number types D. Constants do not exist in VHDL code.

Answer: Option A

Explanation:

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10.

The 2's-complement system is to be used to add the signed binary numbers 11110010 and 11110011. Determine, in decimal, the sign and value of each number and their sum.

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

Answer: Option B

Explanation:

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