Digital Computer Electronics – Section 2

11. The 2’s complement of binary number 010111.1100 is

A. 101001.1100
B. 101000.0100
C. 010111.0011
D. 101000.0011
E. None of the above

Correct Answer:  B. 101000.0100

12. In boolean algebra, the times sign stands for the _____ operation

A. AND
B. OR
C. NAND
D. NOR
E. None of the above

Correct Answer:  A. AND

13. What logic function is obtained by adding an inverter to the output of an AND gate?

A. OR
B. NAND
C. XOR
D. NOR
E. None of the above

Correct Answer:  B. NAND

14. Conversion of an octal number 74328 to a binary number is

A. 11110001101112
B. 1111000110102
C. 1100110101112
D. 1111111110002
E. None of the above

Correct Answer:  B. 1111000110102

15. Conversion of an octal number 1438 to hexadecimal number is

A. 6316
B. 6016
C. 5016
D. 5716
E. None of the above

Correct Answer:  A. 6316

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