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Comments
Question
In which of the following adder circuits, the carry look ripple delay is eliminated?
Options
A. Half adder
B. Full adder
C. Parallel adder
D. Carry-look-ahead adder
E. None of the above
Correct Answer
Carry-look-ahead adder
Digital Computer Electronics problems
Search Results
1. What is the 1's complement of 0000 1111 0010 1101 number?
Options
A. 1111 0000 0010 1101
B. 1111 0000 1101 0010
C. 1111 1100 1010 1100
D. 1001 0010 1010 1100
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 1111 0000 1101 0010
2. Conversion of an octal number 136
8
to hexadecimal number is
Options
A. 7E
16
B. 5E
16
C. 5A
16
D. 5D
16
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 5E
16
3. The m-bit parallel adder consists of:
Options
A. (m+1) full adders
B. m/2 full adders
C. m-1 full adders
D. m full adders
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: m full adders
4. The maximum count which a 6-bit binary word can represent is
Options
A. 36
B. 64
C. 63
D. 65
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 63
5. Addition of 1101
2
and 1010
2
is
Options
A. 10101
2
B. 11000
2
C. 11011
2
D. 10111
2
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 10111
2
6. Conversion of an octal number 7432
8
to a binary number is
Options
A. 1111000110111
2
B. 111100011010
2
C. 110011010111
2
D. 111111111000
2
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 111100011010
2
7. A NAND gate is equivalent to an AND gate followed by an inverter. All inputs must be _____ to get a low output
Options
A. low
B. high
C. some low and some high
D. 0's
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: high
8. An OR gate has 6 inputs. How many input words are in its truth table?
Options
A. 64
B. 32
C. 16
D. 128
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 64
9. What logic function is produced by adding an inverter to the output of an AND gate?
Options
A. NAND
B. NOR
C. XOR
D. OR
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: NAND
10. Conversion of an octal number 143
8
to hexadecimal number is
Options
A. 63
16
B. 60
16
C. 50
16
D. 57
16
E. None of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 63
16
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