Computer Organization

Fast Adders

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The usual implementation of the carry circuit involves _________
And & or gates
XOR
NAND
XNOR
Explanation:
In case of full and half adders this method is used.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
The logic operations are implemented using _______ circuits.
Bridge
Logical
Combinatorial
Gate
Explanation:
The combinatorial circuits means, using the basic universal gates.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
A _______ gate is used to detect the occurrence of an overflow.
NAND
XOR
XNOR
AND
Explanation:
The overflow is detected by cn^cn-1 (‘^’ indicates XOR operation).
Question 4
Marks : +2 | -2
Pass Ratio : 100%
In full adders the sum circuit is implemented using ________
And & or gates
NAND gate
XOR
XNOR
Explanation:
sum = a ^ b ^ c (‘^’ indicates XOR operation).
Question 5
Marks : +2 | -2
Pass Ratio : 100%
In a normal adder circuit, the delay obtained in a generation of the output is _______
2n + 2
2n
n + 2
None of the mentioned
Explanation:
The 2n delay cause of the carry generation and the 2 delay cause of the XOR operation.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which option is true regarding the carry in the ripple adders?
Are generated at the beginning only
Must travel through the configuration
Is generated at the end of each operation
None of the mentioned
Explanation:
The carry must pass through the configuration of the circuit till it reaches the particular step.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
The delay reduced to in the carry look ahead adder is __________
5
8
10
2n
Explanation:
None.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The final addition sum of the numbers, 0110 & 0110 is ____________
1101
1111
1001
1010
Explanation:
None.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
The carry generation function: ci + 1 = yici + xici + xiyi, is implemented in ____________
Half adders
Full adders
Ripple adders
Fast adders
Explanation:
In this the carry for the next step is generated in the previous steps operation.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The logic operations are simpler to implement using logic circuits.
True
False
Explanation:
The logic operation includes AND, OR, XOR etc.