# Digital Logic - Combinational Circuits

6:   Odd parity of word can beconveniently tested by
 A. OR gate B. AND gate C. NOR gate D. XOR gate Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. prathap said: (7:03am on Friday 24th November 2017) truth table of XOR gate isx | y | Z0 | 0 | 00 | 1 | 11 | 0 | 11 | 1 | 1so when we observe the truth table the output is result to 1 only when there are odd number of 1's in input so we can call xor can be conveniently used to test odd parity word Write your comments here:
7:

Identify the logic function performed by the circuit shown in the given figure

 A. Exclusive OR B. Exclusive NOR C. NAND D. NOR Answer Report Discuss Option: B Explanation : Click on Discuss to view users comments. pankaj sharma said: (4:13pm on Thursday 6th June 2013) the answer will be exclusive nor..output will be xy x'y' Write your comments here:
8:   Which one of the following will give the sum of full adders as output ?
 A. Three point majority circuit B. Three bit parity checker C. Three bit comparator D. Three bit counter Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:
9:

The number of full and half-adders required to add 16-bit numbers is

 A. 8 half-adders, 8 full-adders B. 1 half-adder, 15 full-adders C. 16 half-adders, 0 full-adders D. 4 half-adders, 12 full-adders Answer Report Discuss Option: B Explanation : The one half-adder can add the least significant bit of the two numbers. Full adders are required to add the remaining 15 bits as they all involve adding carries. Click on Discuss to view users comments. Write your comments here:
10:   The time required for a pulse to decrease from 90 to 10 per cent of its maximum value is called
 A. Rise time B. Decay time C. Binary level transition period D. Propagation delay Answer Report Discuss Option: B Explanation : Click on Discuss to view users comments. Write your comments here:

Syllabus covered in this section is-

• Logic functions, Minimization,
• Design and synthesis of combinational and sequential circuits
• Number representation and computer arithmetic (fixed and floating point)
• Propositional (Boolean) Logic
• Satisfiability and Tautology
• Logic Families: TTL, ECL and C-MOS gates.
• Boolean algebra and Minimization of Boolean functions
• Flip-flops-types, race condition and comparison.
• Design of combinational and sequential Circuits
• Representation of Integers: Octal, Hex. Decimal and Binary.
•  2's complement and 1 's complement arithmetic
• Floating point representation.

This Section covers Digital Logic Questions Answers .

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