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# Digital Logic - Combinational Circuits

11:   Which of the following gates would output 1 when one input is 1 and other input is 0 ?
 A. OR gate B. AND gate C. NAND gate D. both (a) and (c) Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:
12:   Which of the following statements is wrong ?
 A. Propagation delay is the time required for a gate to change its state B. Noise immunity is the amount of noise which can be applied to the input of a gate without causing the gate to change state C. Fan-in of a gate is always equal to fan-out of the same gate D. Operating speed is the maximum frequency at which digital data can be applied to a gate Answer Report Discuss Option: C Explanation : Click on Discuss to view users comments. Write your comments here:
13:

Which of the following expressions is not equivalent to X ' ?

 A. X NAND X B. X NOR X C. X NAND 1 D. X NOR 1 Answer Report Discuss Option: D Explanation : Answer is C as  if X= 0  then X NAND 1 = 1 = X ' if X=1 then X NAND 1= 0=  X' In Option (d) if  X= 0 then X NOR 0 = 1 = X' if X=1 then X NOR 1= 0 <> X'  Click on Discuss to view users comments. Ahmad said: (3:28am on Wednesday 18th January 2017) what about A?if X= 0 then X(0) NAND X(0) = 1 = X 'if X=1 then X(1) NAND X(1) = 0= X' Arghyadeep Sen said: (9:15pm on Monday 12th March 2018) Question was about "not equivalent to" Write your comments here:
14:   Which of the following gates are added to the inputs of the OR gate to convert it to the NAND gate ?
 A. NOT B. AND C. OR D. XOR Answer Report Discuss Option: A Explanation : Click on Discuss to view users comments. mahmoud said: (6:46am on Thursday 5th April 2018) NOR gate***?! Write your comments here:
15:   The EXCLUSIVE NOR gate is equivalent to which gate followed by an inverter ?
 A. OR B. AND C. NAND D. XOR Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here: X