# Digital Logic - Combinational Circuits

26:

The digital multiplexer is basically a combination logic circuit to perform the operation

 A. AND-AND B. OR-OR C. AND-OR D. OR-AND Answer Report Discuss Option: C Explanation : The equation for digital multiplexer includes AND and OR operations . For example AB+CD. So here firstly we have to solve AND operation then OR operation. Option is 'C'. Click on Discuss to view users comments. Write your comments here:
27:   The output of NOR gate is
 A. High if all of its inputs are high B. Low if all of its inputs are low C. High if all of its inputs are low D. High if only of its inputs is low Answer Report Discuss Option: C Explanation : Click on Discuss to view users comments. Write your comments here:
28:   How many lines the truth table for a four-input NOR gate would contain to cover all possible input combinations ?
 A. 4 B. 8 C. 12 D. 16 Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:
29:   A toggle operation cannot be performed using a single
 A. NOR gate B. AND gate C. NAND gate D. XOR gate Answer Report Discuss Option: B Explanation : Click on Discuss to view users comments. Write your comments here:
30:   Which table shows the electrical state of a digital circuit's output for every possible combination of electrical states in the inputs ?
 A. Function table B. Truth table C. Routing table D. ASCII table Answer Report Discuss Option: A Explanation : Click on Discuss to view users comments. Write your comments here: '>

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