Classical

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

 
 

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'.

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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
 
 

Option: C

Explanation :

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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
 
 

Option: D

Explanation :

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29:  

A toggle operation cannot be performed using a single

A.

NOR gate

B.

AND gate

C.

NAND gate

D.

XOR gate

 
 

Option: B

Explanation :

For XOR gate complements the sinlge  input eg if input  1 is given then you get 1 in output and vice versa This is called toggling.
 
Nand and NOR  are universal gates and can be used to design XOR gate so they can also perform toggle operation.
Therefore correct answer is AND gate.

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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
 
 

Option: A

Explanation :

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