Classical

Digital Logic - Combinational Circuits

16:   A one-to-four line demultiplexer is to be implemented using a memory. How many bits must each word have ?
A. 1 bit
B. 2 bits
C. 4 bits
D. 8 bits
 
 

Option: A

Explanation :


17:   What logic function is produced by adding an inverter to the output of an AND gate ?
A. NAND
B. NOR
C. XOR
D. OR
 
 

Option: A

Explanation :


18:   Which of the following gates is known as coincidence detector ?
A. AND gate
B. OR gate
C. NOT gate
D. NAND gate
 
 

Option: A

Explanation :


19:   Which table shows the logical state of a digital circuit output for every possible combination of logical states in the inputs ?
A. Function table
B. Truth table
C. Routing table
D. ASCII table
 
 

Option: B

Explanation :


20:  

A positive AND gate is also a negative

A.

NAND gate

B.

NOR gate

C.

AND gate

D.

OR gate

 
 

Option: D

Explanation :

Truth Table For AND 

0 0 => 0
0 1 => 0
1 0 => 0
1 1 => 1

Now invert all values (as if you place inverters on the two inputs and the one output):

1 1 => 1
1 0 => 1
0 1 => 1
0 0 => 0




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