# MCQ IN COMPUTER SCIENCE & ENGINEERING

## COMPUTER SCIENCE AND ENGINEERING

### DIGITAL LOGIC

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The Boolean expression for a 3-input AND gate is ____
 A A )X = AB B B) X = ABC C C) X = A + B + C D D) X = AB + C
Explanation:

Detailed explanation-1: -Detailed Solution. A . B. C = D is the expression for three input AND gate.

Detailed explanation-2: -y = a’bc’ + ab’c’ + ab’c The combinational circuit constructed from these two equations is shown in (a) of Figure 1.4(f). . Each 3-variable AND term is replaced by a 3-input AND gate.

Detailed explanation-3: -3 input NAND Gate The Boolean expression of the logic NAND gate is represented as the binary operation dot(.). Where A, B, and C are the inputs and Y is the output.

Detailed explanation-4: -Sometimes you need to AND more than two inputs together. In fact, 3-and 4-input AND gates are just as common as the dual-input variety.

Detailed explanation-5: -Solution : ‘bar((A+B))*bar((A*B))=1‘ <br> Now ‘bar((0+0))*bar((0+0))=1*1=1‘ <br> Thus, both inputs A and B should be zero. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

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