1. The Boolean equation X=[(A + B’) (B+C)] B can be simplified to ?

X=A’B

X= AB’

X= AB

X=A’B’

Answer: X= AB

Explanation:


2. The correct expression is ?

AB+AB AB(A + B)

AB+ AB= AB(A + B)

AB+ AB=AB(A + B)

AB+ AB=AB(A + B)

Answer: AB+AB AB(A + B)

Explanation:


3. The simplified form of a logic function Y =[(AB’)’. (A’B)’]’ is ?

A + B

AB

A + B

AB+ AB

Answer: AB+ AB

Explanation:


4. The logical expression y= A + A’B is equivalent to ?

y= AB

y= A’B

y= A’ + B

y = A+B

Answer: y = A+B

Explanation:


5. Which one of the following statements is correct ?

Static 1 hazard may occur in a 2-level AND-OR gate network

Static O hazard may occur in a 2-level AND-OR gate network

Dynamic hazard may occur in a 2-level OR-AND gate network

Essential hazards may occur in a combinational logic circuit

Answer: Essential hazards may occur in a combinational logic circuit

Explanation:


6. An XOR gate produces output only when two inputs are ?

high

low

different

equal

Answer: different

Explanation:


7. NAND operation with x and y inputs is ?

(x+y)’

x’+y’

x’y’

(x’+y’)(x+y)

Answer: x’+y’

Explanation:


8. The complete set of only those Logic Gates designated as Universal Gates is ?

NOT, OR and AND Gates

XNOR, NOR and NAND Gates

NOR and NAND Gates

XOR, NOR and NAND Gates

Answer: NOR and NAND Gates

Explanation:


9. When one input of an EX-OR gate is connected to logic 1. it functions as ?

NOT gate

OR gate

EX-OR gate

NOR gate

Answer: NOT gate

Explanation:


10. The output of a logic gate is '1' when all its inputs are at logic "0". Then the gate is either ?

a NAND or an EX-OR gate

a NOR or an EX-NOR gate

an OR or an EX-NOR gate

an AND or an EX-OR gate

Answer: a NOR or an EX-NOR gate

Explanation: