Logic Gates – 1 – 2

6. Which of the Boolean expression correctly represents the relation between P,Q,R and M ?

Mcq series

(a) M = (P OR Q) XOR R
(b) M = (P AND Q) XOR R
(c) M = (P NOR Q) XOR R
(d) M = (P XOR Q) XOR R

ANSWER

EXPLANATION

7. A lamp is controlled from two position A and B (e.g., stair case circuit). The Boolean expression for the above circuit is :

(a) AB’+A’B
(b) AB+A’B’
(c) A’B+A’B’
(d) AB’+AB

ANSWER

EXPLANATION

8. In all NAND combination circuit realization all ODD number of gates behave like :

(a) NAND gates
(b) AND gates
(c) OR gates
(d) None of these

ANSWER

EXPLANATION

9. If the negative logic is used, the diode gate in the circuit below represents an :
Mcq series

(a) OR gate
(b) AND gate
(c) NOR gate
(d) NAND gate

ANSWER

EXPLANATION

10. A NAND gate is called a universal logic element because :

(a) It is used by everybody
(b) Any logic function can be realized by NAND gates alone
(c) All the minization techniques are applicable for optimum NAND gate realization
(d) 
Many digital computers use NAND gates

ANSWER

EXPLANATION

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