16. A NAND gate is equivalent to an AND gate plus a ……….. gate put together.

(a) NOR

(b) NOT

(c) XOR

(d) XNOR

17. From a four-input OR gate the number of input condition, that will produce HIGH output are :

(a) 0

(b) 1

(c) 3

(d) 15

18. Which of the following combinations of gates cannot implement all Boolean functions ?

(a) AND, OR, NOT

(b) NAND

(c) NOR

(d) XOR

19. A buffer is :

(a) Always non-inverting

(b) Always inverting

(c) Inverting or non-inverting

(d) None of above

20. To implement Y = ABCD using only two-input NAND gates, minimum number of requirement of gate is :

(a) 3

(b) 4

(c) 5

(d) 6

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