# Logic Gates – 1 – 4

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

(a) NOR
(b) NOT
(c) XOR
(d)
XNOR

EXPLANATION
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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

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

(a) AND, OR, NOT
(b) NAND
(c) NOR
(d)
XOR

EXPLANATION
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19. A buffer is :

(a) Always non-inverting
(b) Always inverting
(c) Inverting or non-inverting
(d) None of above

EXPLANATION
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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

EXPLANATION
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