Logic Gates – 1 – 6

26. A NAND gate has :

(a) LOW inputs and a HIGH output
(b) LOW inputs and a LOW output
(c) HIGH inputs and a HIGH output
(d) None of the these

ANSWER

EXPLANATION

27. The basic logic gate whose output is the complement of the input is the :

(a) OR gate
(b) AND gate
(c) INVERTER gate
(d) None of these

ANSWER

EXPLANATION

28. What input values will cause an AND logic gate to produce a HIGH output ?

(a) All inputs are LOW.
(b) At least one input is LOW.
(c) All inputs are HIGH.
(d) At least one input is HIGH.

ANSWER

EXPLANATION

29. How many NAND circuits are contained in a 7400 NAND IC ?

(a) 1
(b) 2
(c) 3
(d) 4

ANSWER

EXPLANATION

30. Exclusive-OR (XOR) logic gates can be constructed from what other logic gates ?

(a) OR gates only
(b) OR gates and NOT gates
(c) AND gates and NOT gates
(d) AND gates, OR gates, and NOT gates

ANSWER

EXPLANATION

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